[c-nsp] MPLS router-ID

Mohammad Khalil eng_mssk at hotmail.com
Thu Aug 13 05:10:52 EDT 2015

 is so weird is that I have configured the mpls ldp discovery 
transport-address x.x.x.x and am still seeing the ldp hello messages 
from my side sourced from the physical IP address , why?

> From: jwbensley at gmail.com
> Date: Tue, 11 Aug 2015 18:44:34 +0100
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] MPLS router-ID
> On 11 August 2015 at 14:39, Mohammad Khalil <eng_mssk at hotmail.com> wrote:
> > I have one of my PEs already configured with a router-id (which is my private loopback interface)
> I assume you mean LDP router-id?
> > Am trying to establish xconnect with my uplink provider (which uses Juniper)
> > The SP insisted to use public IP address for LDP neighborship , I cannot change my router-id as I will lose all of my active L2VPN sessions in my network (according to what I know , I cannot have expect for one ID for my router)
> > I configured a public IP address and advertised it into BGP to my SP and the MPLS LDP session is up , but the targeted LDP session is passive !
> What you say configured a public IP, do you mean on the interface
> facing the provider and then used something like "discovery
> transport-address interface" to use the interface IP as your LDP
> router-id?
> Also why have you originated it into BGP? If you are using the public
> on on the interface facing your provider they should know IP because
> its directly connected.
> On paper this configuration works but I'm not 100% clear of your explentaion.
> As Nick has said, just having something like a tagged sub-interface
> between you and your provider where the xconnect terminates would be a
> better idea, the L3 VPNs can be in other sub-int's.
> Cheers,
> James.
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