HP 6600/HSR6600 Routers

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1 HP 6600/HSR6600 Routers Interface Configuration Guide Part number: Software version: A6602-CMW520-R3103 A6600-CMW520-R3102-RPE A6600-CMW520-R3102-RSE HSR6602_MCP-CMW520-R3102 Document version: 6PW

2 Legal and notice information Copyright 2013 Hewlett-Packard Development Company, L.P. No part of this documentation may be reproduced or transmitted in any form or by any means without prior written consent of Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. HEWLETT-PACKARD COMPANY MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.

3 Contents Configuring Ethernet interfaces 1 Overview 1 Performing general configurations 1 Configuring a combo interface 1 Configuring the operating mode for a 10-GE interface 2 Configuring basic settings of an Ethernet interface or subinterface 3 Shutting down an Ethernet interface or subinterface 4 Configuring physical state change suppression on an Ethernet interface 5 Configuring loopback testing on an Ethernet interface 5 Configuring the link mode of an Ethernet interface 6 Setting a statistics polling interval 7 Enabling subinterface rate statistics collection on an Ethernet interface 7 Configuring a Layer 2 Ethernet interface 8 Layer 2 Ethernet interface configuration task list 8 Configuring a port group 8 Setting speed options for auto negotiation on an Ethernet interface 9 Configuring storm suppression 10 Configuring jumbo frame support 11 Enabling loopback detection on an Ethernet interface 11 Setting the MDI mode of an Ethernet interface 14 Testing the cable connection of an Ethernet interface 14 Configuring storm control on an Ethernet interface 15 Configuring a Layer 3 Ethernet interface or subinterface 16 Layer 3 Ethernet interface configuration task list 16 Setting the MTU for an Ethernet interface or subinterface 17 Configuring an Ethernet interface to operate in promiscuous mode 17 Displaying and maintaining an Ethernet interface or subinterface 17 Configuring ATM interfaces 19 ATM interface 19 ATM 19 ATM interfaces available on the 6600 and HSR6600 routers 19 ATM interface features 19 IMA 20 Configuring an ATM E1/T1 interface 20 Troubleshooting ATM E1/T1 interfaces 21 Configuring an ATM OC-3c/STM-1 interface 21 Overview 21 Configuration procedure 21 Displaying and maintaining ATM interfaces 22 Troubleshooting ATM interfaces 22 Configuring WAN interfaces 23 Configuring a synchronous serial interface 23 Enabling subinterface rate statistics collection on a serial interface 25 Displaying and maintaining serial interfaces 25 Configuring a CE1 interface 25 Configuring a CE1 interface in E1 mode 26 Configuring a CE1 interface in CE1 mode 26 Configuring other CE1 interface parameters 27 i

4 Configuring error packets diffusion restraint 28 Displaying and maintaining CE1 interfaces 28 Configuring a CT1 interface 29 Configuring a CT1 interface in CT1 mode 29 Configuring other CT1 interface parameters 29 Starting/terminating a BERT test on a CT1 interface 31 Configuring error packets diffusion restraint 31 Displaying and maintaining CT1 interfaces 32 Configuring an E1-F interface 32 Configuring an E1-F interface in framed mode 32 Configuring an E1-F interface in unframed mode 33 Configuring other E1-F interface parameters 33 Configuring error packets diffusion restraint 34 Displaying and maintaining E1-F interfaces 35 Configuring a T1-F interface 35 Starting/terminating a BERT test on a T1-F interface 37 Configuring error packets diffusion restraint 37 Displaying and maintaining T1-F interfaces 38 Configuring a CE3 interface 38 Configuring a CE3 interface in E3 mode 39 Configuring a CE3 interface in CE3 mode 39 Configuring other CE3 interface parameters 40 Displaying and maintaining CE3 interfaces 41 Configuring a CT3 interface 41 Configuring a CT3 interface in T3 mode 42 Configuring a CT3 interface in CT3 mode 42 Configuring other CT3 interface parameters 43 Displaying and maintaining CT3 interfaces 45 Configuring POS interfaces 47 Overview 47 SONET 47 SDH 47 POS 47 Configuring a POS interface 47 Configuration procedure 47 Enabling sub-interface rate statistics collection for a POS interface 49 Configuring the working mode of a POS interface card 49 Displaying and maintaining POS interfaces 50 POS interface configuration example 50 Directly connecting routers through POS interfaces 50 Connecting routers through POS interfaces across frame relay 51 Troubleshooting POS interfaces 52 Configuring CPOS interfaces 54 Overview 54 SONET/SDH 54 CPOS 54 SDH frame structure 54 Terms 55 Multiplexing E1/T1/E3/T3 channels to form STM-1 55 Calculating E1/T1/E3/T3 channel sequence numbers 57 Overhead bytes 58 CPOS interface application scenario 59 Configuring a CPOS interface 59 ii

