Software Configuration of ATM ISE Line Cards for Cisco Series Routers

Transcription

1 Software Configuration of ATM ISE Line Cards for Cisco Series Routers This feature module describes the software configuration for the Cisco 4-Port ATM Internet Services Engine (ISE) line cards in the Cisco Series Router. The line card comes in two variations: OC-12c/STM-4c and OC-3c/STM-1; otherwise, the features are the same on both cards. Feature History for the 4-Port ATM ISE Line Card Release 12.0(25)S 12.0(26)S2 12.0(27)S1 Modification The 4-Port OC-12c/STM-4c ATM ISE line card was introduced. The 4-Port OC-3c/STM-1 ATM ISE line card was integrated into 12.0(26)S. The 4-Port OC-3c/STM-1 ATM ISE line card was introduced. AToM, Layer 2/Layer 3 features on a single port and enhanced QoS policing features were introduced. Finding Support Information for Platforms and Cisco IOS Software Images Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear. Contents Prerequisites for the 4-Port ATM ISE Line Card, page 2 Restrictions for the 4-Port ATM ISE Line Card, page 2 Information About the 4-Port ATM ISE Line Card, page 3 How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card, page 5 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card, page 8 How to Configure AToM VCs on the 4-Port ATM ISE Line Card, page 35 Troubleshooting ATM Errors on the 4-Port ATM ISE Line Card, page 76 Corporate Headquarters: Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA USA Copyright 2004 Cisco Systems, Inc. All rights reserved.

2 Prerequisites for the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Configuring Modular QoS CLI, page 84 Additional References, page 91 Command Reference, page 92 Glossary, page 98 Prerequisites for the 4-Port ATM ISE Line Card There are no prerequisites for using the 4-port ATM ISE line card. Restrictions for the 4-Port ATM ISE Line Card Restrictions and limitations for the 4-Port ATM ISE line cards are listed in Table 1 and Table 2. Table 1 Supported Values for 4-Port ATM ISE Line Card Feature Maximum number of cell packing or policing VCs 1 Maximum number of active VCs 3 : Layer 2 Layer 3 Range of VPI 5 values Range of VCI 6 values Limitation 508 per port per port and card per port and card Varies with vc-per-vp value. In Release 12.0(25)S: up to 255 In Release 12.0(27)S: UNI VPIs up to 255; NNI VPIs up to 4095 Varies with vc-per-vp value, up to 65, VC=virtual circuit. 2. Hardware limitation. 3. Subject to overall system limitation and configuration. 4. If cell packing or policing are configured, the remaining 516 available VCs can be configured for cell relay over MPLS or AAL5 over MPLS. 5. VPI=virtual path identifier. 6. VCI=virtual channel identifier. Table 2 Scalability Limitations for the 4-Port ATM ISE Line Card Layer 2 Feature Limitation Maximum number of AToM Tunnels per port 1024 Maximum number of AToM Tunnels per line card 1024 Maximum number of AToM Tunnels per router 2048 Maximum number of AToM Tunnels per port with features Maximum number of AToM Tunnels per port with cell packing 508 2

3 Software Configuration of ATM ISE Line Cards for Cisco Series Routers Information About the 4-Port ATM ISE Line Card Table 2 Scalability Limitations for the 4-Port ATM ISE Line Card (continued) Feature Maximum number of AToM Tunnels per line card with features Maximum number of AToM Tunnels per line card with cell packing Includes features such as policing Layer 2 Limitation Information About the 4-Port ATM ISE Line Card The 4-Port ATM ISE line cards, which deliver line rate OC-12c/STM-4c or OC-3c/STM-1 bandwidth, provide enhanced Layer 2 and Layer 3 capabilities for high-speed customer aggregation, backbone connectivity, and peering solutions. These cards perform traffic shaping and per-virtual circuit (VC) queueing, and support per-vc Modified Deficit Round Robin (MDRR) with per-vc low latency queueing (LLQ). They also support Any Transport over MPLS (AToM), enhanced traffic policing, and the ability to configure both AToM VCs and terminated VCs on a single port. MDRR is implemented on a per-vc basis with up to eight queues per VC, where one of the queues is a low latency queue (LLQ). Both per-vc Weighted Random Early Detection (WRED) and per-vc MDRR are performed in the hardware. The 4-Port OC-12c/STM-4c ATM ISE line card provides the Cisco Series Router with four 622-Mbps ATM interfaces. The 4-Port OC-3c/STM-1 ATM ISE line card provides four 155-Mbps ATM interfaces. The cards communicate with the Cisco Series Router switch fabric. Features of the 4-Port ATM ISE Line Card The following are the features supported by the 4-Port ATM ISE line cards: Traffic shaping on a per-vc and per-virtual path (VP) basis with a minimum granularity of 1 Kbps, in compliance with I.371 granularity definition. Per-VC queueing using configurable per-vc queue limits or per-vc WRED. A VC address can be any of the virtual path identifier (VPI) and virtual channel identifier (VCI) range. User-network interface (UNI) VPIs can be in the range of ; network-to-network interface (NNI) VPIs can be in the range of VCIs can be in the range 0..65,535. Per-VC statistics through hardware. Per-port statistics through hardware. AAL5 [I.362] [I.363] reassembly and segmentation. Non-real-time variable bit rate (VBR-nrt) and real time variable bit rate (VBR-rt) traffic shaping with 99+ percent shaping accuracy. Constant bit rate (CBR) traffic shaping with 99+ percent shaping accuracy. Unspecified bit rate (UBR) with support for optional peak cell rate (PCR) parameter with 99+ percent shaping accuracy. VP tunnel traffic shaping for the full range of VPI on UNI interfaces up to 256 VP tunnels per port. Maximum transmission unit (MTU) of up to 9180 bytes. Each VC supports up to 9K MTU. 3

