[j-nsp] IPv4 BFD flaps on MX204

[Antti Ristimäki]

Hi,

In fact inline IPv6 BFD is supported for other than link-local addresses starting from 18.1 IIRC. This doesn't help for IS-IS or OSPFv3, though, as those use link-local addresses for adjacencies.

We do have IPv6 BFD enabled for IS-IS but with very relaxed timers compared to IPv4. Haven't seen any issues for a couple of years.

Antti

----- On 18 Aug, 2020, at 15:11, Mark Tinka mark.tinka at seacom.com wrote:

> I'd recommend disabling IPv6 BFD for now as well. It's not handled in
> hardware, and so if it drops, you would lose your IGP. Worse if you run
> multiple address families in your IGP, e.g., IS-IS, or IPv4 over OSPFv3 .
> 
> Hardware support for BFDv6 is coming in 1H'21.
> 
> Mark.
> 
> On 18/Aug/20 13:01, Mihai wrote:
>> Hi Ivan,
>>
>> Indeed, that was the issue, thanks!
>>
>> Regards
>>
>> On 18/08/2020 09:54, Ivan Malyarchuk wrote:
>>> If you have many uncontrolled directly connected L2 domains like
>>> IX-es or customers, check policer __default_arp_policer__.
>>> If there are drops, you need to apply interface-specific arp policers
>>> to interfaces with protocols and/or to source of arp bursts.
>>>
>>>
>>>
>>> 18.08.2020 02:35, Mihai пишет:
>>>> Hi,
>>>>
>>>> I have a MX204 with a couple of OSPF/OSPFv3 adj to other MXs over
>>>> two et- interfaces, BFD enabled for both protocols.
>>>> At random intervals the IPv4 BFD sessions are flapping with or
>>>> without the 'no-delegate-processing' option, however the IPv6
>>>> sessions are stable (they are using the same timers).
>>>>
>>>> Did anyone experienced something like this? The router is running
>>>> 18.2R3-S3.
>>>>
>>>>
>>>> Thanks!
>>>> _______________________________________________
>>>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>>>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>>
>>
>> _______________________________________________
>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/juniper-nsp
> 
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp
> 
> 
> --