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ATM OAM Ping
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Table Of Contents

ATM OAM Ping

Finding Feature Information

Contents

Prerequisites for the ATM OAM Ping Feature

Restrictions for the ATM OAM Ping Feature

Information About the ATM OAM Ping Feature

Benefits of the ATM OAM Ping Feature

How to Use the ATM OAM Ping Feature

Testing Network Connectivity Using ATM Interface Ping (Normal Mode)

Testing Network Connectivity Using ATM Interface Ping (Interactive Mode)

Aborting a Ping Session

Configuration Examples for ATM OAM Ping

Verifying the Connectivity of a Specific PVC: Example

Normal Mode ping atm interface atm Command: Example

Interactive ping Command: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

Feature Information for ATM OAM Ping


ATM OAM Ping

First Published: 12.0(21)S
Last Updated: February 27, 2009

The ATM OAM Ping feature sends an ATM Operation, Administration, and Maintenance (OAM) packet to confirm the connectivity of a specific permanent virtual circuit (PVC). The status of the PVC is displayed when a response to the OAM packet is received. The ATM OAM Ping feature allows the network administrator to verify PVC integrity and facilitates ATM network troubleshooting.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for ATM OAM Ping" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for the ATM OAM Ping Feature

•Restrictions for the ATM OAM Ping Feature

•Information About the ATM OAM Ping Feature

•How to Use the ATM OAM Ping Feature

•Configuration Examples for ATM OAM Ping

•Additional References

•Command Reference

Prerequisites for the ATM OAM Ping Feature

A PVC corresponding to the virtual path identifier (VPI) and virtual channel identifier (VCI) values entered with the ping command should already exist. (For Cisco 827 series routers, the virtual circuit need not exist.)

For information about how to configure ATM PVCs, see the section "Configuring PVCs" in the chapter "Configuring ATM" in the Cisco IOS Wide-Area Networking Configuration Guide.

Restrictions for the ATM OAM Ping Feature

The ATM OAM Ping feature does not support pings based on the following:

•Network service access point (NSAP) addresses

•Multiple-hop loopbacks

•Loopback location identification

Information About the ATM OAM Ping Feature

To use the ATM OAM Ping feature, you must understand the following concepts:

•Benefits of the ATM OAM Ping Feature

•How to Use the ATM OAM Ping Feature

Benefits of the ATM OAM Ping Feature

The ATM OAM Ping feature modifies the ping command, which can be used to send an OAM packet to verify PVC connectivity. The status of the PVC is displayed when a response to the OAM packet is received. This is a common method for testing the accessibility of devices.

The ping atm interface atm command provides two ATM OAM ping options:

•End loopback—Verifies end-to-end PVC integrity.

•Segment loopback—Verifies PVC integrity to the immediate neighboring ATM device.

The ping atm interface atm command is used to determine the following:

•Whether a remote host is active or inactive.

•The round-trip delay in communicating with the host.

•Packet loss.

The simpler ping command provides an interactive mode for testing ATM network connectivity. The ping command first sends an OAM command loopback cell to the destination and then waits for an OAM response loopback cell. The ping is successful only when the following criteria are met:

•The OAM command loopback cell reaches the destination.

•The destination is able to send an OAM loopback response cell back to the source within a predetermined time called a timeout. The default value of the timeout is 2 seconds on Cisco routers.

How to Use the ATM OAM Ping Feature

The following sections describes tasks that use ping commands to test network connectivity in an ATM network. The tasks in this list are optional.

•Testing Network Connectivity Using ATM Interface Ping (Normal Mode)

•Testing Network Connectivity Using ATM Interface Ping (Interactive Mode)

•Aborting a Ping Session

Testing Network Connectivity Using ATM Interface Ping (Normal Mode)

This section describes how to test the network connectivity by using the ping atm interface atm command in normal mode; that is, by entering all values for the ping test on the command line.

SUMMARY STEPS

1. enable

2. ping atm interface atm interface-number vpi-value [vci-value [end-loopback [repeat [timeout]] | seg-loopback [repeat [timeout]]]]

or

ping atm interface atm interface-number vpi-value vci-value [end-loopback [ignore-loop] | seg-loopback] [repeat] [timeout]

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

ping atm interface atm interface-number vpi-value [vci-value [end-loopback [repeat [timeout]]| seg-loopback [repeat [timeout]]]]


or

ping atm interface atm interface-number vpi-value vci-value [end-loopback [ignore-loop] | seg-loopback] [repeat] [timeout]

Example:

Router# ping atm interface atm 1/1.1 0 500 end-loopback 1 2


Displays a response to confirm the connectivity of a specific PVC for ASR 1000 series.

or

Displays a response to confirm the connectivity of a specific PVC for Cisco 7200 and 7500 series, Catalyst 6500 and 7600 Series.

