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

Aamer,
 
> > WHat is that implementations generally do when they have multiple prefixes
> > associated
> > with a single interface.
> 
> I think you want to say same next-hop rather than interface.

No, I mean the same interface. What difference does it make to me if i have a prefix
which has different next-hops and both the next-hops are reachable to me thru the same
interface/sub-interface (e.g. ethernet)

> 
> >DO they advertise a single label for all these routes
> > OR does it
> > advertise multiple unique labels per route?
> > 
> > I think it should be the former.
> > 
> > Is there any case when one might want to do the latter?
> 
> In general, cases where it might be useful to be able to distinguish between
> prefixes.
> 
> One specific case is in mpls-vpn if the prefix is reachable via two
> different  nexthop's on the same PE. This allows the PE to loadshare between
> the two next-hops.

PE can only load share if both the next-hops are accessable through different interfaces.
Thus in this case too, the PE will be advertisiing differnet labels per interface. IMHO
the label should be associated with an interface. So that when this PE receives a MPLS
packet with this label, it does nothing but pushes the native IPv4 packet out on the
associated interface!

Am i missing something?

Regards,
John Smith 


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