ATM OAM Ping

Last Updated: May 4, 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

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 XE 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

•Feature Information for ATM OAM Ping

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.

Restrictions for the ATM OAM Ping Feature

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

•Network service access point (NSAP) addresses

•Multiple-hop loopbacks

•Loopback location identification

Information About the ATM OAM Ping Feature

•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

•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)

Perform this task 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]]]]

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]]]]

Example:

ping atm interface atm 1/1/0.100 0 500

end-loopback 1 2


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

•atm interface-number—ATM interface name.

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

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

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

•seg-loopback—Sends ATM segment loopback cells.

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

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

Testing Network Connectivity Using ATM Interface Ping (Interactive Mode)

Perform this task 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

•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 10/100 


ATM1/1/0.100: VCD: 3, VPI: 10, VCI: 100 

UBR, PeakRate: 100000 (235850 cps) 

AAL5-LLC/SNAP, etype:0x0, Flags: 0x40, VCmode: 0x0, Encapsize: 12 

OAM frequency: 0 second(s), OAM retry frequency: 1 second(s) 

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

OAM Loopback status: OAM Disabled 

Last cell looped No 

Loop detect state 0, Last cell looped 0, OAM Retries 0, Loop Retries 0 

OAM VC Status: Not Managed 

ILMI VC status: Not Managed 

InARP frequency: 15 minutes(s) 

Transmit priority 3 

InPkts: 78310, OutPkts: 78310, InBytes: 218651435, OutBytes: 218651435 

InPRoc: 0, OutPRoc: 16, Broadcasts: 15 

InFast: 0, OutFast: 0, InAS: 78310, OutAS: 78281 

InPktDrops: 0, OutPktDrops: 0 

CrcErrors: 0, SarTimeOuts: 0, OverSizedSDUs: 0, LengthViolation: 0, CPIErrors: 0 

Out CLP=1 Pkts: 0 

OAM cells received: 315 

F5 InEndloop: 310, F5 InSegloop: 5, F5 InAIS: 0, F5 InRDI: 0 

OAM cells sent: 315 

F5 OutEndloop: 310, F5 OutSegloop: 5, F5 OutAIS: 0, F5 OutRDI: 0 

OAM cell drops: 0 

Status: UP 


VC 10/100 doesn't exist on 2 of 3 ATM interface(s) 

Router#

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 atm1/1/0.1 500


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 atm1/1/0.1 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 atm1/1/0.1 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 atm1/1/0.1 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 10/100 


ATM1/1/0.100: VCD: 3, VPI: 10, VCI: 100 

UBR, PeakRate: 100000 (235850 cps) 

AAL5-LLC/SNAP, etype:0x0, Flags: 0x40, VCmode: 0x0, Encapsize: 12 

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

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

OAM Loopback status: OAM Received 

Last cell looped No 

Loop detect state 0, Last cell looped 0, OAM Retries 0, Loop Retries 0 

OAM VC Status: Verified 

ILMI VC status: Not Managed 

VC is managed by OAM. 

InARP frequency: 15 minutes(s) 

Transmit priority 3 

InPkts: 78310, OutPkts: 78310, InBytes: 218651435, OutBytes: 218651435 

InPRoc: 0, OutPRoc: 16, Broadcasts: 15 

InFast: 0, OutFast: 0, InAS: 78310, OutAS: 78281 

InPktDrops: 0, OutPktDrops: 0 

CrcErrors: 0, SarTimeOuts: 0, OverSizedSDUs: 0, LengthViolation: 0, CPIErrors: 0 

Out CLP=1 Pkts: 0 

OAM cells received: 331 

F5 InEndloop: 326, F5 InSegloop: 5, F5 InAIS: 0, F5 InRDI: 0 

OAM cells sent: 331 

F5 OutEndloop: 326, F5 OutSegloop: 5, F5 OutAIS: 0, F5 OutRDI: 0 

OAM cell drops: 0 

Status: UP 


VC 10/100 doesn't exist on 2 of 3 ATM interface(s) 

Router#

Interactive ping Command: Example

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

router# ping 


Protocol [ip]: atm 

ATM Interface: atm1/1/0.100 

VPI value [0]: 10 

VCI value [1]: 100 

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 = 1/1/1 ms 

Router#

Additional References

Related Documents

Related Topic
Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

ATM commands

Cisco IOS Asynchronous Transfer Mode Command Reference

ATM Overview

Overview of the ATM SPAs

Configuring ATM OAM traffic reduction

ATM OAM Traffic Reduction

Detecting failures when using OAM cells and PVC management

Troubleshooting PVC Failures When Using OAM Cells and PVC Management


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 XE software 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


Feature Information for ATM OAM Ping

Table 1 lists the release history for this feature.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS XE 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 XE software release that introduced support for a given feature in a given Cisco IOS XE software release train. Unless noted otherwise, subsequent releases of that Cisco IOS XE software release train also support that feature.

Table 1 Feature Information for ATM OAM Ping

Feature Name
Releases
Feature Information

ATM OAM Ping

Cisco IOS XE Release 2.3

The ATM OAM Ping feature sends an ATM OAM packet to confirm the connectivity of a specific 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.

The following command was introduced or modified: ping atm interface atm.


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