Re: MPLS VPN: Why two lables?

I think that the problem is with overlapping.

LDP bases it's LIB on RIB. RIB permits having two same prefixes. But
LDP relays on IGP shortes path and that's why ( I belive ) it chooses
only one prefix from multiple. So, probably, LDP is based on the FIB,
not the RIB.

Well, overlapping is the only reason, I got it. That's why we are
using second label, to hide overlapping prefixes from LDP.

Thanks everyone =)

On 3 July 2011 20:44, Vladimir Osipenko <tiffolk_at_gmail.com> wrote:
> Hi, Guys!
>
> Despite reading books and articles, I simply don't get it: why we must
> use two lables for MPLS VPN instead of using one label, but without
> PHP?
>
> Is it because every P router will need to know customer routes? Any
> other reasons?

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Received on Sun Jul 03 2011 - 21:07:00 ART