[FROG] IS-IS Complains When Loopback Interface is in Play - Update!

[Mark Tinka]

Just an update, turns out one has to enable IS-IS on the Loopback
interface in FRR, even if it will be a passive interface.

So the below fixes this issue:

interface lo0
 ip router isis 1
 ipv6 router isis 1
 isis passive

Now just to fix authentication, and I think we are golden :-).

Mark.

On 7/Apr/20 16:40, Mark Tinka wrote:
> Hi all.
>
> When I add my Loopback interface to isisd.conf and restart it, it
> throws the below:
>
> 2020/04/07 14:35:44 errors: ISIS: libyang: Missing required element
> "area-tag" in "isis".
> (/frr-interface:lib/interface[name='lo0'][vrf='default']/frr-isisd:isis)
> 2020/04/07 14:35:44 warnings: ISIS: [EC 100663337]
> nb_candidate_commit_prepare: failed to validate candidate configuration
> % Configuration failed: validation error.
>
> A bit of Googling indicated that "router isis 1" would need to come
> first in the configuration, since some previous versions of FRR
> processed the files line by line, and not atomically. But even after
> doing that, I still get the same error; but get this, ONLY when I add
> "interface lo0" to the configuration. Without that, and with just the
> physical interface in the configuration, IS-IS starts up fine.
>
> Any thoughts?
>
> System FRR 7.3 on FreeBSD-12.1. Thanks.
>
> Mark.

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