[c-nsp] RSVP-TE (MPLS-TE) and LDP question

[Aaron Gould]

Thanks James for the confirmation as that's precisely what I'm seeing.
Would be nice to see a link to a cisco document or someone out there online
that speaks to this 

-Aaron

-----Original Message-----
From: James Jun [mailto:james at towardex.com] 
Sent: Monday, May 11, 2020 3:26 PM
To: Aaron Gould
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] RSVP-TE (MPLS-TE) and LDP question

On Mon, May 11, 2020 at 01:02:23PM -0500, Aaron Gould wrote:
> Seems that when I try to use RSVP in place of LDP for label distribution,
I
> cannot completely remove mpls ldp configs from IOS XR, but I can from IOS
XE

It's an implementation 'bug' on IOS XR.

If you have L3VPN type service (also affects labeled-ucast, including 6PE),
you *must*
have 'mpls ldp' and router-id configured at minimum, even if you are not
using any LDP
adjacency whatsoever.  I believe ldp process needs to run to allocate labels
for l3vpn,
even if you do not use LDP transport.

So, just leave 'mpls ldp' and router-id configured below it.  As long as you
don't 
have LDP adjacencies defined, and there are no LDP tunnels configured, you
won't have
any LDP in use.

P routers are not affected, as they do not need to allocate labels for VPN
services.


James