From: Rich Collins (nilsi2002@gmail.com)
Date: Wed Jul 23 2008 - 19:51:40 ART
I guess the P router could do some addtional stacking of tags instead of
just swapping. That could increase the size beyond 1504 bytes.
I've just done a bit of MPLS in the past and am starting to review it again.
-Rich
On 7/22/08, Peter Svidler <doubleccie@yahoo.com> wrote:
>
>
>
>
>
> how is it different in a topology with P router in between and without P
> router in between affect the behaviour of the PE routers ?
>
>
>
> do you have any link that describe this ?
>
>
>
> thanks in advance
>
>
>
>
>
> --- On *Mon, 7/21/08, Rich Collins <nilsi2002@gmail.com>* wrote:
>
> From: Rich Collins <nilsi2002@gmail.com>
> Subject: Re: VPNv4 question
> To: "Peter Svidler" <doubleccie@yahoo.com>
> Cc: ccielab@groupstudy.com, security@groupstudy.com
> Date: Monday, July 21, 2008, 2:41 PM
>
> Usually you see the peering of the VPN4 via loopback interfaces in such a
> scenario. Is there a situation where you would not want to do it that way?
> So you are also describing a topology with PE routers and no P routers?
>
> -Rich
>
> On Mon, Jul 21, 2008 at 3:13 AM, Peter Svidler <doubleccie@yahoo.com>
> wrote:
>
> > Folks ,
> >
> > I have confusion regarding VPNv4 which maybe someone can clarify .
> >
> > lets say i have two AS where R2 and R4 are the PEs connecting the
> providers
> > together and R2-R4 are peering IPV4 and VPN4 from their direct interface
> IP
> > address
> >
> > R2 is peering VPNv4 with R4 to exchange teh customer prefixes from both
> > sides
> > ..i have two points to confirm if possible
> >
> >
> > 1- if R2 and R4 are peering the VPNv4 from their loopbacks instead of
> > direct
> > interface , in this case I advertise the loopbacks via IPV4 and send-label
> > via
> > IPV4 BGP , however the label does not pop up automatically in the LFIB (
> > redistribution into IGP is needed) , however the LSP is complete between
> R2
> > and R4 because customer can ping each other ...can anyone explain why ?
> > does
> > it have anything to do with that R2 and R4 are actually on direct link ?
> >
> > 2- in this specific situation where R2 and R4 are on directly connected
> > network , i noticed that the VPN prefixes are actually installed on the
> > mpls
> > forwarding ..while in other situation ( if the peering router is not
> > directly
> > connected ) thos prefixes do not pop up in the mpls ...is this correct?
> >
> >
> > appreciate your help
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________________________________
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