VoIP ISDN layer 2 bouncing

Unanswered Question
Aug 23rd, 2007

We have a voice system and on of our branches will periodically loose their system.

I can see on the router that layer 2 is bouncing.

The branches have a seperate PRI for voice.

Would this be a carrier issue?

Below is what I am seeing on the interface, it will go 20 minutes with no problem, then a few days, then it will happen again.

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

y

ISDN Serial0/0/0:23 interface

dsl 0, interface ISDN Switchtype = primary-ni

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 0 CCBs = 0

The Free Channel Mask: 0x807FFFFF

Number of L2 Discards = 0, L2 Session ID = 167

Total Allocated ISDN CCBs = 0

2811-01#sh isdn stat

Global ISDN Switchtype = primary-ni

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

y

ISDN Serial0/0/0:23 interface

dsl 0, interface ISDN Switchtype = primary-ni

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 = TIMER_RECOVERY

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x807FFFFF

Number of L2 Discards = 0, L2 Session ID = 227

--More--

001772: Aug 23 09:26:53 EDT: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se0/0/0:2

3, TEI 0 changed to down

001773: Aug 23 09:26:54 EDT: %ISDN-6-LAYER2UP: Layer 2 for Interface Se0/0/0:23,

TEI 0 cha Total Allocated ISDN CCBs = 0

2811-01#sh isdn stat

Global ISDN Switchtype = primary-ni

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

y

ISDN Serial0/0/0:23 interface

dsl 0, interface ISDN Switchtype = primary-ni

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 = AWAITING_ESTABLISHMENT

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x807FFFFF

Number of L2 Discards = 0, L2 Session ID = 232

Total Allocated ISDN CCBs = 0

2811-01#sh isdn stat

Global ISDN Switchtype = primary-ni

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

y

ISDN Serial0/0/0:23 interface

dsl 0, interface ISDN Switchtype = primary-ni

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 = TIMER_RECOVERY

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x807FFFFF

Number of L2 Discards = 0, L2 Session ID = 236

Total Allocated ISDN CCBs = 0

2811-01#sh isdn stat

Global ISDN Switchtype = primary-ni

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

y

I have this problem too.
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