HP MSR Router Series. Interface Configuration Guide(V7) Part number: a Software version: CMW710-R0106 Document version: 6PW

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1 HP MSR Router Series Interface Configuration Guide(V7) Part number: a Software version: CMW710-R0106 Document version: 6PW

2 Legal and notice information Copyright 2014 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. i

3 Contents Legal and notice information i Bulk configuring interfaces 1 Configuration restrictions and guidelines 1 Configuration procedure 1 Displaying and maintaining bulk interface configuration 2 Configuring Ethernet interfaces 3 Configuring common Ethernet interface settings 3 Configuring a combo interface 3 Configuring basic settings of an Ethernet interface or subinterface 4 Configuring the link mode of an Ethernet interface 5 Configuring jumbo frame support 6 Configuring dampening on an Ethernet interface 7 Performing a loopback test on an Ethernet interface 8 Configuring generic flow control on an Ethernet interface 9 Setting the statistics polling interval 10 Configuring a Layer 2 Ethernet interface 10 Configuring storm suppression 10 Setting the MDIX mode of an Ethernet interface 11 Configuring a Layer 3 Ethernet interface or subinterface 11 Setting the MTU for an Ethernet interface or subinterface 11 Configuring the MAC address of an Ethernet interface or subinterface 12 Displaying and maintaining an Ethernet interface or subinterface 12 Configuring WAN interfaces 14 Configuring a serial interface 14 Asynchronous serial interface 14 Synchronous serial interface 14 Configuring an asynchronous serial interface 15 Configuring a synchronous serial interface 16 Displaying and maintaining serial interfaces 17 Configuring an AM interface 17 Configuration procedure 18 Displaying and maintaining AM interfaces 19 Configuring an ISDN BRI interface 19 Configuration prerequisites 20 Configuration procedure 20 Displaying and maintaining ISDN BRI interfaces 21 Configuring a CE1/PRI interface 21 Configuring a CE1/PRI interface in E1 mode 22 Configuring a CE1/PRI interface in CE1 mode 22 Configuring a CE1/PRI interface in PRI mode 23 Configuring other CE1/PRI interface parameters 23 Displaying and maintaining CE1/PRI interfaces 24 Configuring a CT1/PRI interface 25 Configuring a CT1/PRI interface in CT1 mode 25 Configuring a CT1/PRI interface in PRI mode 25 Configuring other CT1/PRI interface parameters 26 Starting a BERT test on a CT1/PRI interface 27 i

4 Displaying and maintaining CT1/PRI interfaces 28 Configuring an E1-F interface 28 Configuring an E1-F interface in framed mode 28 Configuring an E1-F interface in unframed mode 29 Configuring other E1-F interface parameters 29 Displaying and maintaining E1-F interfaces 30 Configuring a T1-F interface 30 Configuration procedure 31 Starting a BERT test on a T1-F interface 32 Displaying and maintaining T1-F interfaces 33 Configuring a CE3 interface 33 Configuring a CE3 interface in E3 mode 34 Configuring a CE3 interface in CE3 mode 34 Displaying and maintaining CE3 interfaces 36 Configuring a CT3 interface 36 Configuring a CT3 interface in T3 mode 37 Configuring a CT3 interface in CT3 mode 38 Displaying and maintaining CT3 interfaces 40 Configuring POS interfaces 42 Overview 42 SONET and SDH 42 POS 42 Feature and hardware compatibility 42 Configuring a standard POS interface 43 Configuring a POS channel interface 44 Displaying and maintaining POS interfaces 45 POS interface configuration example 45 Network requirements 45 Configuration procedure 45 Verifying the configuration 46 Troubleshooting POS interfaces 46 Symptom 1 46 Solution 46 Symptom 2 46 Solution 46 Symptom 3 47 Solution 47 Configuring CPOS interfaces 48 Overview 48 Overhead bytes 48 CPOS interface application scenarios 49 Feature and hardware compatibility 49 CPOS interface configuration task list 50 Configuring the operating mode of an interface card 50 Configuring basic functions of a CPOS interface 50 Configuring an E1 channel 51 Configuring a T1 channel 52 Displaying and maintaining CPOS interfaces 53 CPOS-E1 interface configuration example 53 Network requirements 53 Configuration procedure 54 Verifying the configuration 55 Troubleshooting CPOS interfaces 55 ii

5 Interface physical status is up, link protocol status is down, and loopback is detected 55 Configuring ATM interfaces 57 Overview 57 ATM and DSL 57 ATM interface types 57 ATM interface features 57 Configuring an ATM OC-3c/STM-1 interface 58 Configuring an ADSL interface 59 Overview 59 Configuration procedure 60 Configuring a G.SHDSL interface 61 Overview 61 Configuration procedure 61 Configuring an ATM subinterface 63 Configuring an EFM interface 63 Configuring an EFM subinterface 65 Displaying and maintaining ATM interfaces 65 Troubleshooting ATM interfaces 66 Interface state error 66 Frequent packet dropping, CRC check errors, and interface state errors 66 Troubleshooting DSL interfaces 66 Configuring loopback, null, and inloopback interfaces 68 Configuring a loopback interface 68 Configuring a null interface 69 Configuring an inloopback interface 69 Displaying and maintaining loopback, null, and inloopback interfaces 69 Support and other resources 70 Contacting HP 70 Subscription service 70 Related information 70 Documents 70 Websites 70 Conventions 71 Index 73 iii