4 Information About the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers F4 and F5 flows of operation, administration, and maintenance (OAM) cells and OAM management specified as requirements by [UNI 3.x] [I.610]. Layer 3-Specific Features Layer 2-Specific Features Supports up to 2047 traffic-shaped VC connections per interface. 1 Bidirectional OC-12c/STM-4c line rate for 64-byte packets (two cells) on all four ports. This is an aggregate line rate of approximately 2.8 million packets per second. Bidirectional OC-3c/STM-1 full line rate for any packet size on all four ports. Support for up to 120 distinct WRED profiles per interface. These profiles are configurable using Cisco IOS software. ATM VC bundle management. MPLS Traffic Engineering (TE), including Single Area (OSPF,ISIS), DS-TE (OSPF,ISIS), Autobandwidth, TE Metrics (OSPF,ISIS), TE Node Exclusion (OSPF,ISIS), Multiarea (OSPF,ISIS). Support for thousands of ACL/xACL entries, including both ingress and egress for interfaces and subinterfaces. Committed Access Rate (CAR), including CAR action continue, including both ingress and egress for interfaces and subinterfaces. Policy-based routing (PBR) for interfaces and subinterfaces. Border Gateway Protocol (BGP) policy accounting. Unicast reversepath forwarding (urpf) loose mode. Sophisticated MQC classifications based on IP ACL/xACL, IP precedence/dscp, MPLS EXP, QoS groups, and more. IP and MPLS traffic marking QoS Policy Propagation via BGP (QPPB) Ingress IP-based traffic shaping. Netflow, including sampled ingress/egress Netflow, aggregated Netflow, and MPLS-aware Netflow. High Availability, including route processor redundancy (RPR), RPR+, and Stateful Switchover (SSO). ATM OAM F5 continuity check. MPLS virtual private network (VPN). UNI 3.x and Interim Local Management Interface (ILMI). Switched virtual circuit (SVC) support for point-to-point and point-to-multipoint connections. Multicast packet replication. ATM cell loss priority (CLP) bit setting. MPLS VPN Inter-AS. MPLS VPN carrier supporting carrier (CsC). Supports up to 2047 traffic-shaped VC connections per interface Subject to overall system limitation and configuration. 4

5 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card Any Transport over Multiprotocol Label Switching (MPLS) [AToM]. ATM OAM Emulation Cell-based policing Experimental bit marking Cell packing for port, VC, and VP modes Cell relay for port, VC, and VP modes How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card The 4-port ATM ISE line cards provide the ability to configure Layer 2 AToM VCs as well as Layer 3 terminated VCs. On any individual ATM interface, you can configure both AToM VCs and terminated VCs as required. The configurations of these are discussed in subsequent sections in this document. This section provides basic ATM interface configuration information and discusses those features that are applicable to both AToM VCs and terminated VCs. Configuring ATM interfaces and virtual circuits is described in the following sections: Configuring an ATM Interface, page 5 Configuring UNI and NNI Cell Support, page 7 Troubleshooting Tips, page 7 Configuring an ATM Interface Use the show running-config command to display current port configuration information. On power up, the interface on a new 4-Port ATM ISE line card is shut down. To enable the interface, you must enter a no shutdown command in configuration mode. Default Interface Configuration When the 4-Port ATM ISE line card is enabled (taken out of shutdown) with no additional configuration commands applied, the default interface configuration file parameters, described in Table 3, are used. Table 3 4-Port ATM ISE Line Card Default Configuration Values Parameter Configuration File Entry Default Value Maximum transmission unit (MTU) [no] mtu bytes 4470 bytes Maximum numbers of virtual circuits [no] atm maxvc numvc 2047 Loopback [no] loopback [diagnostic line] no loopback Internal clock [no] atm clock internal no atm clock internal SONET framing [no] atm sonet stm-4 no atm sonet stm-4 2. Subject to overall system limitation and configuration. 5

6 How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Configuration Basics SUMMARY STEPS DETAILED STEPS After you verify that the new 4-Port ATM ISE line card is installed correctly, use the configure command to configure the new interface. Be prepared with the information that you will need, such as the interface IP address. The Cisco Series Router identifies an interface address by its line card slot number and port number, in the format slot/port. Because each 4-Port ATM ISE line card contains four ATM interfaces, the port numbers are 0 to 3. For example, the slot/port address of an ATM interface on a 4-Port ATM ISE line card installed in line card slot 2 is 2/0 to 2/3. Use the following procedure to create a basic configuration, including enabling an interface and specifying IP routing. You might also need to enter other configuration subcommands, depending on the requirements for your system configuration. (For descriptions of configuration subcommands and the configuration options available, refer to the appropriate software publications in the Related Documents section on page 91.) 1. show version 2. show interfaces 3. enable 4. configure terminal 5. interface atmslot/port 6. no shutdown 7. Ctrl-Z 8. copy running-config startup-config Step 1 show version Confirm that the system recognizes the line card. Step 2 show interfaces Check the status of each port on the line card. Step 3 Step 4 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 5 Router# configure terminal interface atmslot/port Router(config)# interface atm1/3 Enter interface configuration mode for the specified ATM interface. 6

