The MPLS WG Archive

[Giles Heron <giles@packetexchange.net>]

Gelder35@aol.com wrote:
> 
> I have a few newbie questions on vlan over mpls.
> 
> In Martini's drafts, there is a Group Id on LDP.
> The use of Group ID is not explained clearly. I
> am wondering if anybody out there can help me out
> 
> 1. How Group ID is assigned in this context?

It is a local decision as to how to assign the group ID.

Two options mentioned in the draft are:

1.  port index
2.  virtual tunnel index.

> 2. Should local group id and remote group id match?
>    Is it ok a local group has a different id than a
>    remote group?

No, they are not required to match.  So it is OK if they are different
:)

The PWE3 MIB stores both local and remote Group IDs. 

> 3. Is group id network-wide significant or node-wide
>    significant or peers-between significant?

Only between peers.  It allows a node to (for example) issue a wild-card
withdraw to a peer for all VCs with a given Group ID.

> 4. In Cisco's implementation, there is a VC ID. It
>    seems that Cisco uses VC ID to relate a local VC
>    label to a remote VC label. But VC ID is missing
>    in the LDP/RSVP for VC signalling, why?

No, VC ID is in draft-martini.  The VC ID/VC type must match (and is
unique) between the two peers.

BTW the mailing list where draft-martini gets discussed is
pwe3@ietf.org.

HTH

Giles

-- 
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Giles Heron    Principal Network Architect    PacketExchange Ltd.
ph: +44 7880 506185              "if you build it they will yawn"
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