[cisco-voip] Problem bringing up L2

[Aman Chugh]

Doing a no mgcp and mgcp would bring up layer 2 on your router, I have ran
across this a couple of times. Didnt get deep into it to find out a
permanent fix.

Aman


On 10/11/07, Caines, Max <Max.Caines at wlv.ac.uk> wrote:
>
>  Hi
>
> I don't normally deal with VoIP, so my apologies if I make simple errors.
> We have a 3725 router with a VWIC handling calls for one of our sites,
> talking to CallManager 4.1. It stopped working the other day, and after
> getting in the telco, who couldn't find anything wrong, and our Cisco
> support firm (ditto) the latter sent me a couple of URLs, one of which was
> to an article on this list. It pointed me to  temporary fix, but not a
> permanent one.
>
> The problem is that when the router boots or the circuit is brought up,
> the L2 link from the router to the telco switch won't come up. Below is the
> output from "show isdn status":
>
> Global ISDN Switchtype = primary-net5
>
> %Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may
> not apply
>
> ISDN Serial0/0:15 interface
>         dsl 0, interface ISDN Switchtype = primary-net5
>         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 = TEI_ASSIGNED
>     Layer 3 Status:
>         0 Active Layer 3 Call(s)
>     Active dsl 0 CCBs = 0
>     The Free Channel Mask:  0xFFFF7FFF
>     Number of L2 Discards = 0, L2 Session ID = 1
>     Total Allocated ISDN CCBs = 0
> What I found was that I could bring the link up by doing:
>
>  conf t
> int ser 0/0:15
> no isdn bind-l3 ccm-manager
> shut
> no shut
> isdn bind-l3 ccm-manager
>
> After that the status is:
>
> Global ISDN Switchtype = primary-net5
> ISDN Serial0/0:15 interface
>         dsl 0, interface ISDN Switchtype = primary-net5
>     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:  0xFFFF7FFF
>     Number of L2 Discards = 0, L2 Session ID = 2
>     Total Allocated ISDN CCBs = 0
> However, if I reboot the router it goes back to the previous state. This
> clearly isn't a good situation. I've upgraded the router to 12.3(14)T7,
> the latest in its train, but this makes no difference. Is this a Cisco bug,
> or is there something else I should try? The config is attached, if it helps
>
> Thanks
>
> Max Caines
> IT Services, University of Wolverhampton
> Wolverhampton, West Midlands WV1 1SB
> Tel: 01902 322245 Fax: 01902 322777
>
>
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>
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