5 Configuring an E1 channel 61 Configuring a T1 channel 62 Configuring an E3 channel 63 Configuring a T3 channel 64 Configuring the working mode of an interface card 65 Displaying and maintaining CPOS interfaces 65 CPOS interface configuration examples 66 CPOS-E1 interface configuration example 66 CPOS-E3 configuration example 67 Troubleshooting CPOS interfaces 68 Interface physical status is UP, link protocol status is down, and loopback is detected 68 Configuring E-CPOS interfaces 70 Overview 70 SONET 70 SDH 70 E-CPOS 74 Configuring an E-CPOS interface 75 Configuring an E-CPOS interface 75 Configuring the operating mode of an E-CPOS interface/channel 76 Displaying and maintaining E-CPOS interfaces 79 E-CPOS interface configuration examples 79 E-CPOS interface configuration example 1 79 E-CPOS interface configuration example 2 81 Troubleshooting E-CPOS interfaces 82 Symptom 82 Solution 82 Configuring loopback and null interfaces 85 Configuring a loopback interface 85 Introduction 85 Configuration procedure 85 Configuring the null interface 86 Introduction 86 Configuration procedure 86 Displaying and maintaining loopback and null interfaces 87 Support and other resources 88 Contacting HP 88 Subscription service 88 Related information 88 Documents 88 Websites 88 Conventions 89 Index 91 iii

6 Configuring Ethernet interfaces All configuration tasks in this chapter are independent and optional. You can perform these configuration tasks in any order. Overview Ethernet is the most widespread wired LAN technology due to its flexibility, simplicity, and easy implementation. Your device supports the following types of Ethernet interfaces: Layer 2 Ethernet interfaces Physical Ethernet interfaces operating at the data link layer (Layer 2) to forward traffic within a subnet between hosts. Layer 3 Ethernet interfaces Physical Ethernet interfaces operating at the network layer (Layer 3) to forward traffic between different subnets. You can assign an IP address to a Layer 3 Ethernet interface. Layer-configurable Ethernet interfaces Physical Ethernet interfaces that can be configured to operate in bridge mode as Layer 2 Ethernet interfaces or in route-mode as Layer 3 Ethernet interfaces. Layer 3 Ethernet subinterfaces Logical interfaces operating at the network layer. You can assign an IP address to a Layer 3 Ethernet subinterface. By creating subinterfaces on a Layer 3 Ethernet interface, you enable the interface to carry packets for multiple VLANs. For how a Layer 3 Ethernet subinterface sends and receives VLAN-tagged packets, see Layer 2 LAN Switching Configuration Guide. Performing general configurations This section describes the settings common to Layer 2 and Layer 3 Ethernet interfaces or subinterfaces. For more information about the settings specific to a type of Ethernet interfaces, see "Configuring a Layer 2 Ethernet interface" and "Configuring a Layer 3 Ethernet interface or subinterface." Configuring a combo interface A combo interface is a logical interface that comprises one fiber port and one copper port. The two ports share one forwarding channel and one interface view, so they cannot work simultaneously. When you enable one port, the other port is automatically disabled. The fiber combo port and the copper combo port share one interface view, in which you can activate the fiber or copper combo port, and configure other port attributes such as the interface rate and duplex mode. Configuration prerequisites Before you configure combo interfaces, complete the following tasks: Determine the combo interfaces on your device by checking the product specifications and identify the two physical interfaces that compose each combo interface. 1

7 Use the display interface command to determine whether the fiber port or copper port of the combo interface is active. If the current port is the copper port, the output includes "Media type is twisted pair." If the current port is the fiber port, the output includes "Media type is optical fiber." You can use the display this command in combo interface view to determine whether the fiber port or copper port of the combo interface is active. If the combo enable fiber command exists in the output, the fiber port is active. Otherwise, the copper port is active. Changing the active port of a combo interface 2. Enter Ethernet interface view. 3. Activate the copper combo port or fiber combo port. interface interface-type interface-number combo enable { copper fiber } N/A By default, the copper combo port is active. Configuring the operating mode for a 10-GE interface Introduction to the operating modes A ten-gigabitethernet (10-GE) interface operates in LAN or WAN mode, as follows: LAN mode In LAN mode, the 10-GE interface transmits Ethernet packets, providing access to an Ethernet network. WAN mode In WAN mode, the 10-GE interface transmits SDH packets, providing access to an SDH network. In this mode, the interface supports only point-to-point connections. A 10-GE interface in WAN mode encapsulates Ethernet packets in SDH frames, and a 10G Packet over SDH (POS) interface encapsulates PPP packets in SDH frames. However, these two types of interfaces cannot communicate with each other, because the framing formats used by them are different. Introduction to J0 and J1 overhead bytes SDH frames have diversified overhead bytes, which accomplish the operation and maintenance functions such as hierarchical management of the transmission network. J0 and J1 are used to provide internetworking support between devices of different countries, regions, or vendors. The regenerator section trace byte J0 is usually set to a section access point identifier. The sending end keeps the connection with the receiving end by sending this byte repeatedly. The path trace byte J1, a byte in the high-order path overhead and usually set to a high-order path access point identifier, functions in a similar way to keep the connection with the receiving end of the path. To ensure smooth communication, the J0 and J1 bytes should be matched at, respectively, the sending and receiving ends. For more information about SDH and SDH overhead bytes, see relevant technical documentation. Configuration procedure To configure a 10-GE interface to operate in LAN or WAN mode: 2