6 Bulk configuring interfaces You can enter interface range view to bulk configure multiple interfaces with the same feature instead of configuring them one by one. For example, you can execute the shutdown command in interface range view to shut down a range of interfaces. Configuration restrictions and guidelines When you bulk configure interfaces in interface range view, follow these restrictions and guidelines: In interface range view, only the commands supported by the first interface are available. The first interface is specified with the interface range command. You cannot enter the view of some interfaces by using the interface interface-type { interface-number interface-number.subnumber } command, for example, BRI 2/1/1:1. Do not configure any of these interfaces as the first interface in the interface range. Do not assign both an aggregate interface and any of its member interfaces to an interface range. Some commands, after being executed on both an aggregate interface and its member interfaces, can break up the aggregation. No limit is set on the maximum number of interfaces in an interface range. The more interfaces in an interface range, the longer the command execution time. The maximum number of interface range names is only limited by the system resources. To guarantee bulk interface configuration performance, HP recommends that you configure fewer than 1000 interface range names. If a command fails to take effect on the first interface in an interface range, the command does not take effect on any other member interfaces. Failure to apply a command on a non-first member interface does not affect the application of the command on the other member interfaces. Configuration procedure To bulk configure interfaces: 1. Enter system view. system-view 2. Enter interface range view. interface range { interface-type interface-number [ to interface-type interface-number ] } &<1-5> interface range name name [ interface { interface-type interface-number [ to interface-type interface-number ] } &<1-5> ] By using the interface range name command, you assign a name to an interface range and can specify this name rather than the interface range to enter the interface range view. 1

7 3. (Optional.) Display commands available for the first interface in the interface range. 4. Use available commands to configure the interfaces. Enter a question mark (?) at the interface range prompt. Available commands vary by 5. (Optional.) Verify the configuration. display this Displaying and maintaining bulk interface configuration Execute the display command in any view. Task Display information about the interface ranges created by using the interface range name command. Command display interface range [ name name ] 2

8 Configuring Ethernet interfaces In this chapter, "MSR1000" refers to MSR "MSR2000" refers to MSR2003, MSR , MSR "MSR3000" collectively refers to MSR3012, MSR3024, MSR3044, MSR3064. "MSR4000" collectively refers to MSR4060 and MSR4080. 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 switch packets. Layer 3 Ethernet interfaces Physical Ethernet interfaces operating at the network layer (Layer 3) to route packets. You can assign an IP address to a Layer 3 Ethernet 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 sub 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. Configuring common Ethernet interface settings This section describes the settings common to Layer 2 and Layer 3 Ethernet interfaces or subinterfaces. For more information about the settings specific to Layer 2 and Layer 3 Ethernet interfaces or subinterfaces, see "Configuring a Layer 2 Ethernet interface" and "Configuring a Layer 3 Ethernet interface or sub" Configuring a combo interface A combo interface is a logical interface that physically 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 activate one port, the other port is automatically disabled. In the interface view, 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 and identify the two physical interfaces that compose each combo interface according to the marks on the device panel. Use the display interface command to determine which port (fiber or copper) of the combo interface is active. If the current port is the copper port, the output includes "Media type is twisted pair, Port hardware type is 1000_BASE_T." If the current port is the fiber port, the output does not include this information. You can also use the display this command in the view of the combo interface to view the combo interface configuration. If the combo enable fiber command exists, the fiber port is active. If the command does not exist, the copper port is active. 3

9 Changing the active port of a combo interface 1. Enter system view. system-view 2. Enter Ethernet interface view. 3. Activate the copper combo port or fiber combo port. interface interface-type interface-number combo enable { copper fiber } By default, the copper combo port is active. Configuring basic settings of an Ethernet interface or subinterface You can set an Ethernet interface to operate in one of the following duplex modes: Full-duplex mode (full) Interfaces can send and receive packets simultaneously. Half-duplex mode (half) Interfaces cannot send and receive packets simultaneously. Autonegotiation mode (auto) Interfaces 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. Configuring an Ethernet interface 1. Enter system view. system-view 2. Enter Ethernet interface view. 3. Set the interface description. 4. Set the duplex mode of the Ethernet 5. Set the port speed. 6. Configure the expected bandwidth of the 7. Restore the default settings for the Ethernet interface interface-type interface-number description text duplex { auto full half } speed { auto } bandwidth bandwidth-value default The default setting is in the format of interface-name Interface. For example, GigabitEthernet2/0/1 Interface. The default setting is full for 10-GE interfaces and auto for other Ethernet interfaces. Fiber ports do not support the half keyword. By default, the auto keyword is used. Support for the keywords of the command depends on the interface type. For more information, see Interface Command References. By default, the expected bandwidth (in kbps) is the interface baud rate divided by

