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LDP FEC NextHop

  • From: Sean Crocker <crockers@trinicom.com>
  • Date: 7 Dec 2001 02:55:00 -0000
  • X-Comment: This message was sent from 208.232.192.18

Vishal,

>   Suppose a non-directly connected LDP peer (address
>   list contains only 9.1.1.1/32) sends a 
>   label mapping to a address FEC 7.0.0.0/8 with a
> label
>   '100'.
>   The routing table entry for 7.0.0.0/8 points
>   to a immediately connected gateway 11.1.1.1/32, 
>   should one conclude that the binding is not usable 
>   ( since the peer is not the nexthop for the FEC?)

Yes.  See RFC3036 A.1.2. Receive Label Mapping, specifically LMp.11 and LMp.12.

>   Does 'Nexthop to the FEC' mean necessarily 
>   nexthop as seen by the routing table...?

Yes.

>   As per draft-martini 'FEC' could be a L2 VC,
>   what does 'Nexthop to FEC' mean in this case...?
>   I am guessing 'NextHop' is the 'VC-tunnel'
> endpoint..

I suppose that's correct at the VC LSP level, keeping in mind that there's a recursed-to
nexthop at the tunnel LSP level.

Sean
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