8 2. Enter 10-GE interface view. 3. Configure the 10-GE interface to operate in LAN or WAN mode. 4. Configure the J0 or J1 byte when the 10-GE interface is operating in WAN mode. interface ten-gigabitethernet interface-number port-mode { lan wan } flag { j0 j1 } sdh flag-value N/A By default, a 10-GE interface operates in LAN mode. By default, the value of the J0 and J1 bytes is 0. The flag command is applicable to 10-GE interfaces operating in WAN mode only. Configuring basic settings of an Ethernet interface or subinterface Configuring an Ethernet interface You can set an Ethernet interface to operate in one of these duplex modes: Full-duplex mode (full) Interfaces that operate in this mode can send and receive packets simultaneously. Half-duplex mode (half) Interfaces that operate in this mode cannot send and receive packets simultaneously. Auto-negotiation mode (auto) Interfaces that operate in this mode negotiate a duplex mode with their peers. You can set the speed of an Ethernet interface or enable it to automatically negotiate a speed with its peer. For a 100-Mbps or 1000-Mbps Layer 2 Ethernet interface, you can also set speed options for auto negotiation. The two ends can select a speed only from the available options. For more information, see "Setting speed options for auto negotiation on an Ethernet interface." To configure an Ethernet interface: 2. Enter Ethernet interface view. 3. Set the interface description. interface interface-type interface-number description text N/A By default, the description of an interface is in the format of interface-name Interface. For example, GigabitEthernet 4/0/1 Interface. 3

9 4. Set the duplex mode of the interface. 5. Set the port speed. 6. Set the intended bandwidth for the interface. duplex { auto full half } speed { auto } bandwidth bandwidth-value By default, the duplex mode is full for 10-GE interfaces, and is auto for other Ethernet interfaces. Fiber ports do not support the half keyword. The default setting is auto. Fiber ports do not support the 10 or 100 keyword. Configuring an Ethernet subinterface To configure an Ethernet subinterface: 2. Create an Ethernet subinterface. interface interface-type interface-number.subnumber This command also leads you to Ethernet subinterface view. 3. Set the interface description. description text 4. Restore the default settings for the subinterface. default By default, the description of an Ethernet subinterface is in the format of interface-name Interface. For example, GigabitEthernet1/0/1.1 Interface. You can configure IP- related settings on an Ethernet subinterface. For more information, see Layer 3 IP Services Configuration Guide. To use an Ethernet subinterface to transmit and receive packets, you must associate it with a VLAN. For more information, see Layer 2 LAN Switching Configuration Guide. For the local and remote Ethernet subinterfaces to transmit traffic correctly, assign them to the same VLAN. Shutting down an Ethernet interface or subinterface CAUTION: Use this command with caution. After you manually shut down an Ethernet interface, the Ethernet interface cannot forward packets even if it is physically connected. 4

10 You might need to shut down and then bring up an Ethernet interface or subinterface to activate some configuration changes, for example, the speed or duplex mode changes. To shut down an Ethernet interface or subinterface: 2. Enter Ethernet interface or subinterface view, or port group view. 3. Shut down the Ethernet interface or subinterface. Enter Ethernet interface view: interface interface-type interface-number Enter port group view: port-group manual port-group-name Enter Ethernet subinterface view: interface interface-type interface-number.subnumber shutdown Use one of the commands. To shut down an Ethernet interface or subinterface, enter Ethernet interface or subinterface view. To shut down all Ethernet interfaces in a port group, enter port group view. By default, Ethernet interfaces and subinterfaces are up. Configuring physical state change suppression on an Ethernet interface The physical link state of an Ethernet interface is either up or down. Each time the physical link of a port goes up or comes down, the system immediately reports the change to the upper-layer protocol modules (such as routing and forwarding modules) for packet transmission, and automatically generates traps and logs, informing the user to take corresponding actions. To prevent frequent physical link flapping from affecting system performance, configure physical state change suppression to suppress the reporting of physical link state changes. The system reports physical layer changes only when the suppression interval expires. To configure physical state change suppression on an Ethernet interface: 2. Enter Ethernet interface view. 3. Set a physical state change suppression interval. interface interface-type interface-number link-delay delay-time N/A By default, physical state change suppression is disabled. Configuring loopback testing on an Ethernet interface If an Ethernet interface does not work correctly, you can enable loopback testing on it to identify the problem. An Ethernet interface in a loopback test does not forward data traffic. Loopback testing has the following types: Internal loopback testing Tests all on-chip functions related to Ethernet interfaces. 5

11 External loopback testing Tests hardware of Ethernet interfaces. To perform external loopback testing on an Ethernet interface, connect a loopback plug to the Ethernet interface. The device sends test packets out of the interface, which are expected to loop over the plug and back to the interface. If the interface fails to receive any test packets, the hardware of the interface is faulty. Configuration restrictions and guidelines On an interface that is physically down, you can only perform internal loopback testing. On an interface administratively shut down, you cannot perform internal or external loopback testing. The speed, duplex, mdi, and shutdown commands are not available during loopback testing. During loopback testing, the Ethernet interface operates in full duplex mode. When you disable loopback testing, the port returns to its duplex setting. Configuration procedure To enable loopback testing on an Ethernet interface: 2. Enter Ethernet interface view. interface interface-type interface-number N/A 3. Enable loopback testing. loopback { external internal } By default, loopback testing is disabled. Configuring the link mode of an Ethernet interface This feature is supported on only routers configured with SAP modules. Depending on the hardware structure of interface cards, for a device, some interfaces can operate only as Layer 2 Ethernet interfaces (in bridge mode), some can operate only as Layer 3 Ethernet interfaces (in route mode), but others can operate either as Layer 2 or Layer 3 Ethernet interfaces (you can set the link mode to bridge or route). You can configure the link mode in system view or in Ethernet interface view, which produces the same result. The link mode configuration in system view applies to multiple interfaces, and the link mode configuration in interface view applies only to the current interface. Configuration restrictions and guidelines Before you change the link mode of an Ethernet interface, make sure the other commands have been successfully configured. When the link mode of an Ethernet interface is being changed, you cannot perform any other configuration. After you change the link mode of an Ethernet interface, all settings of the Ethernet interface are restored to their defaults under the new link mode. The link mode configuration for an Ethernet interface in system view and in interface view supersedes each other. You can change the link mode of only the active port of a combo interface. To activate the other port, make sure the active port operates in bridge mode and activate the other port with the undo shutdown command. 6