10 8. Bring up the Ethernet undo shutdown By default, the Ethernet interface is down. Configuring an Ethernet subinterface 1. Enter system view. system-view 2. Create an Ethernet sub interface interface-type interface-number.subnumber 3. Set the interface description. description text 4. Restore the default settings for the Ethernet sub default The default setting is interface-name Interface. For example, GigabitEthernet2/0/1.1 Interface. 5. Configure the expected bandwidth of the 6. Bring up the Ethernet sub bandwidth bandwidth-value undo shutdown By default, the expected bandwidth (in kbps) is the interface baud rate divided by By default, the Ethernet subinterface is down. For the local and remote Ethernet subinterfaces to transmit traffic correctly, configure them with the same subinterface number and VLAN ID. Configuring the link mode of an Ethernet interface CAUTION: After you change the link mode of an Ethernet interface, all commands (except the shutdown command) on the Ethernet interface are restored to their defaults in the new link mode. Interfaces operate differently 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 interfaces can operate only as Layer 3 Ethernet interfaces (in route mode). Some interfaces can operate either as Layer 2 or Layer 3 Ethernet interfaces. You can set the link mode to bridge or route. To change the link mode of an Ethernet interface: 1. Enter system view. system-view 2. Enter Ethernet interface view. interface interface-type interface-number 5

11 3. Change the link mode of the Ethernet port link-mode { bridge route } By default, the following interfaces operate as Layer 2 Ethernet interfaces: Ethernet interfaces on a SIC-4FSW, SIC-4GSW, DSIC-9FSW, HMIM-8GSW, or HMIM-24GSW interface card. Ethernet interfaces GigabitEthernet 0/3 to GigabitEthernet 0/27 on an MSR router. Ethernet interfaces GigabitEthernet 0/3 to GigabitEthernet 0/50 on an MSR router. 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. The Ethernet interface processes jumbo frames in the following ways: When the Ethernet interface is configured to deny jumbo frames, the Ethernet interface discards jumbo frames without further processing. When the Ethernet interface is configured with jumbo frame support, the Ethernet interface: Processes jumbo frames within the specified length. Discards jumbo frames beyond the specified length without further processing. To configure jumbo frame support in interface view: 1. Enter system view. system-view 2. Enter Ethernet interface view. 3. Configure jumbo frame support. interface interface-type interface-number jumboframe enable [ value ] By default, the device allows jumbo frames within the specified length to pass through all Layer 2 Ethernet interfaces. The length of jumbo frames that are allowed to pass depends on the device model. For more information, see Interface Command References. If you set the value argument multiple times, the most recent configuration takes effect. 6

12 Configuring dampening on an Ethernet interface Parameters The interface dampening feature uses an exponential decay mechanism to suppress the effects of excessive interface flapping events on routing protocols and routing tables in the network. Suppressing interface state change events protects the system processing resources. If an interface is not dampened, its state changes are reported. For each state change, the system also generates an SNMP notification and log message. After a flapping interface is dampened, it does not report its state changes to the CPU. For state change events, the interface only generates SNMP notifications and log messages. Penalty The interface has a initiate penalty of 0. When the interface flaps, it is assigned a penalty of 1000 for each down even, and does not increase for up events. Ceiling The penalty stops increasing after it reaches the ceiling. Suppress-limit The accumulated penalty that triggers the device to dampen the In dampened state, the interface does not report its state changes to the CPU. For state change events, the interface only generates SNMP notifications and log messages Reuse-limit When the accumulated penalty decreases to this reuse threshold, the interface is not dampened. Interface state changes are reported to the higher layers. For each state change, the system also generates an SNMP notification and log message. Decay The amount of time (in seconds) after which a penalty is decreased. Max-suppress-time The maximum amount of time the interface can be dampened. If the penalty is still higher than the reuse threshold when this timer expires, the penalty stops increasing for down events. The maximum penalty is equal to 2 (Max-suppress-time/Decay) reuse-limit. It is not user configurable. Figure 1 shows the change rule of the penalty value. t 0 and t 2 indicate the start time and end time of the suppression, respectively. The period from t 0 to t 2 indicates the suppression period, t 0 to t 1 indicates the max-suppress-time, and t 1 to t 2 indicates the complete decay period. 7

13 Figure 1 Change rule of the penalty value Penalty t0 t1 t2 Ceiling Suppress limit Reuse limit Not suppressed Suppressed Not suppressed Time Configuration restrictions and guidelines The dampening command does not take effect on the administratively down events. When you execute the shutdown command, the penalty restores to 0, and the interface reports the down event to the higher layer protocols. Configuration procedure To configure dampening on an Ethernet interface: 1. Enter system view. system-view 2. Enter Ethernet interface view. interface interface-type interface-number 3. Enable dampening on the dampening [ half-life reuse suppress max-suppress-time ] By default, interface dampening is disabled on Ethernet interfaces. Performing a loopback test on an Ethernet interface If an Ethernet interface does not work correctly, you can perform a loopback test on it to identify the problem. An Ethernet interface in a loopback test does not forward data traffic. Only internal loopback tests are supported. In an internal loopback test, all on-chip functions related to the Ethernet interface are tested. 8

