Troubleshooting guide

5-11
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-02
Chapter 5 Troubleshooting Switch Router ATM Interface Connections
Performing OAM Loopback Tests
Test 1—Segment Network-Side Loopback Process
Follow these steps to ping the ATM virtual channel 2, 130 between the administration and manufacturing
buildings, with a segment loopback signal in normal mode:
Step 1 Use the ping atm interface atm card/subcard/port command to confirm the VP connectivity.
AdminFl1Ls1# ping atm interface atm 1/0/0 2 seg-loopback
Type escape sequence to abort.
Sending Seg-Loopback 5, 53-byte OAM Echoes to a neighbor, timeout is 5 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
AdminFl1Ls1#
Step 2 Use the same command to ping the ATM virtual channel 2, 130 between the administration and
manufacturing buildings with a segment loopback signal in normal mode:
AdminFl1Ls1# ping atm interface atm 1/0/0 2 130 seg-loopback
Type escape sequence to abort.
Sending Seg-Loopback 5, 53-byte OAM Echoes to a neighbor, timeout is 5 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
AdminFl1Ls1#
Step 3 Check the Success rate field. If the success rate is less that 100 percent, you have a problem on the
622-Mbps connection between the administration and manufacturing buildings.
Step 4 Check the cables and the interface configuration, using the procedures in the “Performing Basic
Interface Checks” section on page 5-1.
If the success rate is 100 percent, then this segment of the connection is not the problem. Proceed with
the next phase of the interface loopback test.
Test 2—Segment Link-Side Loopback Process
Log in to the ATM switch router in the manufacturing building and use the ping atm interface atm
command again to confirm the ATM connection between the ATM switch router and the Catalyst 5000
switches in the manufacturing building.
Use the following steps to ping the ATM virtual path 2 between the ATM switch router and the
Catalyst 5000 switches in the manufacturing building, with a segment loopback signal in normal mode:
Step 1 Use the ping atm interface atm card/subcard/port command to confirm the VP connectivity.
ManuFl1Ls1# ping atm interface atm 4/0/0 2 seg-loopback
Type escape sequence to abort.
Sending Seg -Loopback 5, 53-byte OAM Echoes to a neighbor, timeout is 5 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
ManuFl1Ls1#