"show isdn status" output and number of bearer channels available

[hsgoraya77]

The following is an output from show isdn status:-

Router#sh isdn status
Global ISDN Switchtype = primary-ni
ISDN Serial1/0:23 interface
        dsl 0, interface ISDN Switchtype = primary-ni
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
    Layer 3 Status:
        3 Active Layer 3 Call(s)
        CCB:callid=86E3, sapi=0, ces=0, B-chan=23, calltype=VOICE
        CCB:callid=90BD, sapi=0, ces=0, B-chan=22, calltype=VOICE
        CCB:callid=90C1, sapi=0, ces=0, B-chan=20, calltype=VOICE
        CCB:callid=311D, sapi=0, ces=0, B-chan=2, calltype=VOICE
    Active dsl 0 CCBs = 4
    The Free Channel Mask:  0x8017FFFD
    Number of L2 Discards = 0, L2 Session ID = 1
ISDN Serial1/1:23 interface
        dsl 1, interface ISDN Switchtype = primary-ni
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
    Layer 3 Status:
        0 Active Layer 3 Call(s)
        CCB:callid=C3E8, sapi=0, ces=0, B-chan=22, calltype=VOICE
        CCB:callid=CAB4, sapi=0, ces=0, B-chan=16, calltype=VOICE
        CCB:callid=D4E7, sapi=0, ces=0, B-chan=20, calltype=VOICE
        CCB:callid=E1A2, sapi=0, ces=0, B-chan=23, calltype=VOICE
        CCB:callid=E20F, sapi=0, ces=0, B-chan=15, calltype=VOICE
        CCB:callid=E212, sapi=0, ces=0, B-chan=14, calltype=VOICE
        CCB:callid=E221, sapi=0, ces=0, B-chan=18, calltype=VOICE
        CCB:callid=EB48, sapi=0, ces=0, B-chan=21, calltype=VOICE
        CCB:callid=EB9D, sapi=0, ces=0, B-chan=19, calltype=VOICE
        CCB:callid=ED3F, sapi=0, ces=0, B-chan=12, calltype=VOICE
        CCB:callid=ED8E, sapi=0, ces=0, B-chan=11, calltype=VOICE
        CCB:callid=ED93, sapi=0, ces=0, B-chan=10, calltype=VOICE
        CCB:callid=F079, sapi=0, ces=0, B-chan=9, calltype=VOICE
        CCB:callid=F1F1, sapi=0, ces=0, B-chan=8, calltype=VOICE
        CCB:callid=F6AA, sapi=0, ces=0, B-chan=17, calltype=VOICE
        CCB:callid=F6CE, sapi=0, ces=0, B-chan=6, calltype=VOICE
        CCB:callid=F72F, sapi=0, ces=0, B-chan=5, calltype=VOICE
        CCB:callid=F8D7, sapi=0, ces=0, B-chan=7, calltype=VOICE
        CCB:callid=F9BC, sapi=0, ces=0, B-chan=13, calltype=VOICE
        CCB:callid=FD0E, sapi=0, ces=0, B-chan=4, calltype=VOICE
        CCB:callid=FD25, sapi=0, ces=0, B-chan=2, calltype=VOICE
        CCB:callid=FDF9, sapi=0, ces=0, B-chan=1, calltype=VOICE
        CCB:callid=809C, sapi=0, ces=0, B-chan=3, calltype=VOICE
    Active dsl 1 CCBs = 23
    The Free Channel Mask:  0x80000000
    Number of L2 Discards = 0, L2 Session ID = 1
    Total Allocated ISDN CCBs = 27

At this time, there are three active calls on the device. Why is dsl 1 showing all 23 CCBs active when there are no calls on that pri?

[hsgoraya77]

Also, all channels show up in service:-

Router#

#sh isdn service
PRI Channel Statistics:
ISDN Se1/0:23, Channel [1-24]
  Configured Isdn Interface (dsl) 0
   Channel State (0=Idle 1=Proposed 2=Busy 3=Reserved 4=Restart 5=Maint_Pend)
    Channel :  1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
    State   :  2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 3
   Service State (0=Inservice 1=Maint 2=Outofservice 8=MaintPend 9=OOSPend)
    Channel :  1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
    State   :  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2
ISDN Se1/1:23, Channel [1-24]
  Configured Isdn Interface (dsl) 1
   Channel State (0=Idle 1=Proposed 2=Busy 3=Reserved 4=Restart 5=Maint_Pend)
    Channel :  1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
    State   :  2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3
   Service State (0=Inservice 1=Maint 2=Outofservice 8=MaintPend 9=OOSPend)
    Channel :  1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
    State   :  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2

[paolo bevilacqua]

Data corruption bug. It also shows 3 calls then it lists 4.

Update IOS, and reload router.

[hsgoraya77]

Are you aware of a bug id or come across such an experience?    

[paolo bevilacqua]

Yes, there have been many bugs in ISDN code.

[hsgoraya77]

Well, I tried "shut" and "no shut" on the controllers and it has cleared the hung up bearer channels. I have to keep monitoring to see if it comes back. At that point, I will try upgrading.

Do you recommend any specific build. I am running 12.4 4 T8 on a IAD2431-1T1E1

[paolo bevilacqua · Accepted solution]

Will probably creep back in.

I recommend 15.0(1)M3 thta is stable and the only one with MD qualification.

[hsgoraya77]

Thanks! It seemed like it came back but I just checked again and it's holding up.

I wonder if Cisco would build a "realtime" option in such commands to see what's happening in realtime instead of contantly hitting the up arrow and enter key.

Adtran has that and it works like a charm.

With your "Hall of Fame" status, maybe you can make a recommendation if you like the idea.

[paolo bevilacqua]

For monitoring a PRI in real time, you would use SNMP and some graphical application.

With the systems of today it is easy to build your own even.

Consider, what had happened in your case is an abnormal situation and for that reasons does not need any monitoring.

Unfortunately, Cisco does not listen to me more than anybody else (except for million dollars accounts and certain visionaries).

Thanks for the nice rating and good luck!