[j-nsp] Problems with MPLS

[Hannes Gredler]

dermont,

how can two routers connect the the _same_ logical interface ?

i.e. could you provide a show isis adj / show ospf neigh of the core router ?

show mpls lsp ingress extensive issued on the edge routers would also
give valuable hints whats and where somthing is broken ...

/hannes

Dermot Williams wrote:
> Hi,
> 
>  
> 
> OK, another MPLS problem. This one is pretty serious and is affecting
> rollout on our network, so it would be great if someone could give me a
> dig out. 
> 
>  
> 
> The gist of the problem is this: I've a core router, let's call it
> Core_A. I've also got three edge routers, let's call these Edge_A,
> Edge_B and Edge_C. Edge_A and Edge_B both connect to the same logical
> interface on Core_A. Both Edge_A and Edge_B need to have an LSP built to
> Edge_C. Unfortunately only of one of these LSPs works in both
> directions. For the purpose of this example, let's assume that this is
> Edge_A-to-Edge_C. For Edge_B-to-Edge_C, the LSP only comes up in one
> direction (Egress from the point of view of Edge_B).
> 
>  
> 
> I am using the same configuration for these LSPs that I have used in
> various other places on the network. The only difference in this
> instance is the fact that Core_A has two neighbours on the same logical
> interface.
> 
>  
> 
> This is probably a little confusing, so I've attached a diagram that I
> hope explains things a little better. Any help that anyone can give me
> on this would be hugely appreciated.
> 
>  
> 
> Regards,
> 
>  
> 
> Dermot Williams
> 
> Senior Network Engineer
> 
> Irish Broadband Internet Services Ltd.
> 
> 
> 
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