7 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card Step 6 no shutdown Change the state of the interface to up and enable the interface. Router(config-if)# no shutdown Step 7 Press Ctrl-Z Exit configuration mode. Perform this after completing all desired configuration commands on the interface or subinterface. Step 8 copy running-config startup-config Write the new configuration to memory. Configuring UNI and NNI Cell Support You can designate that the cell format for an interface be either User Network Interface (UNI) or Network Node Interface (NNI). The default setting is UNI. Use the atm maxvpi-bits command to change the maximum VPI range from (UNI) to (NNI). Router(config)# interface atm 2/2 Router(config-if)# atm maxvip-bits 12 To change the interface setting back to NNI, use the no form of this command: no maxvip-bits 12. This configuration should be entered before the connection is added. Troubleshooting Tips To verify the operation of the interfaces configured on the 4-Port ATM ISE line card, use the following commands: Command Router# show version Router# show gsr Router# show interfaces atm slot/port Router# show running-config Displays the configuration of the system hardware, the software release, the names and sources of configuration files, and the boot images. Verify that the list includes the newly configured 4-Port ATM ISE line card ports and interfaces. Displays information about the hardware modules installed in the Cisco Series Router. Displays information about the ATM interfaces. For example, to display information about slot 2, port 0, enter: Router# show interfaces atm2/0 Displays information about the currently running configuration in RAM. To display information about the current state of the ATM network, use the following commands: 7

8 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Command Router# show atm interface atm slot/port Router# show atm traffic Displays current ATM-specification information about the 4-Port ATM ISE line card interface. Displays current ATM statistics. How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card The following configuration tasks are described in this section: Configuring Layer 3 Terminated Virtual Circuits, page 8 Configuring ATM Shaping on Terminated VCs, page 9 Configuring OAM Management on Terminated VCs, page 11 Configuring Quality of Service on Terminated VCs, page 14 Configuring and Managing VC Bundles, page 28 Configuring Bridged PVCs, page 35 Configuring Layer 3 Terminated Virtual Circuits A virtual circuit (VC) is a point-to-point connection between two ATM devices. A VC is established for each ATM end node with which the router communicates. The characteristics of the VC are established when it is created and include the following for the 4-Port ATM ISE line cards: Quality of service (QoS) ATM adaptation layer (AAL) mode Encapsulation type (LLC/SNAP, IP MUX, and NLPID) Peak and average transmission rates Permanent virtual circuits (PVCs) configured on the router remain active until the circuit is removed from the configuration. All virtual circuit characteristics apply to PVCs. When a PVC is configured, all configuration options are passed to the 4-Port ATM ISE line card. These PVCs are written to the nonvolatile RAM (NVRAM) as part of the configuration and are used when the Cisco IOS image is reloaded. When you create a PVC, you create a virtual circuit descriptor (VCD) and attach it to the VPI and VCI. The VCD tells the card which VPI/VCI to use for a particular packet. The 4-Port ATM ISE line card requires this feature to manage the packets for transmission. The number chosen for the VCD is independent of the VPI/VCI used. A permanent virtual path (PVP) is like a bundle of VCs, transporting all cells with a common VPI, rather than a specific VPI and VCI. PVCs are created and configured using the pvc command in interface configuration mode. PVPs are created and configured using the atm pvp command in interface configuration mode. The syntax of the pvc command is as follows: pvc [name] vpi/vci 8

9 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card The syntax of the atm pvp command is: atm pvp vpi vpi is the ATM network VPI to use for this virtual circuit, in the range of 0 to 255 for UNI or 0 to 4095 for NNI; vci is the ATM network VCI to use for this virtual circuit, in the range of 0 to 655,535. Troubleshooting Tips To display information about the connected virtual circuits, use the following commands: Command Router# show atm pvc Router# show atm vc Displays current ATM PVC information. Displays current ATM VC information. Configuring ATM Shaping on Terminated VCs The 4-Port ATM ISE line cards support IP traffic shaping on terminated VCs. The following ATM shaping options are available: Constant bit rate (CBR) Supports real-time applications that request a static amount of bandwidth that is continuously available for the duration of the connection. (See Step 5.) Real-time variable bit rate (VBR-rt) Supports real-time applications that have bursty transmission characteristics. (See Step 6.) Non-real-time variable bit rate (VBR-nrt) Supports non-real-time applications with bursty transmission characteristics that tolerate high cell delay, but require low cell loss. (See Step 7.) Unspecified bit rate (UBR) Supports non-real-time applications that tolerate both high cell delay and cell loss on the network. There are no network service-level guarantees for the UBR service category, and therefore it is a best-effort service. (See Step 8.) To configure ATM shaping, perform the shaping commands in PVC mode. You should use only one of the shaping commands in Step 5 through Step 8, depending on the type of shaping to be configured. Restrictions CDVT When traffic shaping is configured on a VC, the cell delay variation (CDV) is set for the VC. This value will change according to the shaping class defined. The cell delay variation tolerance (CDVT) values are shown in Table 4. Table 4 CDVT per Traffic Class for Traffic Shaping Traffic Class OC-12c/STM-4c Line Card OC-3c/STM-1 Line Card CBR 70 μsec 70 μsec UBR 185 μsec 305 μsec VBR-RT 70 μsec 70 μsec VBR-NRT 185 μsec 305 μsec 9