12 Configuration procedure To change the link mode of the specified Ethernet interfaces in system view: Step Command 1. Enter system view. system-view 2. Change the link mode of the specified Ethernet interfaces. port link-mode { bridge route } interface-list To change the link mode of an Ethernet interface: Step Command 1. Enter system view. system-view 2. Enter Ethernet interface view. interface interface-type interface-number 3. Change the link mode of the Ethernet interface. port link-mode { bridge route } Setting a statistics polling interval You can configure an interface statistics polling interval. To display the interface statistics collected in the last polling interval, use the display interface or display counters rate command. To clear the interface statistics of an interface, use the reset counters interface command. To set the statistics polling interval: 2. Set the statistics polling interval. flow-interval interval The default setting is 300 seconds. When a large amount of logical interfaces are configured on the router, the default setting is recommended. Enabling subinterface rate statistics collection on an Ethernet interface CAUTION: Use this function with caution, because it might consume a large amount of system resources. After you enable subinterface rate statistics collection on an Ethernet interface, the device periodically refreshes the rate statistics on the subinterfaces of this Ethernet interface. You can use the display interface command to view the rate statistics. To enable subinterface rate statistics collection on an Ethernet interface: 7

13 2. Enter Ethernet interface view. 3. Enable subinterface rate statistics collection on the Ethernet interface. interface interface-type interface-number sub-interface rate-statistic N/A By default, subinterface rate statistics collection is disabled. Configuring a Layer 2 Ethernet interface The features in this section are supported on only SAP modules that are operating in bridge mode. Layer 2 Ethernet interface configuration task list You can perform the following configurations on Ethernet interfaces operating in bridge mode. Task Configuring a port group Setting speed options for auto negotiation on an Ethernet interface Configuring storm suppression Configuring jumbo frame support Enabling loopback detection on an Ethernet interface Setting the MDI mode of an Ethernet interface Testing the cable connection of an Ethernet interface Configuring storm control on an Ethernet interface Remarks Applicable to Layer 2 Ethernet interfaces. Applicable to FE or GE Layer 2 Ethernet interfaces. Applicable to Layer 2 Ethernet interfaces. Applicable to Layer 2 Ethernet interfaces. Applicable to Layer 2 Ethernet interfaces. Applicable to Layer 2 Ethernet interfaces. Applicable to Layer 2 Ethernet interfaces. Applicable to Layer 2 Ethernet interfaces. Configuring a port group Some interfaces on your device might use the same set of settings. To configure these interfaces in bulk rather than one by one, you can assign them to a port group. 8

14 You create port groups manually. All settings made for a port group apply to all member ports of the group. For example, you can configure a traffic suppression threshold (see "Configuring storm suppression") for multiple interfaces in bulk by assigning these interfaces to a port group. Even though the settings are made on the port group, they are saved on each interface basis rather than on a port group basis. You can only view the settings in the view of each interface by using the display current-configuration or display this command. To configure a manual port group: 2. Create a manual port group and enter manual port group view. 3. Assign Ethernet interfaces to the manual port group. port-group manual port-group-name group-member interface-list N/A If you use the group-member interface-type interface-start-number to interface-type interface-end-number command to add multiple ports in batch to the specified port group, make sure all these ports are of the same type and on the same interface card, and the interface-end-number argument must be greater than the interface-start-number argument. Setting speed options for auto negotiation on an Ethernet interface Speed auto negotiation enables an Ethernet interface to negotiate with its peer for the highest speed that both ends support by default. You can narrow down the speed option list for negotiation. Figure 1 Speed auto negotiation application scenario IP network GE1/0/4 GE1/0/1 GE1/0/3 ( Speed 1000 Mbps ) ( Speed 1000 Mbps ) GE1/0/2 ( Speed 1000 Mbps ) Server 1 Server 2 Server 3 As shown in Figure 1, all ports on the device are operating in speed auto negotiation mode, with the highest speed of 1000 Mbps. If the transmission rate of each server in the server cluster is 1000 Mbps, their total transmission rate exceeds the capability of port GigabitEthernet 1/0/4, the port providing access to the Internet for the servers. 9

