Cisco ISE - Line Card ISE Manuale utente

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Software Configuration of ATM ISE Line Cards for

Cisco 12000 Series Routers

This feature module describes the software configuration for the Cisco 4-Port ATM Internet Services

Engine (ISE) line cards in the Cisco 12000 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

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 http://www.cisco.com/go/fn. 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

Release Modification

12.0(25)S The 4-Port OC-12c/STM-4c ATM ISE line card was introduced.

12.0(26)S2 The 4-Port OC-3c/STM-1 ATM ISE line card was integrated into 12.0(26)S.

12.0(27)S1 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.

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

Prerequisites for the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

•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 Limitation

Maximum number of cell packing or policing VCs1

1. VC=virtual circuit.

508 per port2

2. Hardware limitation.

Maximum number of active VCs3:

Layer 2

Layer 3

3. Subject to overall system limitation and configuration.

10244per port and card

20473per port and card

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.

Range of VPI5values

5. VPI=virtual path identifier.

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

Range of VCI6values

6. VCI=virtual channel identifier.

Varies with vc-per-vp value, up to 65,535

Table 2 Scalability Limitations for the 4-Port ATM ISE Line Card

Feature

Layer 2

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 features1508

Maximum number of AToM Tunnels per port with cell packing 508

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

Information About the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

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 12000 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 12000 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 0..255; network-to-network

interface (NNI) VPIs can be in the range of 0..4095. 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.

Maximum number of AToM Tunnels per line card with features11024

Maximum number of AToM Tunnels per line card with cell packing 1024

1. Includes features such as policing

Table 2 Scalability Limitations for the 4-Port ATM ISE Line Card (continued)

Feature

Layer 2

Limitation

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

Information About the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

•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

•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).

Layer 2-Specific Features

•Supports up to 2047 traffic-shaped VC connections per interface.2

1. Subject to overall system limitation and configuration.

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

•Any Transport over Multiprotocol Label Switching (MPLS) [AToM].

•AT M OA M E m u l a t i o n

•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.

2. Subject to overall system limitation and configuration.

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

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

Configuration Basics

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 12000 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.)

SUMMARY STEPS

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

DETAILED STEPS

Command or Action Purpose

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 enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 4 configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 5 interface atmslot/port

Example:

Router(config)# interface atm1/3

Enter interface configuration mode for the specified ATM

interface.

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

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 0..255 (UNI) to 0..4095 (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:

To display information about the current state of the ATM network, use the following commands:

Step 6 no shutdown

Example:

Router(config-if)# no shutdown

Change the state of the interface to up and enable the

interface.

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.

Command or Action Purpose

Command Purpose

Router# show version 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.

Router# show gsr Displays information about the hardware modules installed in the

Cisco 12000 Series Router.

Router# show interfaces atm slot/port Displays information about the ATM interfaces. For example, to display

information about slot 2, port 0, enter:

Router# show interfaces atm2/0

Router# show running-config Displays information about the currently running configuration in RAM.

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

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

Command Purpose

Router# show atm interface atm slot/port Displays current ATM-specification information about the 4-Port ATM ISE

line card interface.

Router# show atm traffic Displays current ATM statistics.

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

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:

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.

Command Purpose

Router# show atm pvc Displays current ATM PVC information.

Router# show atm vc Displays current ATM VC information.

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

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers

How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card

Cisco IOS Release 12.0(27)S

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

Command or Action Purpose

Step 1 enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 interface atmslot/port.subinterface

Example:

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.

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