Re: [trill] DTree Questions Regarding Router Capability TLV

Please see in-line.

Thanks,
Ayan

On Tue, Dec 18, 2012 at 7:09 AM, Thomas Narten <narten@us.ibm.com> wrote:

> Ayan Banerjee <ayabaner@gmail.com> writes:
>
> > On Mon, Dec 17, 2012 at 1:50 PM, Arnel Lim <ALim@extremenetworks.com>
> wrote:
>
> > > 3) ALL Rbridges, RB2, that ingress native traffic MUST send
> > >    TREES-USE-ID sub-TLV, correct?  This is required for RPF check
> > >    used by adjacent RBridges.
>
> > > “each RBridge RB2 MUST announce which trees RB2 may choose when
> > >     RB2 ingresses a multi-destination packet.”
>
> > [Ayan] No, this is not accurate. If ingress nodes use this TLV, it
> > may help other nodes to be more strict in accepting packets from the
> > relevant multi-destination trees. If it does not send out this TLV,
> > then it implies that a node may use all multi-destination trees.
>
> So, are you saying that if RB doesn't announce the TLV, all other RBs
> must assume that RB2 can/will ingress multi-destination packets?
>
> If so, I understand the reasoning for why the RB should effectively
> announce a TLV saying "I'm not ingressing anything". But does the spec
> actually say that transit RBs SHOULD/MUST advertise a TLV with a
> (presumably) empty list in this case?
>
> [Ayan] Probably not. However, I would consider the presence of the
statement to be an optimization that would be nice to have - so even if it
is there, it will probably be a "SHOULD" and not a "MUST".

> Thomas
>
>
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