[c-nsp] LDP sessions established to non directly connected routers, when new link is activated

[Nick Hilliard]

On 25/09/2015 03:23, CiscoNSP List wrote:
> To answer your question - Yes - The ME02, that connects to the ASR1006
> has a vlan interface....so we may be getting hit with this bug,
> although, we are using the link that runs through the 2
> ME3600's(MPLS/OSPF/BGP) currently, without issue?
> 
> re MPLS ping - Very strange - It is saying it is up on both routers(sh
> mpls ldp nei, and logs report LDP nei is up on both routers, once mpls
> ip is enabled on each Int), but I cannot mpls ping the loop (From ASR2
> POPA -> ASR1006 POPD)?

as adam suggested, this sounds like it could be CSCui74304:

> Symptom: Remote MPLS ping fails in LFA when SVI is one of the core
> interfaces.
>
> Conditions: This issue occurs when the SVI is one of the core
> interfaces with IPFRR enabled.
>
> Workaround: FRR over SVI is currently not supported. So, below
> workarounds can be applied to mitigate this issue.
>
> For OSPF:
>
> ip ospf fast-reroute per-prefix protection disable
>
> For ISIS:
>
> isis fast-reroute protection level-1 disable
>
> isis fast-reroute protection level-2 disable
>
> Isis fast-reroute protection disable
>
> Use clear ip ospf/isis process command after disabling the FRR feature
> to access respective IGP functionalities.

The bug seems to be marked private on the cisco bug tool, but this info
comes from release notes for 15.4(1).

Nick