Re: draft-ietf-l3vpn-2547bis-mcast-07.txt

[Yakov Rekhter <[e-mail]>]

Rakesh,

> Hi Team
> 
> In section 6.4.1 ,
> 
> If an RSVP-TE P2MP LSP is being used to carry a set of C-flows
>    traveling along a bidirectional C-Tree, using the procedures of
>    section 11.2, the head end MUST include the PE Distinguisher Labels
>    attribute in its I-PMSI Intra-AS A-D route or S-PMSI A-D route, and
>    MUST provide an upstream-assigned label for each PE that it has
>    selected as the upstream PE for the C-tree's RPA ("Rendezvous Point
>    Address").  See section 11.2 for details.
> 
> Is this always necessary to put PE Distinguisher Labels Attribute ?

*Under the conditions you quoted above* (P2MP LSP is being used to
carry a set of C-flows traveling along a bidirectional C-tree, using
the procedures of section 11.2) it is always necessary to carry PE
Distinguisher Labels Attribute. See 11.2.2 for more details on this
attribute, as well as on its usage.

Yakov.