15 To avoid congestion on GigabitEthernet 1/0/4, set 100 Mbps as the only option available for speed negotiation on port GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3. As a result, the transmission rate on each port connected to a server is limited to 100 Mbps. To set speed options for auto negotiation on an Ethernet interface: Step Command 1. Enter system view. system-view 2. Enter Ethernet interface view. interface interface-type interface-number 3. Set speed options for auto negotiation. speed auto { } * This function is available only for 100-Mbps or 1000-Mbps Layer 2 Ethernet interfaces that support speed auto negotiation. Only the copper combo ports support this function. The speed and speed auto commands supersede each other, and whichever is configured last takes effect. Configuring storm suppression You can use the storm suppression function to limit the size of a particular type of traffic (broadcast, multicast, or unknown unicast traffic) that can be received on a per-interface basis in Ethernet interface view. In interface or port group view, you set the maximum size of broadcast, multicast or unknown unicast traffic allowed to be received on an interface or each interface in a port group. When the broadcast, multicast, or unknown unicast traffic received on the interface exceeds this threshold, the system discards packets until the traffic drops below this threshold. Configuration restrictions and guidelines The storm suppression thresholds configured for an Ethernet interface might become invalid if you enable the storm control function for the interface. For information about the storm control function, see "Configuring storm control on an Ethernet interface." For an Ethernet interface that belongs to a port group, if you set a traffic suppression threshold for the interface in both Ethernet interface view and port group view, the threshold configured last takes effect. Configuration procedure To set storm suppression thresholds on one or multiple Ethernet interfaces: 2. Enter Ethernet interface view or port group view. Enter Ethernet interface view: interface interface-type interface-number Enter port group view: port-group manual port-group-name Use one of the commands. To configure storm suppression on an Ethernet interface, enter Ethernet interface view. To configure storm suppression on a group of Ethernet interfaces, enter port group view. 10

16 3. Set the broadcast suppression threshold ratio. 4. Set the multicast suppression threshold ratio. 5. Set the unknown unicast suppression threshold ratio. broadcast-suppression { ratio pps max-pps kbps max-kbps } multicast-suppression { ratio pps max-pps kbps max-kbps } unicast-suppression { ratio pps max-pps kbps max-kbps } By default, broadcast traffic is allowed to pass through an interface. By default, multicast traffic is allowed to pass through an interface. By default, unknown unicast traffic is allowed to pass through an interface. Configuring jumbo frame support An Ethernet interface might receive some frames larger than the standard Ethernet frame size (called "jumbo frames") during high-throughput data exchanges such as file transfers. Usually, an Ethernet interface discards jumbo frames. With jumbo frame support enabled, the interface can process frames larger than the standard Ethernet frame size yet within the specified range. In interface configuration mode (Ethernet interface view or port group view), you can set the length of jumbo frames that are allowed to pass through Ethernet interfaces, as follows: If you execute the command in Ethernet interface view, the configuration takes effect only on the interface. If you execute the command in port group view, the configuration takes effect on all ports in the port group. To configure jumbo frame support in interface view or port group view: 2. Configure jumbo frame support. (Method 1) In port group view: a. port-group manual port-group-name b. jumboframe enable [ value ] (Method 2) In Ethernet interface view: c. interface interface-type interface-number d. jumboframe enable [ value ] Use one of the methods. By default, the device allows jumbo frames within the specified length to pass through all Layer 2 Ethernet interfaces. Enabling loopback detection on an Ethernet interface If a device receives a packet that it sent, a loop has occurred to the device. Loops might cause broadcast storms, which degrade network performance. You can use this feature to detect whether a loop has occurred. Single-port loopback occurs when an interface receives a packet that it sent and the receiving interface is the same as the sending interface, as shown in Figure 2. 11

17 Figure 2 Single-port loopback Figure 3 Multi-port loopback You can enable loopback detection to detect loops on an interface and, if the interface supports the loopback-detection action command, configure the protective action to take on the receiving interface when a loop is detected, for example, to shut down the interface. Depending on whether a protective action is configured, the device takes the actions in Table 1 to alleviate the impact of the loop condition. Table 1 Actions to take upon detection of a loop condition Port type Access port Hybrid or trunk port Actions No protective action is configured Place the receiving interface in controlled mode. The interface discards all incoming packets, but still forwards outgoing packets. Generate traps. Delete all MAC address entries of the interface. Generate traps. If loopback detection control is enabled, place the receiving interface in controlled mode. The interface discards all incoming packets, but still forwards outgoing packets. Delete all MAC address entries of the interface. A protective action is configured Perform the configured protective action. Generate traps and log messages. Delete all MAC address entries of the interface. Create traps and log messages. If loopback detection control is enabled, take the configured protective action on the interface. Delete all MAC address entries of the interface. Configuration restrictions and guidelines To use loopback detection on an Ethernet interface, you must enable the function both globally and on the interface. To disable loopback detection on all interfaces, run the undo loopback-detection enable command in system view. 12

18 To enable a hybrid or trunk port to take the administratively specified protective action, you must use the loopback-detection control enable command on the port. When you change the link type of an Ethernet interface by using the port link-type command, the switch removes the protective action configured on the interface. For more information about the port link-type command, see Layer 2 LAN Switching Command Reference. Configuration procedure To configure loopback detection: 2. Enable global loopback detection. 3. Enable multi-port loopback detection. 4. Set the loopback detection interval. 5. Enter Ethernet interface view or port group view. 6. Enable loopback detection on the interface. 7. Enable loopback detection control on a trunk port or a hybrid port. 8. Enable loopback detection in all VLANs on the trunk or hybrid port. 9. Set the protective action to take on the interface when a loop is detected. loopback-detection enable loopback-detection multi-port-mode enable loopback-detection interval-time time Enter Ethernet interface view: interface interface-type interface-number Enter port group view: port-group manual port-group-name loopback-detection enable loopback-detection control enable loopback-detection per-vlan enable loopback-detection action { no-learning semi-block shutdown } By default, global loopback detection is disabled. By default, multi-port loopback detection is disabled, and the router can detect only single-port loops. The default setting is 30 seconds. Use one of the commands. To configure loopback detection on one interface, enter Ethernet interface view. To configure loopback detection on a group of Ethernet interfaces, enter port group view. By default, loopback detection is disabled. By default, loopback detection control is disabled. By default, a trunk or hybrid port performs loopback detection only in its PVID. By default, when a loop is detected on an interface, the interface does not forward any data packet. With the shutdown keyword specified, the looped port is automatically shut down and its physical state changes to Loop down. After the loop is removed, use the undo shutdown command on the port to recover its forwarding capability. 13