10 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Note For VBR connections in which the sustainable cell rate (SCR) is not equal to the PCR value, the CDVT is significantly lower. Decreased VC Throughput If you configure a VC on a 4-Port OC-12/STM-4 ATM ISE interface with a peak cell rate (PCR) or sustainable cell rate (SCR) greater than OC-6 (using the ubr, vbr-nrt, vbr-rt, or cbr commands), and attach a traffic policy with MDRR (configured using the bandwidth command) to the interface for specified traffic classes, when traffic on the interface from the specified classes is equal to or greater than the configured PCR or SCR values, frequent queueing and dequeueing changes occur between the MDRR queues and may cause a decreased VC throughput. Decreased throughput is more likely to occur when the traffic consist of small packets and when a high amount of traffic is sent toward the high-priority queue. Such traffic will increase significantly the frequency of switches between queues, which may cause the nonpriority queues to lose their bandwidth. Therefore, when configuring a VC to more than OC-6, it is recommended to limit the high priority traffic using the police command. SUMMARY STEPS Use either Step 5, Step 6, Step 7 or Step 8 depending on the desired shaping. 1. enable 2. configure terminal 3. interface atmslot/port.subinterface 4. pvc vpi/vci 5. cbr pcr 6. vbr-rt pcr scr 7. vbr-nrt pcr scr 8. ubr pcr DETAILED STEPS Step 1 Step 2 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Router# configure terminal interface atmslot/port.subinterface Router(config)# interface atm1/0.2 Specifies an ATM interface or subinterface to configure. Configure subinterfaces so that you can take advantage of access list definitions for the IP traffic. 10

11 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Step 4 Step 5 pvc [name] vpi/vci Router(config-if)# pvc 0/100 cbr pcr Router(config-if-vc)# cbr Specifies a PVC with the specified VPI and virtual circuit identifier (VCI). Specifies CBR shaping. The pcr value indicates the peak cell rate. The range is from 38 to 622,000 Kbps. Step 6 Step 7 Step 8 vbr-rt pcr scr burst Router(config-if-vc)# vbr-rt vbr-nrt pcr scr mbs Router(config-if-vc)# vbr-nrt ubr pcr Router(config-if-vc)# ubr Note Use either Step 5, Step 6, Step 7, or Step 8. Specifies VBR-rt shaping. The pcr value indicates the peak cell rate, and its range is from 38 to 622,000 Kbps. The scr value indicates the sustainable cell rate, and its range is from 38 to pcr Kbps. The burst value indicates the burst size, in number of cells. Specifies VBR-nrt shaping. The pcr value indicates the peak cell rate, and its range is from 38 to 622,000 Kbps. The scr value indicates the sustainable cell rate, and its range is from 38 to pcr Kbps. The mbs value indicates the maximum burst size, in number of cells. Specifies UBR shaping. The pcr value indicates the peak cell rate, and its range is from 38 to 622,000 Kbps. Configuring OAM Management on Terminated VCs SUMMARY STEPS OAM may be enabled for PVC or SVC management on terminated VCs. To configure OAM management for an ATM Layer 3 PVC, perform the following procedure. 1. enable 2. configure terminal 3. interface atmslot/port.subinterface [point-to-point multipoint] 4. pvc vpi/vci 5. oam-pvc manage 6. oam retry up-count down-count retry-frequency 7. oam-pvc manage cc {end segment} [direction {both sink source}] [keep-vc-up [end aisrdi failure seg aisrdi failure]] 8. oam retry cc {end segment} [activation-count [deactivation-count [retry-frequency]]] 11

12 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers DETAILED STEPS Step 1 Step 2 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Router# configure terminal interface atmslot/port.subifnum {point-to-point multipoint} Specify the new ATM subinterface to configure. Router(config)# interface atm1/3.2 point-to-point Step 4 pvc [name] vpi/vci Specify an ATM PVC. Step 5 Router(config-subif)# pvc 10/50 oam-pvc manage [frequency] Enable OAM management. Step 6 Router(config-if-atm-vc)# oam-pvc manage oam retry up-count down-count retry-frequency Router(config-if-atm-vc)# oam retry (Optional) Specify OAM management parameters for re-establishing and removing a PVC connection. Use the up-count argument to specify the number of consecutive end-to-end F5 OAM loopback cell responses that must be received in order to change a PVC connection state to up. Use the down-count argument to specify the number of consecutive end-to-end F5 OAM loopback cell responses that are not received in order to tear down a PVC. Use the retry-frequency argument to specify the frequency (in seconds) at which end-to-end F5 OAM loopback cells should be transmitted when a change in UP/DOWN state is being verified. For example, if a PVC is up and a loopback cell response is not received after the frequency (in seconds) specified using the oam-pvc command, then loopback cells are sent at the retry-frequency to verify whether or not the PVC is down. 12