14 Configuration restrictions and guidelines On an administratively shut down Ethernet interface (displayed as in ADM or Administratively DOWN state), you cannot perform an internal loopback test. The speed, duplex, mdix-mode, and shutdown commands are not available during a loopback test. During a loopback test, the Ethernet interface operates in full duplex mode. When a loopback test is complete, the port returns to its duplex setting. Configuration procedure 1. Enter system view. system-view 2. Enter Ethernet interface view. interface interface-type interface-number 3. Perform a loopback test. loopback internal By default, no loopback test is performed. Configuring generic flow control on an Ethernet interface To avoid packet drops on a link, you can enable generic flow control at both ends of the link. When traffic congestion occurs at the receiving end, the receiving end sends a flow control (Pause) frame to ask the sending end to suspend sending packets. With TxRx mode generic flow control enabled, an interface can both send and receive flow control frames. When congestion occurs, the interface sends a flow control frame to its peer. When the interface receives a flow control frame from the peer, it suspends sending packets. With Rx flow mode generic control enabled, an interface can receive flow control frames, but it cannot send flow control frames. When the interface receives a flow control frame from its peer, it suspends sending packets to the peer. When congestion occurs, the interface cannot send flow control frames to the peer. To handle unidirectional traffic congestion on a link, configure the flow-control receive enable command at one end and the flow-control command at the other end. To enable both ends of a link to handle traffic congestion, configure the flow-control command at both ends. To enable generic flow control on an Ethernet interface: 1. Enter system view. system-view 2. Enter Ethernet interface view. 3. Enable generic flow control. interface interface-type interface-number Enable TxRx mode generic flow control: flow-control Enable Rx mode generic flow control: flow-control receive enable By default, generic flow control is disabled on an Ethernet 9

15 Setting the statistics polling interval 1. Enter system view. system-view 2. Set the statistics polling interval. flow-interval interval By default, the statistics polling interval is 300 seconds. Settings in system view take effect on all Ethernet interfaces. To display the interface statistics collected in the last polling interval, use the display interface command. To clear interface statistics, use the reset counters interface command. Configuring a Layer 2 Ethernet interface 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) on an When the broadcast, multicast, or unknown unicast traffic on the interface exceeds this threshold, the system discards packets until the traffic drops below this threshold. Configuration guidelines When you configure the suppression threshold in pps, the device might convert the configured value into a multiple of a certain step supported by the chip. As a result, the actual suppression threshold might be different from the configured one. For the suppression threshold that takes effect, see the prompt on the device. Configuration procedure To set storm suppression thresholds on one or multiple Ethernet interfaces: 1. Enter system view. system-view 2. Enter Ethernet interface or subinterface view. 3. Enable broadcast suppression and set the broadcast suppression threshold. 4. Enable multicast suppression and set the multicast suppression threshold. 5. Enable unknown unicast suppression and set the unknown unicast suppression threshold. interface interface-type { interface-number interface-number.subnumber } broadcast-suppression { ratio pps max-pps } multicast-suppression { ratio pps max-pps } unicast-suppression { ratio pps max-pps } By default, broadcast traffic is allowed to pass through an By default, multicast traffic is allowed to pass through an By default, unknown unicast traffic is allowed to pass through an 10

16 Setting the MDIX mode of an Ethernet interface NOTE: Fiber ports do not support the MDIX mode setting. A physical Ethernet interface 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. 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-Crossover (MDIX) modes: MDIX mode Pins 1 and 2 are receive pins and pins 3 and 6 are transmit pins. MDI mode Pins 1 and 2 are transmit pins and pins 3 and 6 are receive pins. AutoMDIX mode The interface negotiates pin roles with its peer. To enable the interface to communicate with its peer, set the MDIX mode of the interface mode by using the following guidelines: Generally, set the MDIX mode of the interface to AutoMDIX. Set the MDIX mode of the interface to MDI or MDIX only when the device cannot determine the cable type. When a straight-through cable is used, set the interface to operate in the MDIX mode different than its peer. When a crossover cable is used, set the interface to operate in the same MDIX mode as its peer, or set either end to operate in AutoMDIX mode. To set the MDIX mode of an Ethernet interface: 1. Enter system view. system-view 2. Enter Ethernet interface view. 3. Set the MDIX mode of the Ethernet interface interface-type interface-number mdix-mode { automdix mdi mdix } By default, a copper Ethernet interface operates in auto mode to negotiate pin roles with its peer. Configuring a Layer 3 Ethernet interface or subinterface Setting the MTU for an Ethernet interface or subinterface The value of maximum transmission unit (MTU) affects the fragmentation and reassembly of IP packets. Generally, you do not need to modify the MTU of an To set the MTU for an Ethernet interface or subinterface: 11

17 1. Enter system view. system-view 2. Enter Ethernet interface or subinterface view. interface interface-type { interface-number interface-number.subnumber } 3. Set the MTU. mtu size The default setting varies by interface types. For more information, see Interface Command References. Configuring the MAC address of an Ethernet interface or subinterface In a network, when the Layer 3 Ethernet interfaces or subinterfaces of different devices have the same MAC address, the devices might fail to communicate correctly. To eliminate the MAC address conflicts, use the mac-address command to modify the MAC addresses of Layer 3 Ethernet interfaces or subinterfaces. Additionally, when a Layer 3 Ethernet subinterface is created, it uses the MAC address of its main interface by default. As a result, all Layer 3 Ethernet subinterfaces of a Layer 3 Ethernet interface share the same MAC address. To configure a different MAC address for a specific Layer 3 Ethernet subinterface, use the mac-address command. To configure the MAC address of an Ethernet interface or subinterface: 1. Enter system view. system-view 2. Enter Ethernet interface view. 3. Configure the MAC address of the Ethernet interface or sub interface interface-type { interface-number interface-number.subnumber } mac-address mac-address The default MAC address of a Layer 3 Ethernet interface varies by devices. The default MAC address of a Layer 3 Ethernet subinterface is the same as the MAC address of its host HP recommends not configuring a MAC address in the VRRP-reserved MAC address range for a Layer 3 Ethernet sub Displaying and maintaining an Ethernet interface or subinterface Execute display commands in any view and reset commands in user view. 12

