Cisco Systems OL-6426-02 Benutzerhandbuch

For details, see the “PortFast Configuration Error” section in the 

 document.

Use the following commands to troubleshoot your ATM interface.

Use the ping atm interface command to determine whether a particular PVC is in use. The PVC does 
not need to be configured on the router to use this command. 

 shows the use of this 

command to determine whether PVC 8/35 is in use.

Router# ping atm interface atm 0 8 35 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 = 148/148/148 ms

!----This command sends five OAM F5 loopback packets to the DSLAM (segment OAM packets). 

If the PVC is configured at the DSLAM, the ping is successful.

!----To test whether the PVC is being used at the aggregator, enter the following command:

Router# ping atm interface atm 0 8 35 end-loopback 

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 = 400/401/404 ms

!----This command sends end-to-end OAM F5 packets, which are echoed back by the 

aggregator.

Use the show interface command to display the status of all physical ports (Ethernet and ATM) and 
logical interfaces on the router. 

 shows sample command output.

Router# show interface atm 0

ATM0 is up, line protocol is up