•atm interface-number—ATM interface name.

•vpi-value—Virtual path identifier. Range: 0 to 255.

•vci-value—Virtual channel identifier. Range: 0 to 65535.

•(Optional) end-loopback—Sends ATM end loopback cells. This is the default.

•(Optional) seg-loopback—Sends ATM segment loopback cells.

•(Optional) repeat—Number of ping packets that are sent to the destination. Range: 1 to 1000. Default: 5.

•(Optional) timeout—Timeout interval, in seconds. Range: 1 to 30. Default: 2.

•(Optional) ignore-loop—Displays a successful response when the peer ATM interface is in a loopback mode.

Testing Network Connectivity Using ATM Interface Ping (Interactive Mode)

This section describes how to test network connectivity by using the ping command; that is, by providing values for the ping test by typing the value after the prompts displayed and pressing the Enter key. Press the Enter key without supplying a value to use the default.

SUMMARY STEPS

1. enable

2. ping

DETAILED STEP

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

ping

Example:

Router# ping

Displays a response to confirm the connectivity of a specific PVC.

Aborting a Ping Session

To terminate a ping session, type the escape sequence—by default, Ctrl-Shift-6.

Configuration Examples for ATM OAM Ping

This section provides the following configuration examples:

•Verifying the Connectivity of a Specific PVC: Example

•Normal Mode ping atm interface atm Command: Example

•Interactive ping Command: Example

Verifying the Connectivity of a Specific PVC: Example

The following example verifies the connectivity of a specific PVC by sending an ATM OAM packet and confirms the connectivity when it is successful: 

Router# show atm pvc 0/500


VC 0/500 doesn't exist on interface ATM1/0 - cannot display

ATM1/1.1: VCD: 2, VPI: 0, VCI: 500

UBR, PeakRate: N/A (UBR VC)

AAL5-LLC/SNAP, etype:0x0, Flags: 0xC20, VCmode: 0x0

OAM frequency: 10 second(s), OAM retry frequency: 1 second(s)

OAM up retry count: 3, OAM down retry count: 5

OAM END CC Activate retry count: 3, OAM END CC Deactivate retry count: 3

OAM END CC retry frequency: 30 second(s),

OAM SEGMENT CC Activate retry count: 3, OAM SEGMENT CC Deactivate retry count: 3

OAM SEGMENT CC retry frequency: 30 second(s),

OAM Loopback status: OAM Received

OAM VC state: Verified

ILMI VC state: Not Managed

OAM END CC status: OAM CC Ready

OAM END CC VC state: Verified

OAM SEGMENT CC status: OAM CC Ready

OAM SEGMENT CC VC state: Verified

VC is managed by OAM.

InARP frequency: 15 minutes(s)

InPkts: 289035, OutPkts: 217088, InBytes: 21165546, OutBytes: 17367793

InPRoc: 289039, OutPRoc: 289274

InFast: 0, OutFast: 0, InAS: 1, OutAS: 2

Out CLP=1 Pkts: 0

OAM cells received: 119900

F5 InEndloop: 119809, F5 InSegloop: 0,

F5 InEndcc: 0, F5 InSegcc: 0, F5 InAIS: 92, F5 InRDI: 0

OAM cells sent: 119902

F5 OutEndloop: 119810, F5 OutSegloop: 0,

F5 OutEndcc: 0, F5 OutSegcc: 0, F5 OutAIS: 0, F5 OutRDI: 92

OAM cell drops: 0

Status: UP

Normal Mode ping atm interface atm Command: Example

The following example shows sample output for the ping atm interface atm command in normal mode: 

Router# ping atm interface atm1/1.1 0 500


Type escape sequence to abort.

Sending 5, 53-byte end-to-end OAM echoes, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/16/52 ms


Router# ping atm interface atm1/1.1 0 500 seg-loopback


Type escape sequence to abort.

Sending 5, 53-byte segment OAM echoes, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms


Router# ping atm interface atm1/1.1 0 500 end-loopback 100 25


Type escape sequence to abort.

Sending 100, 53-byte end-to-end OAM echoes, timeout is 25 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (100/100), round-trip min/avg/max = 4/13/180 ms


Router# ping atm interface atm1/1.1 0 500 seg-loopback 50 20


Type escape sequence to abort.

