ISDN - Spid 2 (Await Establishment)

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Jun 6th, 2007
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I have a number of Cisco 2811 routers at various remote locations. Every one of them experiences this same issue. I have upgraded IOS twice on them to no avail.


Upon router boot, SPID1 establishes but SPID2 stays in Awaiting Establishment.


Example:

Global ISDN Switchtype = basic-ni

ISDN BRI0/1/0 interface

dsl 2, interface ISDN Switchtype = basic-ni

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 88, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI 88, ces = 1, state = 8(established)

spid1 configured, spid1 sent, spid1 valid

Endpoint ID Info: epsf = 0, usid = 0, tid = B

TEI Not Assigned, ces = 2, state = 3(await establishment)

spid2 configured, spid2 NOT sent, spid2 NOT valid

Layer 3 Status:

0 Active Layer 3 Call(s)

CCB:callid=0, sapi=0, ces=2, B-chan=0, calltype=INTERNAL (BR0/1/0) SPC C all

Active dsl 2 CCBs = 1

The Free Channel Mask: 0x80000003



If I shut the BRI interface, clear the module, and un shut it, the 2nd spid established without issue.


Example:


Global ISDN Switchtype = basic-ni

ISDN BRI0/1/0 interface

dsl 2, interface ISDN Switchtype = basic-ni

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 88, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI = 89, Ces = 2, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI 88, ces = 1, state = 8(established)

spid1 configured, spid1 sent, spid1 valid

Endpoint ID Info: epsf = 0, usid = 0, tid = B

TEI 89, ces = 2, state = 5(init)

spid2 configured, spid2 sent, spid2 valid

Endpoint ID Info: epsf = 0, usid = 1, tid = B

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 2 CCBs = 0

The Free Channel Mask: 0x80000003

Total Allocated ISDN CCBs = 0



Current software revision is:

c2800nm-advipservicesk9-mz.124-13b.bin


Any suggestions of where to look next? It doesn't matter who the ISDN carrier is, they all do this at boot.


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jasonrandolph Wed, 06/06/2007 - 09:45
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Correction, I had to clear the interface on this particular router twice in order to establish the 2nd SPID


ISDN BRI0/1/0 interface

dsl 2, interface ISDN Switchtype = basic-ni

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 88, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI = 89, Ces = 2, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI 88, ces = 1, state = 8(established)

spid1 configured, spid1 sent, spid1 valid

Endpoint ID Info: epsf = 0, usid = 0, tid = B

TEI 89, ces = 2, state = 8(established)

spid2 configured, spid2 sent, spid2 valid

Endpoint ID Info: epsf = 0, usid = 1, tid = B

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 2 CCBs = 0

The Free Channel Mask: 0x80000003

Total Allocated ISDN CCBs = 0


sundar.palaniappan Wed, 06/06/2007 - 11:10
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You are running into this bug. Workaround options are listed at the bottom.


CSCsf04593 Bug Details


2nd SPID always stays INVALID until sh/no shut on the bri interface

Basic Description :

-----------------

When a known working ISDN BRI line is plugged into a router, the

2nd SPID always stays INVALID as shown by "show isdn status" :


spid2 configured, spid2 NOT sent, spid2 NOT valid


As a result only one (the first) B channel can make/receive calls.


Conditions:

----------

The problem is not seen if you are running some 12.3 code instead of

12.4.


Symptoms:

--------

-Similar to CSCsa87703.

-However, the problem is seen on both the version 2 (WIC-1B-U-V2) and old

version 1 cards (NM-xB-U).


Workaround:

----------


-Configure "isdn twait-disable" under the BRI interface, or

-Enable isdn q921/q931 debugs. Enabling the isdn debugs and doing a shut/

no shut on the BRI makes the 2nd SPID goes valid (just as it was in

CSCsa87703), or

-Downgrade to 12.3



HTH


Sundar


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