Hello all, I hope I can get some assistant please.
I am supporting a customer with a 2900 router version 15.6(2) running CME 11.0.
For the past 4 weeks now we have had intermittent call drop outs and inability to make or receive external calls. The external connect is ISDN and we have 3 BRI WICs installed.
The symptoms I have seen trying to debug the issue are when running show isdn memory:
NGS-AUS-PABX#sh isdn mem
MEMORY POOL STATISTICS
BlockType in use max used limit initial increment
mail descriptors 0 13 11904 1488 31
exec timer blocks 0 0 11904 1 31
Modem_msg 0 0 100 100 48
LIF timers 56826 89277 90210 930 930
L2IF timers 6 10 384 96 96
PRIM_BTYPE 56832 89280 89280 930 930
PKT_BTYPE 10 16 6014 62 31
HEADER_BTYPE 0 1 5952 31 31
SML_INFO_BTYPE 0 2 5952 310 31
LRG_INFO_BTYPE 10 16 6014 310 31
PKG_BTYPE 0 2 5952 310 31
Tdial_msg 0 0 2976 1 96
Router_msg 0 0 2976 30 48
X25_msg 0 0 2976 1 96
Socket_msg 0 0 2976 1 96
Call Tables 0 0 5952 31 31
Called Num Blks 0 1 5952 31 31
SCBs 0 0 2976 31 31
CCBs 0 5 5952 960 96
DLCBs 2 3 288 96 96
NLCBs 2586 4061 5952 31 31
The LIF timers and PRIM_BTYPE numbers continue to increase with the error handle_l2d_srq_mail: Layer 1 inactive being recorded while q921 is on. When the PRIM_BTYPE reaches the limit to symptoms of the problem occur.
I have also noticed that if I run show isdn status the questionable ISDN interface fluctuates between:
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
and:
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = AWAITING_ESTABLISHMENT
I have contacted the Telco and they advise the issue is not their infrastructure.
Hope someone can help please.
Really struggling to resolve this if someone can please assist.
