Troubleshooting guide

B-7
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
Verifying Exchanged Point Codes
Check exchanged point codes by entering the following command:
debug ss7 mtp2 pac N
Where N identifies the specific MTP link. Valid values are 0 through 3.
Table B-2 describes various debug outputs from this command, the probable cause, and the
recommended recovery when the Cisco PGW 2200 Softswitch is using ANSI SS7. Table B-3 describes
the debug outputs when the Cisco PGW 2200 Softswitch is using ITU SS7.
Table B-1 Debug Outputs, Probable Causes, and Recovery Actions
Debug Output Probable Cause Recovery Action
No output. Link is already aligned.
MTP2 is not started.
1. Check that term monitor is
on.
2. Reload Cisco ITP-L.
3. Cross-check configuration
files.
15:12:33: itu2IAC_Start chnl=0 MTP2IAC_IDLE
15:12:34: itu2IAC_Stop chnl=0 MTP2IAC_NOT_ALIGNED
15:12:39: itu2IAC_Start chnl=0 MTP2IAC_IDLE
15:12:51: itu2IAC_T2_TMO chnl=0 MTP2IAC_NOT_ALIGNED
15:12:56: itu2IAC_Start chnl=0 MTP2IAC_IDLE
15:13:07: itu2IAC_T2_TMO chnl=0 MTP2IAC_NOT_ALIGNED
15:13:12: itu2IAC_Start chnl=0 MTP2IAC_IDLE
MTP2 does not flow across
the link.
Check DS0 assignment
(should use the same time
slot on both sides of the
physical link) and the DS0
speed (defaults to 56 kb/s on
T1 and 64 kb/s on E1). The
following items can change
the DS0 speed:
conf t
contr E1 0/0
channel-group 0
timeslot 1 speed 56
15:14:32: itu2IAC_Start chnl=0 MTP2IAC_IDLE
15:14:33: itu2IAC_Rcvd_SIE chnl=0 MTP2IAC_NOT_ALIGNED
15:14:33: itu2IAC_Rcvd_SIE chnl=0 MTP2IAC_ALIGNED
15:14:37: itu2IAC_T4_TMO chnl=0 MTP2IAC_PROVING
15:14:38: %LINEPROTO-5-UPDOWN: Line protocol on
Interface Serial0/0:0, changed state to up
15:14:45: itu2IAC_Rcvd_SIOS chnl=0 MTP2IAC_IDLE
15:14:46: %LINEPROTO-5-UPDOWN: Line protocol on
Interface Serial0/0:0, changed state to down
15:14:50: itu2IAC_Start chnl=0 MTP2IAC_IDLE
15:14:50: itu2IAC_Rcvd_SIE chnl=0 MTP2IAC_NOT_ALIGNED
15:14:50: itu2IAC_Rcvd_SIE chnl=0 MTP2IAC_ALIGNED
15:14:54: itu2IAC_T4_TMO chnl=0 MTP2IAC_PROVING
15:14:55: %LINEPROTO-5-UPDOWN: Line protocol on
Interface Serial0/0:0, changed state to up
The link is able to align, but
fails in the PROVING
sequence.
It is generally a mismatch in
point codes.
Check the provisioning
settings for the SLC, OPC,
and DPC in the Cisco PGW
2200 Softswitch, as
described in the “Bouncing
SS7 Links” section on
page 6-101.
Use an SS7 sniffer tool to
look at the exchanged point
codes. The procedure in
“Verifying Exchanged Point
Codes” section on page B-7
describes how to use the
Cisco ITP-L debug tools to
see the point codes.