Troubleshooting guide

5-5

ATM and Layer 3 Switch Router Troubleshooting Guide

OL-1969-02

Chapter 5 Troubleshooting Switch Router ATM Interface Connections

Determining Network Connectivity

To check ATM connection reachability and network connectivity, use the ping atm interface atm

command in either privileged or user mode. You can use either an IP address or an ATM address prefix

as a ping destination. You can also ping a neighbor switch router by selecting the segment loopback

option. In privilege extended command mode, you can select other parameters such as repeat count and

timeout values.

Follow these steps to ping a specific ATM prefix in both normal and extended mode:

Step 1 Use the ping atm interface atm command, in normal mode, to confirm connectivity through a specific

interface to an ATM address prefix.

Switch# ping atm interface atm 1/0/0 0 5 atm-prefix 47.009181000000000000000001

Type escape sequence to abort.

Sending 5, 53-byte OAM Echoes to 47.0091.8100.0000.0000.0000.0001..., timeout is

5 seconds:

!!!!!

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

Step 2 Check the Success rate field. It should be 100 percent. If not, check the interface configuration.

Step 3 Use the ping atm interface atm command, in extended mode, to confirm connectivity through a specific

interface to an ATM address prefix and modify the default repeat or timeout.

Switch# ping

Protocol [ip]: atm

Interface [card/subcard/port]: 1/0/0

VPI [0]: 0

VCI [0]: 5

Send OAM-Segment-Loopback ? [no]:

Target IP address:

Target NSAP Prefix: 47.009181000000000000000001

Repeat count [5]:

Timeout in seconds [5]:10

Type escape sequence to abort.

Sending 5, 53-byte OAM Echoes to 47.0091.8100.0000.0000.0000.0001..., timeout is

10 seconds:

!!!!!

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

Step 4 Check the Success rate field. It should be 100 percent. If not, check the interface configuration.

Note If you skip both destination IP address and the ATM prefix fields, the extended ping

considers its neighbor switch as its destination and uses a segment-Loopback operation,

administration, and maintenance (OAM) cell. In an IP address or ATM prefix case, the ping

command always uses an end-to-end OAM loopback cell.

Command Purpose

ping atm interface atm card/subcard/port vpi vci

{atm-prefix prefix | end-loopback |

ip-address ip-address | seg-loopback}

Checks the interface connection.