18 Task Display interface traffic statistics. Display traffic rate statistics of interfaces in up state over the last sampling interval. Display the operational and status information of the specified interface or all interfaces. Display information about dropped packets on the specified interface or all interfaces. Display the Ethernet statistics (MSR1000/MSR2000/MSR3000). Display the Ethernet statistics (MSR4000). Clear the interface or subinterface statistics. Clear the statistics of dropped packets on the specified interfaces. Clear the Ethernet statistics (MSR1000/MSR2000/MSR3000). Clear the Ethernet statistics (MSR4000). Command display counters { inbound outbound } interface [ interface-type [ interface-number interface-number.subnumber ] ] display counters rate { inbound outbound } interface [ interface-type [ interface-number interface-number.subnumber ] ] display interface [ interface-type [ interface-number interface-number.subnumber ] ] [ brief [ description down ] ] display packet-drop { interface [ interface-type [ interface-number ] ] summary } display ethernet statistics display ethernet statistics slot slot-number reset counters interface [ interface-type [ interface-number interface-number.subnumber ] ] reset packet-drop interface [ interface-type [ interface-number ] ] reset ethernet statistics reset ethernet statistics slot slot-number 13

19 Configuring WAN interfaces This chapter describes how to configure interfaces for connecting to WAN networks, including ATM and ISDN. Available WAN interfaces include the asynchronous serial interface, synchronous serial interface, ATM interface, ISDN BRI interface, and CE1/PRI For more information about ATM interfaces, see "Configuring ATM interfaces." Configuring a serial interface Asynchronous serial interface The following types of asynchronous serial interfaces are available: Synchronous/asynchronous serial interface operating in asynchronous mode. The interface type name is Serial. Dedicated asynchronous serial The interface type name is Async. You can connect a modem or ISDN terminal adapter to an asynchronous serial interface for dial-up connection. An asynchronous serial interface can operate in protocol or flow mode. Protocol mode Data is transmitted in packets. The link layer protocol can only be PPP. The network layer protocol is typically IP. Flow mode Data is transmitted as character flows. This mode is typically used in human-machine interaction scenarios such as dial-up access. After the physical connection is established, you can send commands to set up a link with the asynchronous serial interface, and then configure the device. Synchronous serial interface Synchronous serial interfaces refer to synchronous/asynchronous serial interfaces operating in synchronous mode. They provide serial communication channels for synchronous data transmission. The interface type name is Serial. A synchronous serial interface operates in DCE or DTE mode. Two directly connected synchronous serial interfaces must operate in different modes. In DCE mode, the interface provides timing for synchronization and sets the baud rate. In DTE mode, the interface accepts the timing signal and baud rate from the DCE. The synchronous serial interfaces on the device are typically operating as DTE. A synchronous interface can be connected to various types of cables, including V.24, V.35, X.21, RS449, and RS530. Typically, the device can automatically recognize the cable type and select electrical properties. The synchronous serial interface supports multiple data link layer protocols, including PPP and HDLC. The interface supports IP at the network layer. 14

20 Configuring an asynchronous serial interface This section only describes the interface properties configuration. Depending on the network requirements, you might also need to configure PPP, DDR, IP address, firewall, and interface backup. To configure an asynchronous serial interface: 1. Enter system view. system-view 2. Enter asynchronous serial interface view. 3. (Optional.) Set the interface description. 4. Configure a synchronous or asynchronous serial interface to operate as an asynchronous serial interface async interface-number or interface serial interface-number description text physical-mode async By default, the description of an asynchronous serial interface is interface name Interface, for example, Serial2/1/0 Interface. By default, a synchronous or asynchronous serial interface operates as a synchronous serial Skip this step if the interface is an asynchronous 5. Set the link layer protocol. link-protocol ppp The default is PPP. 6. Set the operating mode. async mode { flow protocol } The default is the protocol mode. 7. (Optional.) Enable level detection. 8. (Optional.) Enable local loopback. detect dsr-dtr loopback By default, level detection is enabled. By default, local loopback is disabled. 9. Set the MTU. mtu size The default is 1500 bytes. 10. Set the keepalive transmission interval. 11. (Optional.) Eliminate the pulses with a width less than μs. 12. Set the MRU for an interface operating in flow mode. 13. (Optional.) Set the intended bandwidth for the asynchronous serial 14. (Optional.) Restore the default settings for the asynchronous serial 15. Bring up the asynchronous serial timer-hold seconds eliminate-pulse phy-mru mrusize bandwidth bandwidth-value default undo shutdown The default is 10 seconds. By default, the pulses with a width less than μs are eliminated. The default MRU is 1700 bytes. By default, the expected bandwidth (in kbps) is the interface baud rate divided by By default, an asynchronous serial interface is up. 15