19 Setting the MDI mode of an Ethernet interface IMPORTANT: Fiber ports do not support the MDI mode setting. You can use both crossover and straight-through Ethernet cables to connect copper Ethernet interfaces. To accommodate these types of cables, a copper Ethernet interface can operate in one of the following Medium Dependent Interface (MDI) modes: Across mode Normal mode Auto mode A copper Ethernet interface uses an RJ-45 connector, which comprises eight pins, each of which plays a dedicated role. For example, pins 1 and 2 transmit signals, and pins 3 and 6 receive signals. The pin role varies by the MDI modes as follows: In normal mode, pins 1 and 2 are transmit pins, and pins 3 and 6 are receive pins. In across mode, pins 1 and 2 are receive pins, and pins 3 and 6 are transmit pins. In auto mode, the interface negotiates pin roles with its peer. To enable the interface to communicate with its peer, make sure its transmit pins are connected to the remote receive pins. If the interface can detect the connection cable type, set the interface in auto MDI mode. If not, set its MDI mode by using the following guidelines: When a straight-through cable is used, set the interface to operate in the MDI mode different than its peer. When a crossover cable is used, set the interface to operate in the same MDI mode as its peer, or set either end to operate in auto mode. To set the MDI mode of an Ethernet interface: 2. Enter Ethernet interface view. 3. Set the MDI mode of the Ethernet interface. interface interface-type interface-number mdi { across auto normal } N/A By default, a copper Ethernet interface operates in auto mode to negotiate pin roles with its peer. Testing the cable connection of an Ethernet interface IMPORTANT: Fiber ports do not support this feature. If the link of an Ethernet port is up, testing its cable connection will cause the link to come down and then go up. 14

20 You can test the cable connection of an Ethernet interface for a short or open circuit. The device displays cable test results within 5 seconds. If any fault is detected, the test results include the length of the faulty cable segment. To test the cable connection of an Ethernet interface: Step Command 1. Enter system view. system-view 2. Enter Ethernet interface view. interface interface-type interface-number 3. Test the cable connected to the Ethernet interface. virtual-cable-test Configuring storm control on an Ethernet interface Storm control compares broadcast, multicast, and unknown unicast traffic regularly with their respective traffic thresholds on an Ethernet interface. For each type of traffic, storm control provides a lower threshold and a higher threshold. For management purposes, you can configure the interface to send threshold event traps and log messages when monitored traffic exceeds the upper threshold or falls below the lower threshold from the upper threshold. Depending on your configuration, when a particular type of traffic exceeds its upper threshold, the interface does either of the following: Blocks this type of traffic, while forwarding other types of traffic. Even though the interface does not forward the blocked traffic, it still counts the traffic. When the blocked traffic drops below the lower threshold, the port begins to forward the traffic. Shuts down automatically. The interface shuts down automatically and stops forwarding any traffic. When the blocked traffic is detected dropping below the lower threshold, the port does not forward the traffic. To bring up the interface, use the undo shutdown command or disable the storm control function. Alternatively, you can configure the storm suppression function to control a specific type of traffic. Do not enable them both on an Ethernet interface at the same time because the storm suppression and storm control functions are mutually exclusive. For example, with an unknown unicast suppression threshold set on an Ethernet interface, do not enable storm control for unknown unicast traffic on the interface. For more information about storm suppression, see "Configuring storm suppression." Configuration guidelines For network stability, use the default or set a higher traffic polling interval. Storm control uses a complete polling cycle to collect traffic data, and analyzes the data in the next cycle. An interface takes one to two polling intervals to take a storm control action. The storm control function allows you to set the upper and lower thresholds for all three types of packets separately on the same interface. Configuration procedure To configure storm control on an Ethernet interface: 15

21 2. Set the traffic polling interval of the storm control module. 3. Enter Ethernet interface view. 4. Enable storm control, and set the lower and upper thresholds for broadcast, multicast, or unknown unicast traffic. 5. Set the control action to take when monitored traffic exceeds the upper threshold. 6. Enable the interface to send storm control threshold event traps. 7. Enable the interface to log storm control threshold events. storm-constrain interval seconds interface interface-type interface-number storm-constrain { broadcast multicast unicast } { pps kbps ratio } max-pps-values min-pps-values storm-constrain control { block shutdown } storm-constrain enable trap storm-constrain enable log The default setting is 10 seconds. N/A By default, storm control is disabled. No action is taken on an Ethernet interface when a type of traffic exceeds the upper storm control threshold. By default, the interface sends traps when monitored traffic exceeds the upper threshold or drops below the lower threshold from the upper threshold. By default, the interface outputs log messages when monitored traffic exceeds the upper threshold or falls below the lower threshold from the upper threshold. Configuring a Layer 3 Ethernet interface or subinterface Layer 3 Ethernet interface configuration task list Perform the following configuration on Ethernet interfaces operating in route mode: Task Setting the MTU for an Ethernet interface or subinterface Configuring an Ethernet interface to operate in promiscuous mode Remarks Applicable to Layer 3 Ethernet interfaces and Ethernet subinterfaces. Applicable to Layer 3 Ethernet interfaces. 16