Sending 50, 53-byte segment OAM echoes, timeout is 20 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (50/50), round-trip min/avg/max = 1/1/4 ms


Router# show atm pvc 0/500


VC 0/500 doesn't exist on interface ATM1/0 - cannot display

ATM1/1.1: VCD: 2, VPI: 0, VCI: 500

UBR, PeakRate: N/A (UBR VC)

AAL5-LLC/SNAP, etype:0x0, Flags: 0xC20, VCmode: 0x0

OAM frequency: 10 second(s), OAM retry frequency: 1 second(s)

OAM up retry count: 3, OAM down retry count: 5

OAM END CC Activate retry count: 3, OAM END CC Deactivate retry count: 3

OAM END CC retry frequency: 30 second(s),

OAM SEGMENT CC Activate retry count: 3, OAM SEGMENT CC Deactivate retry count: 3

OAM SEGMENT CC retry frequency: 30 second(s),

OAM Loopback status: OAM Received

OAM VC state: Verified

ILMI VC state: Not Managed

OAM END CC status: OAM CC Ready

OAM END CC VC state: Verified

OAM SEGMENT CC status: OAM CC Ready

OAM SEGMENT CC VC state: Verified

VC is managed by OAM.

InARP frequency: 15 minutes(s)

InPkts: 290975, OutPkts: 219031, InBytes: 21306632, OutBytes: 17509085

InPRoc: 290979, OutPRoc: 291219

InFast: 0, OutFast: 0, InAS: 1, OutAS: 2

Out CLP=1 Pkts: 0

OAM cells received: 120881

F5 InEndloop: 120734, F5 InSegloop: 55,

F5 InEndcc: 0, F5 InSegcc: 0, F5 InAIS: 92, F5 InRDI: 0

OAM cells sent: 120882

F5 OutEndloop: 120735, F5 OutSegloop: 55,

F5 OutEndcc: 0, F5 OutSegcc: 0, F5 OutAIS: 0, F5 OutRDI: 92

OAM cell drops: 0

Status: UP

Interactive ping Command: Example

The following is sample output for the ping command in the interactive mode: 

Router# ping


Protocol [ip]: atm


ATM Interface: atm1/1.1


VPI value [0]: 0


VCI value [1]: 500


Loopback - End(0), Segment(1) [0]:

Repeat Count [5]:

Timeout [2]:

Type escape sequence to abort.

Sending 5, 53-byte end-to-end OAM echoes, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/9/12 ms

Additional References

The following sections provide references related to the ATM OAM Ping feature.

Related Documents

Related Topic
Document Title

Configuring PVCs and mapping a protocol address to a PVC while configuring ATM

Configuring PVCs section of Cisco IOS Configuring ATM Feature Guide

Configuring ATM

Cisco IOS Configuring ATM Feature Guide

WAN commands, complete command syntax, command mode, command history, defaults, usage guidelines, and examples

Cisco IOS Asynchronous Transfer Mode Command Reference

Configuring ATM OAM traffic reduction

ATM OAM Traffic Reduction feature module

Configuring PVCs with or without OAM

Using OAM for PVC Management sample configuration

Detecting failures when using OAM cells and PVC management

Troubleshooting PVC Failures When Using OAM Cells and PVC Management technical note


Standards

Standard
Title

ITU-T Specification I.610 (ITU-T specification for B-ISDN operation and maintenance principles and functions).

I.610 Series I: Integrated Services Digital Network Maintenance principles


MIBs

MIB
MIBs Link

•None

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

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


RFCs

RFC
Title

None

—


Technical Assistance

Description
Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport


Command Reference

The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco IOS Asynchronous Transfer Mode Command Reference at http://www.cisco.com/en/US/docs/ios/atm/command/reference/atm_book.html. For information about all Cisco IOS commands, use the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or the Cisco IOS Master Command List, All Releases, at http://www.cisco.com/en/US/docs/ios/mcl/allreleasemcl/all_book.html.

•ping atm interface atm

Feature Information for ATM OAM Ping

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

Table 1 Feature Information for ATM OAM Ping

Feature Name
Releases
Feature Information

ATM OAM Ping

12.0(21)S

12.2(13)T

12.2(25)S

12.2(18)SXE

12.2(28)SB

The ATM OAM Loopback Mode Detection feature lets the router automatically detect when a peer ATM interface is in loopback mode. When loopback is detected on an interface where end-to-end F5 Operation, Administration, and Maintenance (OAM) is enabled, the impacted permanent virtual circuit (PVC) is moved to a DOWN state, and traffic is suspended. When the loopback condition in the peer ATM interface is removed, the PVC is moved back to an UP state.


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