13 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Step 7 oam-pvc manage cc {end segment} [direction {both sink source}] [keep-vc-up [end aisrdi failure seg aisrdi failure]] Configures ATM OAM F5 continuity check (CC) management to detect connectivity failures at the ATM layer. Step 8 Router(config-if-atm-vc)# oam-pvc manage cc segment direction source oam retry cc {end segment} [activation-count [deactivation-count [retry-frequency]]] Configures the retry count and the frequency at which CC activation and deactivation requests are sent to the device at the other end of the PVC or the segment. Router(config-if-atm-vc)# oam retry cc segment OAM Management By default, end-to-end F5 OAM loopback cell generation is turned off for each PVC. A PVC is determined as down when any of the following is true on that PVC: The router does not receive a loopback reply after a configured number of retries of sending end-to-end F5 OAM loopback cells. The router receives a Virtual Circuit-Alarm Indication Signal (VC-AIS) cell. The router receives a Virtual Circuit-Remote Detect Indicator (VC-RDI) cell. A PVC is determined as up when all the following are true on that PVC: The router receives a configured number of successive end-to-end F5 OAM loopback cell replies. The router does not receive VC-AIS cell for 3 seconds. The router does not receive VC-RDI cell for 3 seconds. Note the following regarding OAM management: When OAM management is not enabled, loopback (LB) cells received by the PVC are looped back to the sender, and for any received F4/F5-AIS, F4/F5-RDI cells are transmitted via this PVC, but the PVC state is not changed. The 4-Port ATM ISE line card supports OAM management enabled mode for the entire range of VCs supported, while using the default frequency of 10 seconds on all VCs. The minimum OAM LB cell frequency of 1 second is currently permitted over no more then 50 PVCs (chassis performance limitation), and the default interval of 10 seconds is used for the rest of the PVCs. OAM F5 Continuity Check The 4-Port ATM ISE line card also provides OAM support for the use of F5 segment and end-to-end continuity check (CC) cells to detect connectivity failures at the ATM layer. It also generates various Simple Network Management Protocol (SNMP) notifications when CC cells indicate virtual circuit (VC) connectivity failure ATM OAM F5 CC cells provide an in-service tool optimized to detect connectivity problems at the VC level of the ATM layer. CC cells are sent between a router designated as the source location and a router designated as the sink location. The local router can be configured as the source, the sink, or both. 13

14 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers The 4-Port ATM ISE line card implements two types of OAM cells: CC cells for fault management and CC cells for activation and deactivation. Fault management cells detect connectivity failures. Activation and deactivation cells initiate the activation or deactivation of continuity checking. Configuring Quality of Service on Terminated VCs Configuring Traffic Policing SUMMARY STEPS Quality of Service (QoS) on terminated VCs is configured using the Modular QoS CLI (MQC). MQC allows users to create traffic policies and attach these policies to interfaces. A traffic policy contains a traffic class and one or more QoS features. A traffic class is used to classify traffic, and the QoS features in the traffic policy determine how to treat the classified traffic. To configure and enable QoS on terminated VCs, you must define a traffic class, create a traffic policy, and attach this traffic policy to the PVC. See the Configuring Modular QoS CLI section on page 84 for detailed instructions on how to complete these tasks. The following tasks use the MQC to configure QoS on terminated VCs: Configuring Traffic Policing, page 14 Configuring a Per-VC Queue Limit, page 16 Configuring Per-VC WRED, page 18 Configuring Per-VC MDRR and Low Latency Queueing, page 20 Configuring the set Commands, page 23 Troubleshooting Tips, page 27 This task describes how to configure traffic policing using the MQC. Traffic policing can be configured for either ingress or egress traffic. This task illustrates the use of the match access-group command. For information on other match options, refer to the Configuring Modular QoS CLI section on page 84. When traffic policing is configured, packets coming into interface are evaluated by the token bucket algorithm to determine whether they conform to or exceed the specified parameters. The conform-action, exceed-action, and violate-action parameters in the police command determine what is done with the packets. 1. enable 2. configure terminal 3. class-map class-map-name 4. match access-group access-group 5. exit 6. policy-map policy-name 7. class class-name 8. police bps burst-normal burst-max conform-action action exceed-action action violate-action action 9. exit 14

15 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card 10. exit 11. interface atmslot/port.subifnum 12. pvc vpi/vci 13. service-policy {input output} policy-name DETAILED STEPS Step 1 Step 2 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Router# configure terminal class-map class-map-name Specifies the user-defined name of the traffic class. Step 4 Router(config)# class-map acgroup2 match access-group access-group Router(config-cmap)# match access-group 2 Step 5 exit Exits class-map mode. Step 6 policy-map policy-name Specifies the numbered access list against whose contents packets are checked to determine if they belong to the class. Specifies the name of the traffic policy to configure. Step 7 Step 8 Router(config)# policy-map police class class-name Router(config-pmap)# class acgroup2 Router(config-pmap-c)# police bps burst-normal burst-max conform-action action exceed-action action violate-action action Specifies the name of a predefined class, which was defined with the class-map command, to be included in the traffic policy. Specifies a maximum bandwidth usage by a traffic class through the use of a token bucket algorithm. Router(config-pmap)# police conform-action transmit exceed-action set-qos-transmit 4 Step 9 exit Exits policy-map class mode. Step 10 exit Exits policy-map mode 15

16 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Step 11 interface atmslot/port.subifnum Specifies the ATM subinterface to configure. Step 12 Router(config)# interface atm1/0.1 pvc vpi/vci Specifies the ATM PVC to attach the traffic policy to. Step 13 Router(config-subif)# pvc 10/50 service-policy {input output} policy-name Attaches the traffic policy to the PVC. Router(config-if-atm-vc)# service-policy input police The command syntax of the police command allows you to specify the action to be taken on a packet when you enable the action keyword. The actions resulting from the keyword choices are listed in Table 5. Table 5 police Command Action Keywords Keyword drop set-clp-transmit set-discard-class-transmit new-class set-dscp-transmit dscp set-mpls-exp-imposition-transmit mpls-exp set-mpls-exp-topmost-transmit mpls-exp set-prec-transmit new-prec set-qos-transmit new-qos transmit Resulting Action Drops the packet. Sets the ATM CLP bit and sends the packet. This is supported for egress only. Sets the discard-class and sends the packet. This is supported for ingress on terminated VCs only. Sets the differentiated services code point (DSCP) value and sends the packet. Sets the experimental value at tag imposition and sends the packet. This is supported for ingress on terminated VCs only. Sets the experimental value on the topmost label and sends the packet. This is supported on terminated VCs only. Sets the IP precedence and sends the packet. Sets the QoS group and sends the packet. This is supported for ingress only. Sends the packet. Configuring a Per-VC Queue Limit Use this task to configure a per-vc queue limit on a single egress or ingress queue. Restrictions A queue limit cannot be configured together with WRED. 16