22 Setting the MTU for an Ethernet interface or subinterface The value of Maximum Transmission Unit (MTU) affects the fragmentation and re-assembly of IP packets. To set the MTU for an Ethernet interface or subinterface: 2. Enter Ethernet interface or subinterface view. interface interface-type { interface-number interface-number.subnumber } N/A 3. Set the MTU. mtu size The default setting is Due to the QoS queue length limit (for example, the default length of an FIFO queue is 75), too small an MTU will result in too many fragments, which will be discarded from the QoS queue. You can increase MTU or QoS queue length. In Ethernet interface view, you can use the qos fifo queue-length command to change the QoS queue length. For more information, see ACL and QoS Configuration Guide. Configuring an Ethernet interface to operate in promiscuous mode An Ethernet interface usually receives only packets with matched destination MAC addresses. After you configure an Ethernet interface to operate in promiscuous mode, however, the interface no longer checks the MAC addresses in received packets. Rather, it receives all Ethernet packets with correct format. You might need to configure a network listening port to operate in promiscuous mode. To configure an Ethernet interface to operate in promiscuous mode: 2. Enter Ethernet interface view. 3. Configure the Ethernet interface to operate in promiscuous mode. interface interface-type interface-number promiscuous N/A By default, an Ethernet interface does not operate in promiscuous mode. Displaying and maintaining an Ethernet interface or subinterface Task Command Remarks Display Ethernet interface or subinterface information. display interface [ interface-type ] brief [ down ] [ { begin exclude include } regular-expression ] display interface interface-type { interface-number interface-number.subnumber } [ brief ] [ { begin exclude include } regular-expression ] Available in any view. 17

23 Task Command Remarks Display traffic statistics for the specified interfaces. Display traffic rate statistics over the last sampling interval. Display information about discarded packets on the specified interfaces. Display summary information about discarded packets on all interfaces. Display information about a manual port group or all manual port groups. Display information about the loopback function. Display information about Layer 3 virtual Ethernet interfaces. Display information about storm control. Clear the interface or subinterface statistics. Clear the statistics of discarded packets on the specified interfaces. Clear the statistics of the specified Layer 3 virtual Ethernet interface. display counters { inbound outbound } interface [ interface-type ] [ { begin exclude include } regular-expression ] display counters rate { inbound outbound } interface [ interface-type ] [ { begin exclude include } regular-expression ] display packet-drop interface [ interface-type [ interface-number ] ] [ { begin exclude include } regular-expression ] display packet-drop summary [ { begin exclude include } regular-expression ] display port-group manual [ all name port-group-name ] [ { begin exclude include } regular-expression ] display loopback-detection [ { begin exclude include } regular-expression ] display interface [ virtual-ethernet ] [ brief [ down ] ] [ { begin exclude include } regular-expression ] display interface virtual-ethernet { interface-number } [ brief ] [ { begin exclude include } regular-expression ] display storm-constrain [ broadcast multicast unicast ] [ interface interface-type interface-number ] [ { begin exclude include } regular-expression ] reset counters interface [ interface-type [ interface-number interface-number.subnumber ] ] reset packet-drop interface [ interface-type [ interface-number ] ] reset counters interface [ virtual-ethernet [ interface-number ] Available in any view. Available in any view. Available in any view. Available in any view. Available in any view. Available in any view. Available in any view. Available in any view. Available in user view. Available in user view. Available in user view. The display port-group manual, display packet-drop interface, display packet-drop summary, display loopback-detection, display storm-constrain, and reset packet-drop interface commands are supported on only 6604/6608/6616 routers configured with RPE-X1 or RSE-X1 modules. 18

24 Configuring ATM interfaces ATM interface ATM Asynchronous Transfer Mode (ATM) is a backbone network technology for transmission of audio, video, and data. By virtue of its flexibility and support for multimedia services, ATM is regarded as a core technology for implementing broadband communications. The ATM physical layer lies at the bottom of the ATM reference model. Though it involves specific transmission media, its functionality does not rely on the transmission mechanism and speed of a specific medium. Rather, it primarily delivers valid cells and the associated timing signals between the upper layer and transmission medium. The speeds of physical access media are defined in international standards such as ATM OC-3c/STM-1 and ATM E3/T3. ATM interfaces available on the 6600 and HSR6600 routers The 6600 and HSR6600 routers provide the following ATM interfaces: IMA-E1/T1 ATM OC-3c/STM-1 based on SONET/SDH These interfaces support IPoA, IPoEoA, PPPoA, and PPPoEoA. For more information about them, see Layer 2 WAN Configuration Guide. ATM interface features The ATM interfaces of low-end and middle-range routers support: Nonreal-time variable bit rate (nrt_vbr) Real-time variable bit rate (rt_vbr) Constant bit rate (CBR) Unspecified bit rate (UBR) Permanent virtual circuit (PVC) Per-VC traffic shaping User-to-network Interface (UNI) RFC1483, Multiprotocol Encapsulation over ATM Adaptation Layer 5 RFC2225, Classical IP and ARP over ATM RFC2390, Inverse Address Resolution Protocol F5 end to end loopback OAM ATM adaptation layer 5 (AAL5) 19

