Re: Just shy of OT MPLS Question

<nobody_at_groupstudy.com> wrote on 12/22/2009 02:36:40 AM:

> I'm also a bit confused with the term MPLS Tunnels. Do you mean a
> normal MPLS VPN or a TE Tunnel, since both require totally different
things.
>
Neither, I'm not that familiar with the term. I always took tunnel to
mean anything encapsulated in something else and thus interchangeable with
LSP. In other words I meant LSP's.

> For IBGP it's not really recommended and same as Bryan said, I never
> tested this. It does is an implementation for Inter-AS
> configurations to use the BGP send-label command to advertise
> prefixes and labels in BGP, which works :-)
>

Are these inner or outer labels? Inner with one outer to keep you from
having to run LDP with a foreign router? I would assume they are the inner
labels and then your RSVP/LDP protocol would take care of the outer labels
used to reach the next AS's router.

> For TE tunnels, you cannot allocate labels through BGP, but solely
> through RSVP and a link-state protocol. This is because of he
> dynamic behavior and the SPF protocol that TE uses to calculate
> paths throughout the network. A distance vector protocol like BGP
> would not work as within a link-state you have the full topology of
> the network available to calculate your path on (within an area of
course).

Throw TE (and usefullness with it...) out the window for a minute. For
example you can create a flat MPLS network using static routes.

>
> So for MPLS VPN's this should work, advertise the PE loopbacks in
> IPv4 BGP and advertise VPN labels in VPNv4 BGP. You should run BGP
> on the P of course then. Cool thing to lab it up :-)

Could you use BGP as the only protocol and just enable LDP on each
interface to do the switching? Assuming next hop reachability was taken
care of (without static routes). Don't have any SP stuff setup right now
or I'd try it out myself.

>
>
> --
> Regards,
>
> Rick Mur
> CCIE2 #21946 (R&S / Service Provider)
> Sr. Support Engineer  IPexpert, Inc.
> URL: http://www.IPexpert.com
>
> On 22 dec 2009, at 06:29, Scott Morris wrote:
>
> > Yup, you can.
> >
> >
> >
> >
> > *Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider)
#4713,
> >
> > JNCIE-M #153, JNCIS-ER, CISSP, et al.
> >
> > JNCI-M, JNCI-ER
> >
> > evil_at_ine.com
> >
> >
> > Internetwork Expert, Inc.
> >
> > http://www.InternetworkExpert.com
> >
> > Toll Free: 877-224-8987
> >
> > Outside US: 775-826-4344
> >
> >
> > Knowledge is power.
> >
> > Power corrupts.
> >
> > Study hard and be Eeeeviiiil......
> >
> >
> >
> > JR Garcia wrote:
> >> pretty sure you can exchange labels via ibgp using the "send-label"
> >> command. Eg: neighbor 1.1.1.1 send-label
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
Received on Tue Dec 22 2009 - 21:52:37 ART