Troubleshooting guide
B-6
Cisco PGW 2200 Softswitch Release 9.8 Operations, Maintenance, and Troubleshooting Guide
OL-0800-14
Appendix B Troubleshooting Cisco ITP-L Signaling
Troubleshooting SS7 Link Problems
Checking UDP Traffic Flows
Check User Datagram Protocol (UDP) traffic flows between the Cisco PGW 2200 Softswitch and the
Cisco ITP-L by entering the following commands:
log on 2600, enable
debug ip udp
Depending on your configuration, the response should look like the following:
2600-1#debug ip udp
UDP packet debugging is on
2600-1#
15:06:53: UDP: rcvd src=10.15.13.6(7000), dst=10.15.13.2(7000), length=32
15:06:53: UDP: rcvd src=10.15.13.6(7000), dst=10.15.13.2(7000), length=32
15:06:53: UDP: sent src=10.15.13.2(7000), dst=10.15.13.6(7000), length=164
15:06:53: UDP: sent src=10.15.13.2(7000), dst=10.15.13.6(7000), length=164
15:06:53: UDP: rcvd src=10.15.13.6(7000), dst=10.15.13.2(7000), length=12
15:06:55: UDP: sent src=10.15.13.2(7000), dst=10.15.13.6(7000), length=32
15:06:55: UDP: rcvd src=10.15.13.6(7000), dst=10.15.13.2(7000), length=12
Check for traffic in both directions. If there is traffic, see the “Checking Connection between Cisco PGW
2200 Softswitch and Cisco ITP-L” section on page B-6.
Otherwise, verify IP addresses, try to ping in both directions, reload the Cisco ITP-L software, check
subnets, and check the VLANs on the LAN switches.
Checking Connection between Cisco PGW 2200 Softswitch and Cisco ITP-L
Check that the Cisco PGW 2200 Softswitch connects to the Cisco ITP-L:
debug ss7 mtp2 backhaul ip upd
N
Where N identifies the specific MTP link. Valid values are from 0 through 3.
The Cisco ITP-L does not attempt to align the link until it receives an MTP3 Connect Indication from
the Cisco PGW 2200 Softswitch. Issue the preceding debug command to reveal the MTP3 primitives
between the Cisco ITP-L and the Cisco PGW 2200 Softswitch.
Checking the T1/E1 Link State
Check the T1 or E1 link state by observing the LEDs on the Cisco ITP-L. Ensure that the framing options
match on both sides of the physical link.
Verifying the Link Alignment Status
Check alignment status of a link by entering the following debug command:
debug ss7 mtp2 iac
N
Where N identifies the specific MTP link. Valid values are from 0 through 3.
Table B-1 describes various debug outputs from the previous command, the probable cause, and the
recommended recovery. This traffic is exchanged only when the link is initially opened. If the link is
already In-Service, nothing is displayed.