[c-nsp] MPLS LDP Sync w/ ISIS over point to point Link

[Blake Dunlap]

Are you doing ldp sourced from loopback or something?

-Blake

On Mon, Feb 2, 2015 at 1:26 PM, Troy Boutso <sensible115 at gmail.com> wrote:
> Hey
>
> I've been rolling out new routers to various sites throughout our
> organisation. And in doing so, I've been applying the "mpls ldp sync"
> command under the "router isis" subsection.
> This has been fine up until now. Because all other sites are running OSPF
> and ISIS together (as we are in the process of migrating away from an OSPF
> network to an ISIS based MPLS core network, etc).
>
> With this new site, I only planed on only bringing up the isis adjacency as
> it is a new site and no OSPF is required (because I don't need to migrate
> anything off). However the ISIS adjacency won't come up because it doesn't
> have an LDP session up yet. And the LDP session wont come up without the
> IGP coming up.
>
> This is some real chicken and egg stuff right here.
>
> It has become quiet clear that all my other routers in production which
> have LDP sessions are essentially relying on that OSPF adjacency to help
> form the initial LDP session.
> One day I plan to shut those down. Which could cause me big issues further
> down the road.
> I do have ldp session protection enabled ... but if a router was to reboot
> and have no ospf to help form the initial LDP, then it seems my isis
> adjecencie may never form. That is the worst case scenario
>
>
> Getting back to my point ... If I remove the mpls ldp sync on both routers
> the ISIS adjacency forms immediately. So this is definitely the culprit.
> How on earth is this feature supposed to work in a production environment?
> Am I missing something here?
>
> Am I supposed to manually form ldp sessions (targeted) or something?
> If anyone has experience with this, I'm all ears.
>
> Kind Regards
> Troy
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