[c-nsp] STP over Port-channel issue

james list jameslist72 at gmail.com
Mon May 6 12:04:07 EDT 2024

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


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

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