The MPLS WG Archive

[Thomas Morin <thomas.morin@orange-ft.com>]

Hi Ice,

IJsbrand Wijnands :
>
> It looks to me that the table selection is a local policy and does not  
> necessarily need to be the same on each LSR. You may want to use a  
> MuRIB between 2 LSRs just to make Multicast divert from Unicast for a  
> specific link. How these two tables are used is up to the operator to  
> define. It does not seems to be something the draft must spell out.

I don't think that the above is exact: to ensure no routing loop is
created, consistency between SPF calculated by different routers is
needed.

If, for instance, a multi-topology IGP is used, then we may want to say
that all routers should use the same topology to lookup upstream
interface to LSP root. 

We could say for instance that multicast topology MUST be used if
multi-topology ISIS is used (or an alternate new multi-topology topology
ID, if we don't like reusing the one dedicated to IP multicast).

Cheers,

-Thomas



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