The MPLS WG Archive

[Bala Rajagopalan <braja@tellium.com>]

Hi Alex,


Alex Zinin wrote:

> Bala,
>
> Note that with today BGP that border OXC will be the next-hop
> for all IP prefixes it announces to the client via the e-BGP
> session. This means that the client does not really know
> much about the egress point per prefix and hence where it should
> establish LSPs across the optical transport network unless we
> add a kind of "suggested next-hop" BGP attribute as a part
> of optical UNI (I don't think it makes sense to run e-BGP
> in the peer model) to inform the client about the egress
> points.

What you say about egress point is true. This is in fact what
we had proposed in our draft, draft-prs-optical-routing-00.ps (.txt).


>
>
> I think Curtis' point is that OXCs do not really need to
> have BGP routes in their routing table for normal operation
> of circuit provisioning protocols.

Unless someone explains what Curtis means, it's hard to
get the point (usually). {A reluctant :-) here may be added
if desired.}

Bala

>
>
> Alex.
>
> >> Optical switches are not known for the robustness of their BGP
> >> implementations if they have BGP implementations at all.  They may
> >> also have more important things to do with their CPU cycles given that
> >> they do no externalrouting at all.  It would seem to be a relly bad
> >> idea to run IBGP to the optical switches.
> >>
> >> I hope that was more clear.
>
> > Absolutely not.  It's certainly seems possible to have
> > a scenario where optical edge switches run E-BGP
> > with router clients to provide reachability information. Whether
> > the optical network is a separate AS or a sub-AS is another issue.
> > What's wrong with this?
>
> > Bala
>
> > --
>
> > Bala Rajagopalan
> > Tellium, Inc.
> > 2 Crescent Place
> > P.O. Box 901
> > Oceanport, NJ 07757-0901
> > Tel: (732) 923-4237
> > Fax: (732) 923-9804
> > Email: braja@tellium.com

--

Bala Rajagopalan
Tellium, Inc.
2 Crescent Place
P.O. Box 901
Oceanport, NJ 07757-0901
Tel: (732) 923-4237
Fax: (732) 923-9804
Email: braja@tellium.com