21 Configuring a synchronous serial interface This section only describes the interface properties configuration. Depending on the network requirements, you might also need to configure the data link layer protocol, DDR, IP address, firewall, and interface backup. To configure a synchronous serial interface: 1. Enter system view. system-view 2. Enter synchronous serial interface view. 3. Configure a synchronous or asynchronous serial interface to operate as a synchronous serial 4. (Optional.) Set the interface description. interface serial interface-number physical-mode sync description text By default, a synchronous or asynchronous serial interface operates as a synchronous serial By default, the description of a synchronous serial interface is interface name Interface, for example, Serial2/1/0 Interface. 5. Set the link layer protocol. link-protocol { hdlc ppp } The default is PPP. 6. Set the digital signal coding format. 7. Set the baud rate. 8. Set the clock selection mode. 9. (Optional.) Set transmit-clock or receive-clock signal inversion on the DTE side. code { nrz nrzi } baudrate baudrate virtualbaudrate virtualbaudrate On DTE side: clock { dteclk1 dteclk2 dteclk3 dteclk4 dteclk5 dteclkauto } On DCE side: clock { dceclk1 dceclk2 dceclk3 } invert { transmit-clock receive-clock } The default is non-return-to-zero (NRZ). The default is bps. Use the baudrate and virtualbaudrate commands at the DCE and DTE ends, respectively. The default is dceclk1 for the DCE side and dteclk1 for the DTE side. By default, clock signal inversion is disabled. 10. Set the MTU. mtu size The default is 1500 bytes. 11. Set the CRC mode. crc { none } The default is 16-bit CRC. 12. Set the number of interframe filling tags. 13. (Optional.) Enable level detection. 14. (Optional.) Enable data carrier detection (DCD). 15. (Optional.) Enable local loopback. itf number number detect dsr-dtr detect dcd loopback The default is four. By default, level detection is enabled. By default, DCD is enabled. By default, local loopback is disabled. 16

22 16. Configure the polling interval. timer-hold seconds The default is 10 seconds. 17. Set the line idle-code. idle-code { 7e ff } The default is 0x7E. 18. (Optional.) Enable RTS signal reverse. 19. (Optional.) Set the intended bandwidth for the synchronous serial 20. (Optional.) Restore the default settings for the synchronous serial 21. Bring up the synchronous serial reverse-rts bandwidth bandwidth-value default undo shutdown By default, RTS signal reverse is disabled. By default, the expected bandwidth (in kbps) is the interface baud rate divided by By default, a synchronous serial interface is up. Displaying and maintaining serial interfaces Execute display commands in any view and reset commands in user view. Task Display serial interface information. Display information about asynchronous serial interfaces. Command display interface [ serial [ interface-number ] ] [ brief [ description down ] ] display interface [ async [ interface-number ] ] [ brief [ description down ] Clear statistics for serial interfaces. reset counters interface [ serial [ interface-number ] ] Clear statistics for asynchronous serial interfaces. reset counters interface [ async [ interface-number ] ] Configuring an AM interface The analog modem (AM) interface combines the functionality of the asynchronous serial interface and analog modem. The AM interface supports most of the commands available on asynchronous serial interfaces and modems. When you configure an AM interface, you can treat it as a special asynchronous serial AM interfaces provide dial-in and dial-out services for analog dial-up users. The actual connect rates depend on the network conditions, including the line quality and connection protocol. The following are the maximum downstream and upstream rates that the AM interface can provide: If the peer (typically an ISP) uses a digital modem, the AM interface can use the V.90 Modem standard to set up connections. The maximum downstream rate is 56 kbps and the maximum upstream rate is 33.6 kbps. If the peer (typically a subscriber) uses an analog modem (or an AM interface), the AM interface can use the V.34 Modem standard to set up connections. The maximum downstream and upstream rates are both 33.6 kbps. 17

23 Configuration procedure The AM interface supports all commands available on the asynchronous interface and the modem, except for the modem auto-answer and baudrate commands. For more information about modem configuration, see Layer 2 WAN Configuration Guide. In addition, to set the baud rate for an AM interface, you must use the speed command in user line view. For more information, see Fundamentals Configuration Guide. This section only describes the interface properties configuration. Depending on the network requirements, you might also need to configure PPP, DDR, IP address, firewall, and interface backup. To configure an AM interface: 1. Enter system view. system-view 2. Enter AM interface view. 3. Set the coding format of the modem. 4. (Optional.) Set the interface description. interface analogmodem interface-number country-code area-name description text The default is united-states. For more information about this command, see Layer 2 WAN Command Reference. By default, the description of an AM interface is interface name Interface, for example, Analogmodem2/4/0 Interface. 5. Set the operating mode. async-mode { flow protocol } 6. (Optional.) Enable local loopback. loopback By default, an AM interface operates in flow mode. When an AM interface is operating in flow mode, no data link layer protocol is available. When operating in protocol mode, the AM interface uses PPP as the data link layer protocol. By default, local loopback is disabled. 7. Set the MTU. mtu size The default is 1500 bytes. 8. Set the keepalive transmission interval. 9. (Optional.) Eliminate the pulses with a width less than μs. 10. Set the MRU for an AM interface operating in flow mode. 11. (Optional.) Set the intended bandwidth for the AM timer-hold seconds eliminate-pulse phy-mru mrusize bandwidth bandwidth-value The default is 10 seconds. By default, the pulses with a width less than μs are eliminated. The default MRU is 1700 bytes. By default, the expected bandwidth (in kbps) is the interface baud rate divided by

