Re: mpls vpn's

thanks Joe

On 15 May 2013 12:44, <marco207p_at_gmail.com> wrote:

> Via the CEF/LFIB.
>
>
> Joe Sanchez
> Sent from my iPad
>
> On May 15, 2013, at 5:48 AM, Paul Cocker <groupstudy_at_paulcocker.net>
> wrote:
>
> > Hi Group, hope you don't get duplicates of this mail. I've just switched
> to
> > another email as nothing was getting though.
> >
> > Wonder if someone can clear up a query for me. I'm working through
> Narbiks
> > MPLS section in his R&S workbook. I'm on the start of the MPLS VPN
> section.
> >
> > R1 ----- R3 ------ R2 ------- R4 ------ R5
> >
> > r1/r5 are CE's
> > r3 / r4 are PE's
> > R2 is a P
> >
> > On one PE , we have the following route for the other end of the network
> on
> > R1.
> >
> > R4#sh ip bgp vpnv4 vrf CB 1.0.0.0
> > BGP routing table entry for 1:20:1.0.0.0/8, version 8
> > Paths: (1 available, best #1, table CB)
> > Not advertised to any peer
> > Local, imported path from 1:10:1.0.0.0/8
> > 3.3.3.3 (metric 3) from 3.3.3.3 (3.3.3.3)
> > Origin incomplete, metric 1, localpref 100, valid, internal, best
> > Extended Community: RT:1:100
> > mpls labels in/out nolabel/303
> >
> > So it uses label 303 for this. But how does it know which interface to
> > use? I can't find 303 in the following tables,
> >
> > sh mpls forwarding table
> > sh mpls ldp bindings
> > sh mpls ip binding
> >
> > nor can I find it mentioned in the tables on the P router.
> >
> > I'm obviously missing something, as it works just fine end to end! Can
> > someone explain how this works in LDP all the way to R1?
> >
> > Paul
> >
> >
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Received on Wed May 15 2013 - 12:44:57 ART