Cisco Cisco ASR 5700 Guía Para Resolver Problemas

Capture wireshark trace on the Gb interface (Router connected to SGSN). If the Gb link is
created on load shared basis, capture the trace on both the routers at the same time.

1.

Select packet with UDP Protocol in the trace, right click and decode it as GPRS-NS,
selecting Both option first.

2.

Apply the filter with NSEI ID., for example nsip.nsei==xxxx, to check the PDU between BSC
and SGSN.

3.

(Engineering mode)

Determine the element causing the problem and take the corrective action accordingly.