24 12. (Optional.) Restore the default settings for the AM default 13. Bring up the AM undo shutdown By default, an AM interface is up. Displaying and maintaining AM interfaces Execute the display command in any view and the reset command in user view. Task Display AM interface information. Clear statistics for AM interfaces. Command display interface [ analogmodem [ interface-number ] ] [ brief [ description down ] ] reset counters interface [ analogmodem [ interface-number ] ] Configuring an ISDN BRI interface Integrated services digital network (ISDN) provides all-digital terminal-to-terminal services and fulfills the fully digitized delivery of services integrating voice, data, graphics, and video. ISDN implements digital transmission on a user loop and provides end-to-end digitization. As a standardized digital interface, ISDN BRI interface can forward digital and analog information. The most commonly used ISDN standards include ITU-T I.430, Q.921, and Q.931 recommendations. All devices that meet ITU-T ISDN standards can access an ISDN network. ITU-T I.411 standardizes the ISDN user-network interface and provides a reference configuration for ISDN access. As shown in Figure 2, the reference configuration contains the following elements: Function groups Sets of functions required for accessing an ISDN network. Network terminal 1 (NT1) Implements the functionality of the first layer in the OSI reference model, such as subscriber-line transmission, loop test, and D-channel competition. Network terminal 2 (NT2) Implements the functionality of layers 1 through 3. NT2 is also known as the intelligent network terminal. Category-1 terminal equipment (TE1) User equipment compliant with the ISDN interface provisions. TE1 is also known as the ISDN standard terminal. Digital phone-set is an example of TE1. Category-2 terminal equipment (TE2) User equipment incompliant with the ISDN interface provisions. TE2 is also known as non-isdn standard terminal equipment. Terminal adapter (TA) Provides adaptation for TE2 to access a standard ISDN Reference points Points used to differentiate function groups. R Reference point between a non-isdn equipment and TA. S Reference point between a user terminal and NT2. T Reference point between NT1 and NT2. U Reference point between NT1 and line terminal. 19

25 Figure 2 Referential ISDN user-network interface configuration Configuration prerequisites Before you configure an ISDN BRI interface, verify the following items: Interface type (ISDN BRI U or ISDN BRI S/T) provided by your telecom service provider You must identify this information before you purchase a router. You must perform this task because the UNI implementation of a service provider might deviate from ITU-T I.411. Availability of digital service The router requires digital transmission. You must subscribe to the digital call service for an ISDN line. Connection type (point-to-point or point-to-multipoint) Because ISDN supports semi-permanent connections, you can use an ISDN leased line to connect two permanent points. To connect more than two points, use a point-to-multipoint connection. Availability of the calling line identification function This function can filter calling numbers on an ISDN line to block unauthorized users from the router. Configuration procedure ISDN BRI interfaces are used for dialup purposes. For more information about dial-up configuration, see Layer 2 WAN Configuration Guide. To configure an ISDN BRI interface: 1. Enter system view. system-view 2. Enter ISDN BRI interface view. interface bri number 3. (Optional.) Configure the interface description. 4. (Optional.) Enable external loopback on the ISDN BRI 5. Set the MTU for the BRI 6. Set the keepalive transmission interval. description text loopback { b1 b2 both } mtu size timer-hold seconds By default, the description of an interface is interface-name Interface, for example, Bri2/4/0 Interface. By default, external loopback is disabled on the ISDN BRI The default is 1500 bytes. The default is 10 seconds. 20

26 7. Set the intended bandwidth for the BRI 8. (Optional.) Restore the default settings for the BRI 9. (Optional.) Bring up the BRI 10. (Optional.) Activate the BRI bandwidth bandwidth-value default undo shutdown activate By default, the expected bandwidth (in kbps) is the interface baud rate divided by By default, a BRI interface is up. By default, a BRI interface is not activated. By default, a BRI interface is active only when a call is present. Displaying and maintaining ISDN BRI interfaces Execute the display command in any view and the reset command in user view. Task Display information about ISDN BRI interfaces. Command display interface [ bri [ interface-number ] ] [ brief [ description down ] ] Clear statistics for ISDN BRI interfaces. reset counters interface [ bri [ interface-number ] ] Configuring a CE1/PRI interface There are two TDM systems in the data communications system: E1 system Recommended by ITU-T and widely used in Europe and China. T1 system Recommended by ANSI and widely used in North American and Japan. (Japan uses the J1 system. However, the J1 system is considered a T1 system because of their similarity.) A CE1/PRI interface can operate in either E1 mode (also called non-channelized mode) or CE1/PRI mode (also called channelized mode). In E1 mode, a CE1/PRI interface provides Mbps of data bandwidth. In CE1/PRI mode, a CE1/PRI interface is physically divided into 32 timeslots numbered 0 to 31. Timeslot 0 is used to transmit synchronizing information. This interface can be used as either a CE1 interface or a PRI When this interface operates as a CE1 interface, you can randomly bundle all timeslots except for timeslot 0 into multiple channel sets. For each channel set, a synchronous serial interface is created automatically. When the interface operates as a PRI interface, timeslot 16 is used as the D channel to transmit signaling. Except for timeslots 0 and 16, all other timeslots can be bundled together with timeslot 16 to form a PRI set. For the PRI set, an ISDN PRI interface is created automatically. 21

