Troubleshooting guide

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Cisco PGW 2200 Softswitch Release 9.8 Operations, Maintenance, and Troubleshooting Guide
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Chapter 6 Troubleshooting the Cisco PGW 2200 Softswitch Platform
Resolving Bearer Channel Connection Problems
Media Gateway IP Destination or Link Out-of-Service
If an IP link or destination to a media gateway is out-of-service, perform the following steps:
Note An IP destination to a media gateway is out-of-service when both IP links associated with the destination
are out-of-service.
Step 1 If you have not already collected system data, refer to the method that is described in the “Collecting
System Data for Cisco TAC” section on page 6-93.
Step 2 Ping the affected Cisco PGW 2200 Softswitch link from the associated media gateway by using
the
ping link_addr UNIX command.
Where:
link_addr—IP address of the affected Cisco PGW 2200 Softswitch link.
Repeat this step if the second link for the destination is also out-of-service.
If the links are unreachable, proceed to Step 10. Otherwise, proceed to Step 3.
Step 3 If the path between the Cisco PGW 2200 Softswitch and the media gateway is defined using an MGCP
signaling service, proceed to Step 4. If the path between the Cisco PGW 2200 Softswitch and the media
gateway is defined using a NAS signaling service, proceed to Step 5.
Step 4 Verify that the MGCP interface on your media gateway is working properly. See the documentation that
is associated with the media gateway for more information.
If the MGCP interface on your media gateway is working properly, proceed to Step 10. Otherwise,
correct the problems with the MGCP interface as described in the documentation that is associated with
the media gateway.
Step 5 Identify which Redundant Link Manager (RLM) group is configured on the media gateway by entering
the sh run command. For more information on this command, see the documentation that is associated
with the media gateway.
Step 6 Verify that the RLM group identified in Step 5 is defined under the D-channel serial interface. See the
documentation that is associated with the media gateway for more information.
If the RLM group is defined, proceed to Step 7. Otherwise, add the RLM group to the D-channel serial
interface. See the documentation that is associated with the media gateway for more information.
If the link returns to service, the procedure is complete. Otherwise, proceed to Step 7.
Step 7 Reset the RLM group using the shut/no shut commands. See the documentation that is associated with
the media gateway for more information.
If the links return to service, the procedure is complete. Otherwise, proceed to Step 8.
Step 8 Verify that the Cisco PGW 2200 Softswitch acknowledges RLM messages by issuing the debug
command. See the documentation that is associated with the media gateway for more information.
If the Cisco PGW 2200 Softswitch acknowledges RLM messages, proceed to Step 10. Otherwise,
proceed to Step 9.