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Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Chapter 15 Diagnostic Tests
Troubleshooting Using Snoop
Troubleshooting Using Snoop
Caution
Snoop should NOT be used on the BTS 10200 call agent itself in a Production Network. It can cause
performance degradation.
Snoop can be used on the BTS 10200 call agent during test and turn-up phase during very low call
volume periods. Snoop can always be used on a separate UNIX machine connected to a switch that has
been properly setup for port span/mirroring. You must be logged in as “root” user to run snoop. Snoop
can be used to decode text protocols or can be saved to a file and opened with Ethereal when binary
protocols are used. Ethereal is open source software and can be downloaded from
http://www.ethereal.com
. To use Snoop to diagnose network problems, take the following steps:
Step 1
Find all routes to the destination in question. Most likely there will be multiple routes therefore multiple
interfaces will need to be snooped. (Skip this step if you are snooping from a separate Unix machine–you
will just snoop the span destination interface in that case.) In this example, destination Internet Protocol
(IP) 10.0.0.1 is in question. The fully qualified domain name (FQDN) can be used if it is resolvable by
domain name system (DNS). Issue the command several times as there may be redundant routes.
mssol-ca0-a# route get 10.0.0.1
route to: 10.0.0.1
destination: default
mask: default
gateway: 10.0.0.253
interface: qfe4
flags: <UP,GATEWAY,DONE>
recvpipe sendpipe ssthresh rtt,ms rttvar,ms hopcount mtu expire
0 0 0 0 0 0 1500 0
mssol-ca0-a# route get 10.0.0.1
route to: 10.0.0.1
destination: default
mask: default
gateway: 10.0.0.253
interface: qfe4
flags: <UP,GATEWAY,DONE>
recvpipe sendpipe ssthresh rtt,ms rttvar,ms hopcount mtu expire
0 0 0 0 0 0 1500 0
mssol-ca0-a# route get 10.0.0.1
route to: 10.0.0.1
destination: default
mask: default
gateway: 10.20.0.253
interface: qfe0
flags: <UP,GATEWAY,DONE>
recvpipe sendpipe ssthresh rtt,ms rttvar,ms hopcount mtu expire
0 0 0 0 0 0 1500 0
mssol-ca0-a# route get 10.0.0.1
route to: 10.0.0.1
destination: default
mask: default
gateway: 10.20.0.253
interface: qfe0
flags: <UP,GATEWAY,DONE>
recvpipe sendpipe ssthresh rtt,ms rttvar,ms hopcount mtu expire
0 0 0 0 0 0 1500 0