Re: [Idr] 6PE-Alt draft

Hi Jan,

Unlike in BGP MPLS IP VPN, the label does not tell any interface as we
finally look up the only routing table the IPv6 routing table. We do
not have the VRF concept here. That is the reason we do not need any
presignaled label. The 6PE draft mentions why we need the top label
very clearly.

However they have wrongly decided to signal a label with each route
instead of just using the IPv6 Explicit NULL label.

Thanks,
Vishwas

On Jan 31, 2008 9:00 AM, Jan Novak <jjjnovak@hotmail.com> wrote:
>
>
>
> Hi Vishwas,
>
> I believe you refer to this part of 6PE spec:
>
>    The label bound by MP-BGP to the IPv6 prefix indicates to the egress
>    6PE Router that the packet is an IPv6 packet.  This label advertised
>    by the egress 6PE Router with MP-BGP MAY be an arbitrary label value,
>    which identifies an IPv6 routing context or outgoing interface to
>    send the packet to, or MAY be the IPv6 Explicit Null Label.  An
>    ingress 6PE Router MUST be able to accept any such advertised label.
>
> I don't know what is the envisaged use of Explicit Null here - but I would think
> it is for some other purposes since to deliver the packet to the VPN this is
> still needed "identifies an IPv6 routing context or outgoing interface to".
>
> Jan
>
>
>
>
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