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Webcast-Catalyst9k
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ISDN layer 2 bouncing. SPID problem

One of the SPIDs on our 3845 is going vlaid and establishes connectivity and the next moment goes invalid. Therefore Layer 2 is just bouncing like every 4 secs. I had telco test, verified SPIDs. I am also observing some strange 'show isdn status' output.

When both SPIDs are valid the output seems normal. But when the second SPID becomes invalid layer3 in the 'show isdn status' is as follows:

Layer 3 Status:

0 Active Layer 3 Call(s)

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

Call

Active dsl 0 CCBs = 1

The Free Channel Mask: 0x80000003

Shouldn't CCB be allocated only when there is an active call? I am little confused with this output actually.

Any ideas?

Thanks,

Ranjani

2 REPLIES

Re: ISDN layer 2 bouncing. SPID problem

Ranjani,

Can you post a complete sh isdn status output (when its valid and not valid). Also include a debug isdn q921 output.

New Member

Re: ISDN layer 2 bouncing. SPID problem

Thanks for your reply. Unfortunately I cannot issue a debug command right now..but here is the other output you requested. Thanks

Oct 14 12:13:03.896 PDT: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BRI0/0/0, TEI 87 changed to down

Oct 14 12:13:07.936 PDT: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/0, TEI 87 changed to up

Oct 14 12:13:09.916 PDT: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BRI0/0/0, TEI 87 changed to down

PHX1-MDFA1-ART1#sh isdn status

Global ISDN Switchtype = primary-4ess

ISDN BRI0/0/0 interface

dsl 0, interface ISDN Switchtype = basic-ni

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 86, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI = 87, Ces = 2, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI 86, ces = 1, state = 5(init)

spid1 configured, no LDN, spid1 sent, spid1 valid

Endpoint ID Info: epsf = 0, usid = 70, tid = B

TEI 87, ces = 2, state = 5(init)

spid2 configured, no LDN, spid2 sent, spid2 valid

Endpoint ID Info: epsf = 0, usid = 71, tid = B

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x80000003

%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 1. Layer 3 output may not apply

ISDN Serial0/2/0:23 interface

dsl 1, interface ISDN Switchtype = primary-4ess

L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003

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)

Active dsl 1 CCBs = 0

The Free Channel Mask: 0x807FFFFF

Number of L2 Discards = 0, L2 Session ID = 12

Total Allocated ISDN CCBs = 0

PHX1-MDFA1-ART1#

PHX1-MDFA1-ART1#sh isdn status

Global ISDN Switchtype = primary-4ess

ISDN BRI0/0/0 interface

dsl 0, interface ISDN Switchtype = basic-ni

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 86, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI = 87, Ces = 2, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI 86, ces = 1, state = 5(init)

spid1 configured, no LDN, spid1 sent, spid1 valid

Endpoint ID Info: epsf = 0, usid = 70, tid = B

TEI 87, ces = 2, state = 4(await init)

spid2 configured, no LDN, spid2 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 (BR0/0/0) SPC Call

Active dsl 0 CCBs = 1

The Free Channel Mask: 0x80000003

%Q.931 is backhauled to Q.931 0x0000 on DSL 1. Layer 3 output may not apply

ISDN Serial0/2/0:23 interface

dsl 1, interface ISDN Switchtype = primary-4ess

L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003

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)

Active dsl 1 CCBs = 0

The Free Channel Mask: 0x807FFFFF

Number of L2 Discards = 0, L2 Session ID = 12

Total Allocated ISDN CCBs = 1

PHX1-MDFA1-ART1#

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