Troubleshooting guide

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Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
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Chapter 9 Troubleshooting Cisco Media Gateways
Troubleshooting the Gateways
Displaying Log File Information
Log files record switch events such as operator login and command entry. To view the contents of the
current log, enter the following command:
pop20two.7.PXM.a > dsplog [-sl <slot>] [-mod CLI]
To limit the log display to the events for a single slot, use the -sl option and replace slot with the
appropriate slot number.
To limit the log display to CLI events, use the -mod option with the CLI keyword.
To display a list of archived log files, enter the following command:
pop20two.7.PXM.a > dsplogs
The log files are stored in the C:/LOG directory.
Troubleshooting the Gateways
This section describes procedures for troubleshooting the Cisco Media Gateways. It also lists the actions
you can take if you encounter situations not listed in this section.
D-Channel
D-channels are 1xDS0 64K HDLC channels which carry the ISDN PRI Q.931 signalling messages over
the PRI. The LAPD Q.921 protocol on top of HDLC channel ensures reliable and sequential delivery of
these messages over the HDLC channel. These D-channels should be configured on the MGX8260 as
well as the soft-switch (call-agent).
There are about 15 to 20 parameters associated with Q.921 which are user-configurable. These
parameters are divided into two parts — the DLSAP parameters and MACSAP parameters. Most of these
parameters are used as defaults and only a few parameters are modified. Therefore, you do not need to
specify each one of these parameters every time a D-channel needs to be added. You can configure
DLSAP and MACSAP templates and specify these templates while adding D-channels.
DLSAP template/profile
This configuration is persistent and is associated with an SCC (this means the DLSAP profiles are not
cleared when any service-card configuration is cleared). The DLSAP profiles are cleared only with either
“clrndcnf” “clrcdcnf” on SCC slot. These profiles are restored on the SCC on “resetnd”.
The adddlsp command adds a DLSAP profile. This command could fail for the following reasons:
1. If the DLSAP profile is already added.
2. If the DLSAP index is out of range.
3. If one of the parameters being configured is out of range/illegal.
The lsdlsp command displays a DLSAP profile. This command could fail for the following reasons:
1. If the DLSAP index specified in the command is NOT added.
2. If the DLSAP index is out of range.