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Cisco AS5300 Series Universal Gateways

Field Notice: FN - 62247 - Cisco IOS Software 12.3, 12.3(T), 12.4 and 12.4(T) - ISDN B-Channels Remain in Out of Service (OOS) State After Reload or Line State Change on AS5xxx With RLM - IOS Update Required


November 17, 2005

NOTICE:

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Products Affected

Product

Comments

12.3(11)T - 12.3(11)T and later

Routers running IOS versions 12.3(11)T or later SW

12.3(16) - 12.3(16) and later

Routers running IOS versions 12.3(16) or later SW

12.4(02)T01 - 12.4(02)T01 and earlier

Routers running IOS versions 12.4(02)T01 and earlier SW

12.4(3) - 12.4(3) and earlier

Routers running IOS versions 12.4(3) and earlier SW

Problem Description

On Cisco Systems AS5000 Series Universal Gateways using Redundant Link Manager (RLM), ISDN B channel states may remain in Out of Service (OOS) after reload or line state change on T1/E1. This problem affects SS7 Interconnect for access server and Voice gateway solutions while in Nailed Mode.

Background

This issue is not present in Cisco IOS® Software versions before 12.3(16). It is present in 12.3(16).

Problem Symptoms

ISDN B-channels remain in Out of Service (OOS) state after reload.

  • Call processing may be impacted.

  • ISDN B-channel will remain in OOS state.

Example of output for router running 12.3(16):

After no shut the controller sent GROUP SERVICE with all zeros as highlighted in bold. This means all channels are out of service as seen with the IOS command debug isdn q931.

Process captured for 12.3(16) - Not working -- circuits stay in blocked state
=================================================
mssol-5350-74a(config)#controller t1 3/3
mssol-5350(config-controller)#shut
mssol-5350(config-controller)#
*Jan 31 16:42:23.283: %CONTROLLER-5-UPDOWN: Controller T1 3/3, changed state to administratively down
*Jan 31 16:42:23.283: ISDN Se3/2:23 SC Q931: TX -> GROUP SERVICE pd = 67  callref = 0x0000 
     Interface Service i = 0x0000000000
*Jan 31 16:42:23.307: ISDN Se3/2:23 SC Q931: RX <- GROUP SERVICE ACK pd = 67  callref = 0x8000 
        Interface Service i = 0x0000000000
*Jan 31 16:42:23.307: ISDN Se3/2:23 SC Q931: do_statistics: 0x43 message 0x0B not counted
*Jan 31 16:42:24.327: ISDN Se3/2:23 SC Q931: RX <- GROUP SERVICE pd = 67  callref = 0x0000 
        Interface Service i = 0x00FFFFFF00
*Jan 31 16:42:24.327: ISDN Se3/2:23 SC Q931: TX -> GROUP SERVICE ACK pd = 67  callref = 0x8000 
     Interface Service i = 0x0000000000
*Jan 31 16:42:24.327: ISDN Se3/2:23 SC Q931: do_statistics: 0x43 message 0x0B not counted
*Jan 31 16:42:27.343: ISDN Se3/2:23 SC Q931: RX <- GROUP SERVICE pd = 67  callref = 0x0000 
        Interface Service i = 0x0000000000
*Jan 31 16:42:27.347: ISDN Se3/2:23 SC Q931: TX -> GROUP SERVICE ACK pd = 67  callref = 0x8000 
     Interface Service i = 0x0000000000
*Jan 31 16:42:27.347: ISDN Se3/2:23 SC Q931: do_statistics: 0x43 message 0x0B not counted
mssol-5350(config-controller)#

Output from the Media Gateway Controller shows all 24 channels:

  • PST Primary Service State of IS which means that the traffic channel or CIC is IS and fully operational.

  • CALL State is IDLE showing that circuit is available for use.

  • BLK Circuit Block type is in NONE state which means that there is no block on the Circuit Identification Code (CIC) and DS0 is available for use.

vnt-pgw-10.c mml> rtrv-tc:ss7svc-sc16
   MGC-01 - Media Gateway Controller 2005-09-08 15:36:37.694 EDT
M  RTRV
   "ss7svc-sc16:CIC=1,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=2,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=3,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=4,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=5,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=6,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=7,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=8,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=9,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=10,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=11,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=12,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=13,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=14,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=15,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=16,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=17,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=18,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=19,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=20,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=21,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=22,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=23,PST=IS,CALL=IDLE,BLK=NONE"
   "ss7svc-sc16:CIC=24,PST=IS,CALL=IDLE,BLK=NONE"
(other output omitted)   

With the interface in a shutdown state, while using the IOS command show isdn serv the channel state remains as 2 meaning that it is believed to be out of service.

mssol-5350-74a#show isdn serv
PRI Channel Statistics:
ISDN Se3/2:23 SC, 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   :  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
   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 0 
   Channel blocked? (0=No 1=Yes)
    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
               0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
ISDN Se3/3:23 SC, 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   :  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
   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   :  2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 
   Channel blocked? (0=No 1=Yes)
    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
               1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 

Similar output shows that after issuing the IOS command no shut the Interface Service is still 0's. Under normal circumstances it should indicate 0x00FFFFFF00 for 24 channels in service, which is the total number of B channels of a T1 interface. For E1 interface it should indicate 0x00FFFFFFFF, 32 channels.

mssol-5350-74a(config)#controller t1 3/3
mssol-5350(config-controller)#no shut
mssol-5350(config-controller)#
mssol-5350-74a#
mssol-5350-74a#
mssol-5350-74a#
*Jan 31 16:43:34.327: %SYS-5-CONFIG_I: Configured from console by vty0
*Jan 31 16:43:45.203: %CONTROLLER-5-UPDOWN: Controller T1 3/3, changed state to up
*Jan 31 16:43:45.203: ISDN Se3/2:23 SC Q931: TX -> GROUP SERVICE pd = 67  callref = 0x0000 
     Interface Service i = 0x0000000000
*Jan 31 16:43:45.215: ISDN Se3/2:23 SC Q931: RX <- GROUP SERVICE ACK pd = 67  callref = 0x8000 
        Interface Service i = 0x0000000000
*Jan 31 16:43:45.215: ISDN Se3/2:23 SC Q931: do_statistics: 0x43 message 0x0B not counted
*Jan 31 16:43:46.343: ISDN Se3/2:23 SC Q931: RX <- GROUP SERVICE pd = 67  callref = 0x0000 
        Interface Service i = 0x00FFFFFF00
*Jan 31 16:43:46.347: ISDN Se3/2:23 SC Q931: TX -> GROUP SERVICE ACK pd = 67  callref = 0x8000 
     Interface Service i = 0x0000000000 
*Jan 31 16:43:46.347: ISDN Se3/2:23 SC Q931: do_statistics: 0x43 message 0x0B not counted

Workaround/Solution

Work around: Manually issue the IOS command shut / no shut on affected serial interface until next occurrence.

Solution: This issue will be fixed in Cisco IOS software releases 12.3(17), 12.3(11)T9, 12.4(5) and 12.4(7), 12.4(2)T3 and later.

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS

Description

CSCsb81394 (registered customers only)

Shut/No Shut of T1/E1 controller keeps B-Channels in OOS state. (Duplicated by CSCsb06765)

CSCsb89936 (registered customers only)

Channel left in OOS state after reload

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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