17 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card SUMMARY STEPS 1. enable 2. configure terminal 3. policy-map policy-name 4. class class-default 5. queue-limit cells cells (for egress queue) or queue-limit packets packets (for ingress queue) 6. exit 7. exit 8. interface atmslot/port.subifnum 9. pvc vpi/vci 10. service-policy {input output} policy-name DETAILED STEPS Step 1 Step 2 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Router# configure terminal policy-map policy-name Specifies the name of the traffic policy to configure. Step 4 Router(config)# policy-map qlimit1 class class-default Specifies to configure the default class. Step 5 Router(config-pmap)# class class-default queue-limit cells cells or queue-limit packets packets Specifies the maximum number of cells or packets queued for a traffic class that has a bandwidth configuration or class-default specified. Ingress queues are defined in packets and egress queues are defined in cells. Router(config-pmap-c)# queue-limit 576 cells Step 6 exit Exits policy-map class mode. Step 7 exit Exits policy-map mode. 17

18 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Step 8 interface atmslot/port.subifnum point-to-point Specifies the ATM subinterface to configure. Router(config)# interface atm4/0.1 Step 9 pvc vpi/vci Specifies the ATM PVC to attach the traffic policy to. Step 10 Router(config-subif)# pvc 4/11 service-policy {input output} policy-name Attaches the traffic policy to the PVC. Router(config-if-atm-vc)# service-policy output qlimit1 Configuring Per-VC WRED Restrictions SUMMARY STEPS Use this task to configure DSCP-based or precedence-based WRED on a VC. WRED can be configured on both ingress or egress queues, where ingress queues are defined in terms of packets and egress queues are defined in terms of cells. Random-detect cannot be configured on a class that has priority configured. No more than three different Random Early Detection (RED) profiles can be configured on one class of service (COS) queue. For precedence-based WRED use Step 7; for DSCP-based WRED use Step 8 or Step enable 2. configure terminal 3. policy-map policy-name 4. class class-name 5. random-detect 6. random-detect exponential-weighting-constant n 7. random-detect precedence precedence min-threshold {cells packets} max-threshold {cells packets} [mark-prob-denominator] 8. random-detect dscp-based 9. random-detect dscp dscpvalue min-threshold {cells packets} max-threshold {cells packets} [mark-probability-denominator] 10. exit 11. exit 12. interface atmslot/port.subifnum 18

19 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card DETAILED STEPS 13. pvc vpi/vci 14. service-policy output policy-name Step 1 Step 2 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Router# configure terminal policy-map policy-name Specifies the name of the traffic policy to configure. Step 4 Router(config)# policy-map wred-1 class class-name Specifies to configure the first class. Router(config-pmap)# class class1 Step 5 random-detect Enables a weighted random early detection (WRED) drop policy for a traffic class that has a bandwidth configuration or class-default specified. Step 6 random-detect exponential-weighting-constant n Configures a WRED exponential weighting constant on a per-cos-queue basis. Step 7 Router(config-pmap-c)# random-detect exponential-weighting-constant 10 random-detect precedence precedence min-threshold {cells packets} max-threshold {cells packets} [mark-prob-denominator] Router(config-pmap-c)# random-detect precedence cells 1100 cells 1 Specifies the minimum and maximum cell thresholds and, optionally, the mark-probability denominator for the precedence value. Specify cells for egress and packets for ingress. Note Use this step to configure precedence-based WRED. Step 8 random-detect dscp-based Indicates that WRED is to use the DSCP value when it calculates the drop probability for the packet. Note Use this step to configure DSCP-based WRED. 19

20 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Step 9 random-detect dscp dscpvalue min-threshold {cells packets} max-threshold {cells packets} [mark-probability-denominator] Router(config-pmap-c)# random-detect dscp cells 700 cells 1 Specifies the minimum and maximum cell thresholds and, optionally, the mark-probability denominator for the DSCP value. Specify cells for egress and packets for ingress. Note Use this step to configure DSCP-based WRED. Step 10 exit Exits policy-map class mode. Step 11 exit Exits policy-map mode. Step 12 interface atmslot/port.subifnum Specifies the ATM subinterface to configure. Router(config)# interface atm1/0.1 Step 13 pvc vpi/vci Specifies the ATM PVC to attach the policy map to. Step 14 Router(config-subif)# pvc 1/1 service-policy output policy-name Attaches the policy map to the PVC. Router(config-if-atm-vc)# service-policy output wred-1 Configuring Per-VC MDRR and Low Latency Queueing This task configures egress MDRR. Using egress MDRR, the 4-Port ATM ISE line card supports up to eight queues for classes of traffic per VC. One of the queues is always reserved for a special class called class-default. Up to seven of the classes are normal queues, including the class-default queue. The eighth class is always a low latency queue. The class, class-default, is always configured, and it consumes one of the eight queues. If not configured explicitly, it is configured implicitly. When the bandwidth command is used, at least 1 percent of traffic must be reserved for the class-default queue. All packets that do not match any user-defined class on the policy map are considered to belong to class-default, and therefore enter the default queue. The low latency queue, or priority queue, is also always created. All traffic sourced from the router (including ping traffic and multicast traffic) uses this queue, regardless of classification. Bandwidth percentages are converted into weights in units of ATM cells. The weights are internally proportioned such that the bandwidth is divided accurately among VCs. The following are recommendations for configuring per-vc MDRR on the 4-Port ATM ISE line card: Set the bandwidth to be at least 10 percent in each class. The default class, class-default, should also have at least 10 percent of the bandwidth allocation; therefore, you should ensure that the bandwidth allocated to all configured classes is less that 90 percent. 20