27 Configuring a CE1/PRI interface in E1 mode 1. Enter system view. system-view 2. Enter CE1/PRI interface view. controller e1 number 3. Configure the interface to operate in E1 mode. 4. (Optional.) Configure the interface to perform alarm indication signal (AIS) test. 5. (Optional.) Set other interface parameters. using e1 detect-ais See "Configuring other CE1/PRI interface parameters." By default, a CE1/PRI interface operates in CE1/PRI mode. Optional. By default, AIS test is performed. After you configure the CE1/PRI interface to operate in E1 mode, the system automatically creates a serial interface numbered serial interface-number:0. This interface has the same logical features as a standard synchronous serial interface and supports the following configurations: Data link protocols, such as PPP and HDLC. IP addressing. Interface backup settings if the interface is used as a primary or backup NAT and packet filtering if a firewall is to be set up. Configuring a CE1/PRI interface in CE1 mode 1. Enter system view. system-view 2. Enter CE1/PRI interface view. controller e1 number 3. Configure the interface to operate in CE1/PRI mode. 4. Bundle timeslots on the interface into a channel set. using ce1 channel-set set-number timeslot-list list The default operating mode is CE1/PRI mode. By default, no channel set is created. The timeslots on a CE1/PRI interface can be bundled into either channel sets or a PRI set, but not the both at the same time. 5. Set the framing format. frame-format { crc4 no-crc4 } The default is no-crc4. 6. (Optional.) Enable RAI detection on the 7. (Optional.) Set other interface parameters. alarm-detect rai See "Configuring other CE1/PRI interface parameters." By default, RAI detection is enabled on the A CE1/PRI interface in CE1/PRI mode can operate as a CE1 You can bundle timeslots on a CE1/PRI interface into up to 31 channel sets. 22

28 For each channel set, the system automatically creates a serial interface numbered serial interface-number:set-number. This interface has the same logical features as a standard synchronous serial interface and supports the following configurations: Data link protocols, such as PPP and HDLC. IP addressing. Interface backup settings if the interface is used as a primary or backup NAT and packet filtering if a firewall is to be set up. Configuring a CE1/PRI interface in PRI mode 1. Enter system view. system-view 2. Enter CE1/PRI interface view. controller e1 number 3. Configure the interface to operate in CE1/PRI mode. 4. Bundle timeslots on the interface into a PRI set. 5. (Optional.) Set other interface parameters. using ce1 pri-set [ timeslot-list list ] See "Configuring other CE1/PRI interface parameters." The default operating mode is CE1/PRI mode. By default, no PRI set is created. The timeslots on a CE1/PRI interface can be bundled into either channel sets or a PRI set, but not both at the same time. A CE1/PRI interface in CE1/PRI mode can operate as a PRI You can create only one PRI set on this type of For the PRI set, the system automatically creates a serial interface numbered serial interface-numbe:15. This interface has the same logical features as an ISDN PRI interface and supports the following configurations: DDR. PPP and PPP authentication. IP addressing. Interface backup settings if the interface is used as a primary or backup Firewall. Configuring other CE1/PRI interface parameters 1. Enter system view. system-view 2. Enter CE1/PRI interface view. controller e1 number 3. Configure the interface description. description text By default, the description of an interface is interface-name Interface. 23

29 4. Set the line code format. code { ami hdb3 } The default is high density bipolar 3 (HDB3). 5. Enable or disable user data inversion. data-coding { inverted normal } By default, user data inversion is disabled. 6. Set the cable type. cable { long short } 7. Set the clock mode. clock { master slave } The default cable setting is long mode. The default clock mode is slave, which is line clock. 8. Enable automatic clock mode change. clock-change auto By default, automatic clock mode change is disabled. 9. Set the line idle code type. Idle-code { 7e ff } The default is 0x7E. 10. Set the type and the number of interframe filling tags. 11. Set the loopback mode. 12. Restore the default settings for the CE1/PRI 13. Bring up the CE1/PRI itf { number number type { 7e ff } } loopback { local payload remote } default undo shutdown By default: The type of the interframe filling tag is 0x7E. The number of interframe filling tags is four. By default, loopback is disabled. Optional. By default, a CE1/PRI interface is up. 14. Return to system view. quit 15. Enter the view of the synchronous serial interface created on the CE1/PRI interface serial interface-number:set-number or interface serial interface-number: Set the CRC mode crc { none } By default, 16-bit CRC is adopted. Displaying and maintaining CE1/PRI interfaces Execute display commands in any view and the reset command in user view. Task Command Display information about CE1/PRI interfaces. display controller e1 [interface-number ] Display information about a channel set or PRI set. display interface serial interface-number:set-number Clear statistics for CE1/PRI interfaces. reset counters controller e1 [ interface-number ] 24

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