25 IMA This section describes physical parameter configuration of ATM E1/T1 interfaces. For more information (including the configuration of PVCs), see Layer 2 WAN Configuration Guide. Configuring an ATM E1/T1 interface 2. Enter ATM E1/T1 interface view. interface atm interface-number N/A 3. Set the clock mode. clock { master slave } The default setting is slave. 4. Enable automatic clock mode change. 5. Set the framing format. 6. Set the line coding format. clock-change auto On an E1 interface: frame-format { crc4-adm no-crc4-adm } On a T1 interface: frame-format { esf-adm sf-adm } On an E1 interface: code { ami hdb3 } On a T1 interface: code { ami b8zs } This function is disabled by default. By default, the framing format for an E1 interface is CRC4 ADM and that for an T1 interface is ESF ADM. The default line coding format for an E1 interface is HDB3 and for a T1 interface is B8ZS. 7. Enable scrambling. scramble Scrambling is enabled by default. 8. Set the cable mode. cable { long short } The default cable mode is long. In this mode, the system automatically adapts the cable mode to the cable actually connected. 9. Set the intended bandwidth for the ATM E1/T1 interface. 10. Set the loopback mode. 11. Restore the default settings for the ATM E1/T1 interface. bandwidth bandwidth-value loopback { cell local payload remote } default Loopback is disabled by default. 20

26 NOTE: E1 configurations are supported on the IMA (E1) interface module and T1 configurations on the IMA (T1) interface module. Troubleshooting ATM E1/T1 interfaces You can start troubleshooting an ATM interface by testing network connectivity using the ping command or the extended ping command. In an extended ping command, specify some options in the IP header. For more information about the ping command, see Network Management and Monitoring Configuration Guide. If the interface cannot be pinged, check whether: The interface is down. The AAL5 encapsulation type of the PVC is incorrect. Configuring an ATM OC-3c/STM-1 interface Overview This section covers only the physical configurations of the interface. For more information about how to configure ATM (including PVCs), see Layer 2 WAN Configuration Guide. Configuration procedure To configure an ATM OC-3c/STM-1 interface: 2. Enter ATM OC-3c/STM-1 interface view. interface atm interface-number N/A 3. Set the clock mode. clock { master slave } 4. Set the framing format. frame-format { sdh sonet } 5. Enable scrambling. scramble The default setting is slave. The default setting is SDH STM-1. Scrambling is enabled by default. 6. Configure the overhead bytes. flag c2 flag-value flag { j0 j1 } { sdh sonet } flag-value The default is hexadecimal 13 for C2. By default, SDH framing applies. In SDH framing, the defaults are null for both J0 and J1. Support for keywords sdh and sonet varies with device models. 21

27 7. Set the loopback mode. loopback { cell local remote } 8. Set the intended bandwidth for the ATM OC-3c/STM-1 interface. 9. Restore the default settings for the ATM OC-3c/STM-1 interface. bandwidth bandwidth-value default Loopback is disabled by default. Displaying and maintaining ATM interfaces Task Command Remarks Display information about a specified or all ATM interfaces. Clear the statistics on all PVCs on a specified ATM interface. Clear the statistics on an ATM interface. display interface [ atm ] [ brief [ down ] ] [ { begin exclude include } regular-expression ] display interface atm interface-number [ brief ] [ { begin exclude include } regular-expression ] reset atm interface [ atm [ interface-number ] ] reset counters interface [ atm [ interface-number ] ] Available in any view. Available in user view. Available in user view. NOTE: For those physical interfaces that are not connected to cables, shut down them using the shutdown command to avoid anomalies resulted from interference. Troubleshooting ATM interfaces When diagnosing ATM interface problems, first test the interface with the ping command or the extended ping command. The ping command can test network connectivity. Extended ping command can be used to specify some options in the IP header in addition to that function. For more information about the ping command, see Network Management and Monitoring Configuration Guide. If the interface cannot be pinged, check whether: The interface is down, which causes missing of its route in the routing table. The AAL5 encapsulation of the PVC is incorrect (for 155 Mbps ATM interfaces only). 22

28 Configuring WAN interfaces In terms of link type, wide area networks (WANs) include Frame Relay (FR) and ATM. Routers are designed with the synchronous serial interface, ATM interface, and CE1 interface. The system supports the synchronous serial interface, CE1 interface, CT1 interface, CE3 interface, and CT3 interface. Configuring a synchronous serial interface A synchronous serial interface has the following features: Works in either DTE or DCE mode. Typically, the synchronous serial interfaces on the device are used as DTE to accept the clock provided by DCE. Supports various types of cables, including V.24, V.35, X.21, RS449, and RS530. The device can automatically detect the type of connected cables and select electrical properties. In most cases, you do not need to configure them manually. Supports link layer protocols such as PPP and FR. Supports IP for the network layer. To display the cable type, operating mode (DTE or DCE), and other settings of synchronous serial interfaces, use the display interface serial command. To configure a synchronous serial interface: 2. Enter synchronous serial interface view. interface serial interface-number N/A 3. Set the interface description. description text 4. Set the link layer protocol. link-protocol { fr hdlc ppp } By default, the description of a synchronous serial interface is interface name Interface, for example, Serial1/2/0 Interface. The default is PPP. 5. Set the digital signal coding format. 6. Set the baud rate. code { nrz nrzi } baudrate baudrate virtualbaudrate virtualbaudrate The default is non-return-to-zero (NRZ). The default is 64,000 bps. 23

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