21 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Set the MTU as low as possible on each subinterface, using the ip mtu command, while still avoiding fragmentation. Fragmentation causes extreme performance degradation, because it is done in the slow path. Do not decrease the MTU to the point where it causes fragmentation. Note Changing MTU settings may cause all VCs on the interface or subinterface to be torn down and set back up. If none of the classes is a priority class, the maximum number of classes that can be configured with the bandwidth command, excluding the class-default class, is six. When class-default is not specified, at least 1 percent must be allocated to this class. If priority is not specified on any class, then any form of the bandwidth command can be used. If the priority command is configured without a police command (drop exceed-action), then the only form of the bandwidth command that is allowed on the other classes in the policy map is the bandwidth remaining command. If a police command is used on the priority queue, then all forms of the bandwidth commands are allowed. SUMMARY STEPS 1. enable 2. configure terminal 3. policy-map policy-name 4. class class-name 5. priority 6. class class-name 7. bandwidth remaining percent percent 8. class class-default 9. exit 10. exit 11. interface atmslot/port.subifnum 12. pvc vpi/vci 13. service-policy output policy-name DETAILED STEPS Step 1 Step 2 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Router# configure terminal 21

22 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Step 3 policy-map policy-name Specifies the name of the traffic policy to configure. Step 4 Router(config)# policy-map WRED-MDRR-POLICY-1 class class-name Specifies to configure the first class. Router(config-pmap)# class class1 Step 5 priority Specifies the class as the priority class. Step 6 class class-name Specifies to configure the second class. Router(config-pmap)# class class2 Step 7 bandwidth remaining percent percent Specifies a minimum bandwidth guarantee to a traffic class. Here the minimum bandwidth guarantee is based on the remaining bandwidth available. If there is no available Router(config-pmap-c)# bandwidth remaining bandwidth, the class will receive no bandwidth, regardless percent 50 of the percent specified. Step 8 class class-default Explicitly specifies to configure the default class. Step 9 exit Exits policy-map class mode. Step 10 exit Exits policy-map mode. Step 11 interface atmslot/port.subifnum Specifies the ATM subinterface to configure. Router(config)# interface atm1/0.1 Step 12 pvc vpi/vci Specifies the ATM PVC to attach the policy map to. Step 13 Router(config-subif)# pvc 1/1 service-policy output policy-name Attaches the policy map to the PVC. Router(config-if-atm-vc)# service-policy output WRED-MDRR-POLICY-1 Note If the class-default is not explicitly configured, it is implicitly configured. All remaining bandwidth is allocated to class-default. Note VCs with a configured bandwidth (using the bandwidth command) are limited to a peak cell rate (PCR) of 299,520 Kbps on the 4-Port OC-12c/STM-4c ATM ISE line card. 22

23 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Examples Following are additional examples of configuring MDRR: Configuring Per-VC MDRR and Low Latency Queueing with Queue Limits Configuring Per-VC MDRR and Policed Low Latency Queueing Configuring Per-VC MDRR and Low Latency Queueing with Queue Limits In the following example, per-vc MDRR and LLQ are configured with nondefault queue limits. Configure the policy map as shown in the example: Router(config)# policy-map MDRRandQlimit Router(config-pmap)# class class1 Router(config-pmap-c)# priority Router(config-pmap-c)# class class2 Router(config-pmap-c)# bandwidth remaining percent 50 Router(config-pmap-c)# queue-limit 576 cells Router(config-pmap-c)# class class-default Router(config-pmap-c)# queue-limit 576 cells After the policy map has been created, configure it on the VC using the service-policy command. Configuring Per-VC MDRR and Policed Low Latency Queueing If the police command is used with the exceed-action set to drop on the priority queue, then the bandwidth command can be used with either a percent or kbps specified. The following example uses the bandwidth percent command to guarantee bandwidth to nonpriority classes. Twenty percent of the VC rate is guaranteed to class2. Router(config)# policy-map MDRR-POLICE-LLQ Router(config-pmap)# class class1 Router(config-pmap-c)# priority Router(config-pmap-c)# police conform-action transmit exceed drop Router(config-pmap-c)# class class2 Router(config-pmap-c)# bandwidth percent 20 Router(config-pmap-c)# end Router# The next example uses the bandwidth remaining percent command, and specifies that 20 percent of the remaining bandwidth is guaranteed to class2. Router(config)# policy-map MDRR-POLICE-LLQ Router(config-pmap)# class class1 Router(config-pmap-c)# priority Router(config-pmap-c)# police conform-action transmit exceed drop Router(config-pmap-c)# class class2 Router(config-pmap-c)# bandwidth remaining percent 20 Router(config-pmap-c)# end Router# After the policy map has been created, configure it on the VC using the service-policy command. Configuring the set Commands This task illustrates how to configure the toggling of various bits, such as the ATM CLP, the IP DSCP, the IP precedence, and the MPLS experimental. Setting of the ATM CLP bit is only supported on egress queues; setting of all other bits is supported on both ingress and egress queues. 23

