RE: [MPLS-OPS]: Nos of Labels in CE

Vinay,
 
> Either you have one label per route and associate the next hop L2
> information (usually the destination mac address) with the label and save it
> in the lookup table OR you pop the label and do a lookup on the IP DA to
> figure out the next hop that you can ARP (assuming it is still ethernet) to
> get the next hop L2 information.

The latter suits fine to me.

> 
> However, if you have point to point link (say PPP) as the outgoing
> interface, then it might make some sort of sense to associate label binding
> for IP routes based on outgoing links. But if you do that you lost your
> ability to load balance unless you can figure out a way to associate
> multiple label bindings for the same IP routes emanating from different
> interfaces.

I think i wasnt clear in stating my problem. What i want to do is to bind a label to an
interface, rather than the routes which i recieve. Say, i have a BGP CE peering over an
interface - What this means is that my BGP peering takes place through one interface. I
will now bind one label Lx for this interface. I will be advertising this label for all
the routes which i learn from this peer as i know it will always be this peer which i
will use as my next-hop (as its an EBGP peer).

Is this correct?

Is it okay to associate a Label Lx with a BGP CE peer (implicitly an interface) and to
always use when i need to advertise routes learnt from this peer.

Lets verify that data forwarding will be done correctly?

If this router recieves a MPLS packet with the BGP label as Lx, it will simply pop off
this label and push the native IPv4 packet on the interface over which the BGP peering
takes place. This packet when reaches the EBGP CE peer, will decide where it needs to
forward this packet.

I think it works fine - and thus my idea of binding an interface to a Label!!

Does anyone see any problems in this?

Regards,
JOhn Smith




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