IS-IS on FRR - Is Anyone Running It?

Mark Tinka mark.tinka at seacom.mu
Mon Apr 6 10:12:34 UTC 2020


On 6/Apr/20 12:00, Saku Ytti wrote:

> Aah found it, it does do Cisco hack.
>
> https://github.com/FRRouting/frr/blob/58980443821edf95719984e01f31720bd1dc7f79/isisd/isis_constants.h#L172-L180
>
> But as long as you don't pad, your PDU shouldn't exceed 1500B.

Good man, you gave me an idea.

Ran through the documentation and found out how to deal with Hello
Padding in FRR:

interface em0
 ip router isis 1
 ipv6 router isis 1
 no isis hello padding

Looks like IS-IS now initializes:

2020/04/06 10:09:21 ISIS: Opened BPF device /dev/bpf0
2020/04/06 10:09:21 ISIS: BPF buffer len = 4096
2020/04/06 10:09:21 ISIS: failed to set BPF buffer len (4096 to 9000)
2020/04/06 10:09:21 ISIS: circuit already connected
2020/04/06 10:09:21 ISIS: circuit already connected
2020/04/06 10:09:21 ISIS: circuit already connected

Let me continue with the configuration and report back.

Mark.



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