24 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers In this task, use one of either Step 8, Step 9, Step 10, Step 11, or Step 12, depending on what bits you need to configure. SUMMARY STEPS 1. enable 2. configure terminal 3. class-map class-map-name 4. match ip precedence numbers 5. exit 6. policy-map policy-name 7. class class-name 8. set atm-clp 9. set ip precedence value 10. set ip dscp ip-dscp-value 11. set mpls experimental value 12. set qos-group value 13. exit 14. exit 15. interface atmslot/port.subifnum 16. pvc vpi/vci 17. service-policy input policy-name DETAILED STEPS Step 1 Step 2 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Step 4 Router# configure terminal class match-any class-name Router(config-pmap)# class match-any prec345 match ip precedence numbers Router(config-cmap)# match ip precedence Specifies the user-defined name of the traffic class. The match-any keyword specifies a logical OR operator for all matching statements under this traffic class. Specifies up to eight IP precedence values used as match criteria. 24

25 Software Configuration of ATM ISE Line Cards for Cisco Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Step 5 exit Exits class-map mode. Step 6 policy-map policy-name Specifies the name of the traffic policy to configure. Step 7 Step 8 Router(config)# policy-map SET_ATM_CLP class prec345 Router(config-pmap)# class prec345 set atm-clp Specifies the name of a predefined class, which was defined with the class-map command, to be included in the traffic policy. Sets the ATM cell loss priority bit to 1. Router(config-pmap)# set atm-clp Note Use either Step 8, Step 9, Step 10, Step 11, or Step 12, depending on what bits you need to configure. Step 9 set ip precedence Specifies the IP precedence of packets within a traffic class. The IP precedence value can be any value between 0 and 7. Step 10 set ip dscp ip-dscp-value Specifies the IP DSCP of packets within a traffic class. The IP DSCP value can be any value between 0 and 63. Router(config-pmap-c)# set ip dscp 31 Step 11 set mpls experimental value Designates the value to which the MPLS bits are set if the packets match the specified policy map. Step 12 set qos-group value Specifies a QoS group value to associate with the packet. The QoS group value can be any value between 0 and 99. Router(config-pmap-c)# set qos-group 10 Step 13 exit Exits policy-map class mode. Step 14 exit Exits policy-map mode. Step 15 interface atmslot/port.subifnum Specifies the ATM subinterface to configure. Step 16 Router(config)# interface atm1/0.1 pvc vpi/vci Specifies the ATM PVC to attach the policy map to. Step 17 Router(config-subif)# pvc 10/50 service-policy input policy-name Attaches the policy map to the PVC. Router(config-if-atm-vc)# service-policy output SET_ATM_CLP 25

26 How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Software Configuration of ATM ISE Line Cards for Cisco Series Routers Examples Following are examples of configuring the IP DSCP value and the ATM CLP bit: Configuring the IP DSCP Value, page 26 Configuring the ATM CLP Bit on a Per-Queue Basis with Per-VC MDRR, page 26 Configuring the ATM CLP Bit on Class-Default Queue with Per-VC MDRR, page 26 Configuring the ATM CLP Bit by Traffic Policing, page 27 Configuring the IP DSCP Value This example marks packets of class1 by setting the IP differentiated services code point (DSCP): Router(config)# policy-map QOS-SET Router(config-pmap)# class class1 Router(config-pmap-c)# set ip dscp 63 Router(config-pmap-c)# class class2 Router(config-pmap-c)# bandwidth percent 30 Router(config-pmap-c)# exit Router(config-pmap)# In the above example, class1 is configured with a nonqueueing feature. Traffic that is matched to class1 is considered to belong to this class for purposes of the nonqueueing feature, but for purposes of queueing, the packet will go into the default queue. After the policy map has been created, configure it on the VC using the service-policy command. Configuring the ATM CLP Bit on a Per-Queue Basis with Per-VC MDRR This example configures the CLP bit setting on a per-queue basis. Precedence 0 and 1 go to the queue of class prec01 with CLP bit off; precedence 2 goes to the queue of class prec2 with the CLP on; precedence 3, 4, and 5 go to the queue of class prec345 with the CLP on; all other traffic goes to the queue of class-default with the CLP bit off. Router(config)# class-map match-any prec01 Router(config-cmap)# match ip prec 0 1 Router(config)# class-map match-any prec2 Router(config-cmap)# match ip prec 2 Router(config)# class-map match-any prec345 Router(config-cmap)# match ip prec Router(config)# policy-map SET_ATM_CLP Router(config-pmap)# class prec01 Router(config-pmap-c)# bandwidth percent 10 Router(config-pmap-c)# class prec2 Router(config-pmap-c)# bandwidth percent 10 Router(config-pmap-c)# set atm-clp Router(config-pmap-c)# class prec345 Router(config-pmap-c)# bandwidth percent 10 Router(config-pmap-c)# set atm-clp Router(config-pmap-c)# exit After the policy map has been created, configure it on the VC using the service-policy command. Configuring the ATM CLP Bit on Class-Default Queue with Per-VC MDRR This example configures the CLP bit setting on part of the traffic of the class-default queue. Precedence 0, 1 go to the queue of class prec01 with the CLP bit off; precedence 3, 4, and 5 go to the queue of class class-default with the CLP on; all other traffic goes to the queue of class-default with the CLP bit off. 26