Troubleshooting Atm; Link State Error In Ipoa Application; Link Report Error In Pppoa Application; Ping Failure - 3Com MSR 50 Series Configuration Manual

Troubleshooting ATM

149
[RouterA-atm-pvc-Atm1/0-0/33-1] quit
[RouterA-Atm1/0] pvc 2 0/32
[RouterA-atm-pvc-Atm1/0-0/32-2] map ip 202.38.160.3
[RouterA-atm-pvc-Atm1/0-0/32-2] service ubr 100000
[RouterA-atm-pvc-Atm1/0-0/33-1] transmit-priority 3
After two equal traffics that exceed the ATM bandwidth are sent to Router B, you
can use the display atm pvc-info interface atm 1/0/0 pvc command on Router
B to view statistical results for each PVC (you can make several tests and observe
the average statistical value). You can see that the PVC with higher priority
receives more packets than that with lower priority. In other words, the PVC with
the highest priority takes preference in getting bandwidth and other PVCs (if there
are many and with different priority values), regardless of their priority values, are
treated equally in terms of bandwidth allocation
Troubleshooting ATM
Link State Error in IPoA Symptom:
Application
When IPoA is used, the link state is down.
Solution:
Make sure that the optical fiber is plugged in correctly.
Make sure that the local IP address has been configured.
Make sure that the PVC is successful created and communication between cards is
normal.
Link Report Error in Symptom:
PPPoA Application
When PPPoA is used, the link does not report 'UP'.
Solution:
Refer to "Link State Error in IPoA Application" on page 149.

Ping Failure

Symptom:
The physical layer of the interfaces and the line protocol are both UP, but when
tested with the ping command, the two ends are mutually unreachable.
Solution:
If IPOA is used, make sure that the IP protocol address mapping is configured
correctly. If the interfaces of two routers are connected back-to-back, the local
PVC mapped to the remote IP must have the same VPI/VCI value as the remote
PVC mapped to the local IP. In addition, the IP addresses of the two ends must also
be in the same network segment.
If two routers are connected back-to-back, make sure that at least one of
interfaces uses internal transmission clock (master). Or, if the routers are
connected to ATM network, the transmission clock should be set to line clock.