[c-nsp] STP over Port-channel issue

[james list]

Thanks
good point on LACP Fast, we'll test it.
RSTP should be in any case slower than 3 seconds with LACP FAST.

Cheers
James



Il giorno lun 6 mag 2024 alle ore 15:22 Saku Ytti <saku at ytti.fi> ha scritto:

> On Mon, 6 May 2024 at 15:53, james list via cisco-nsp
> <cisco-nsp at puck.nether.net> wrote:
>
> > The question: since the PO remains up, why we see this behaviour ?
> > are BDPU sent just over one link (ie the higher interfac e) ?
>
> Correct.
>
> > how can we solve this issue keeping this scenario ?
> > moving to RSTP could solve ?
>
> No.
>
> I understand you want topology to remain intact, as long as there is
> at least 1 member up, but I'm not sure we can guarantee that. I think
> if you set LACP to fast, it'll fail in max 3s, and you ensure STP
> fails slower (i.e. don't use rapid pvst), you probably will just see
> BPDU switch physical interface, instead of STP convergence.
>
> You'd need something similar to microBFD on LAGs, where BFD PDU is
> sent on each member, instead of an unspecified single member, but
> afaik this does not exist.
>
> So what you really need is L3/MPLS topology :/.
>
> --
>   ++ytti
>