IS-IS on FRR - Is Anyone Running It?

Fri Apr 3 07:31:40 UTC 2020

Hi all.

So I finally decided to start messing around with FRR for a native IS-IS
deployment for some of our FreeBSD-based Anycast services.

I hit an issue that I posted to the FRR list that hasn't progressed
beyond identifying a bug:

2020/03/21 03:12:36 ISIS: isis_send_pdu_bcast: sock_buff size 8192 is
less than output pdu size 9014 on circuit em0
2020/03/21 03:12:36 ISIS: [EC 67108865] ISIS-Adj (1): Send L2 IIH on em0
failed

This is being addressed here:

    https://github.com/FRRouting/frr/pull/6066

But my main question was if there was a command or setting in zebra.conf
and/or isisd.conf that I can use to define the MTU IS-IS should use to
set itself up, rather than being informed by what the interface
currently runs at. I've tried everything that is documented as well as
stuff that isn't, but nothing is accepted or recognized.

Either no one runs IS-IS on FRR, or much of the implementation is still
being developed and/or hasn't been tested in the wild, i.e., no traction.

I'm hoping there is someone on this list that has played with IS-IS on
FRR to point me in the right direction.

The setup is FRR 7.3 on FreeBSD-12.1. Thanks.

Mark.
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