[c-nsp] Stange issue on 100 Gbs interconnection Juniper - Cisco

[nivalMcNd d]

Can it be DC1 is connecting links over an intermediary patch panel and you
face fibre disturbance? That may be eliminated if your interfaces on DC1
links do not go down

On Sun, Feb 11, 2024, 21:16 Igor Sukhomlinov via cisco-nsp <
cisco-nsp at puck.nether.net> wrote:

> Hi James,
>
> Do you happen to run the same software on all nexuses and all MXes?
> Do the DC1 and DC2 bgp session exchange the same amount of routing updates
> across the links?
>
>
> On Sun, Feb 11, 2024, 21:09 james list via cisco-nsp <
> cisco-nsp at puck.nether.net> wrote:
>
> > Dear experts
> > we have a couple of BGP peers over a 100 Gbs interconnection between
> > Juniper (MX10003) and Cisco (Nexus N9K-C9364C) in two different
> datacenters
> > like this:
> >
> > DC1
> > MX1 -- bgp -- NEXUS1
> > MX2 -- bgp -- NEXUS2
> >
> > DC2
> > MX3 -- bgp -- NEXUS3
> > MX4 -- bgp -- NEXUS4
> >
> > The issue we see is that sporadically (ie every 1 to 3 days) we notice
> BGP
> > flaps only in DC1 on both interconnections (not at the same time), there
> is
> > still no traffic since once noticed the flaps we have blocked deploy on
> > production.
> >
> > We've already changed SPF (we moved the ones from DC2 to DC1 and
> viceversa)
> > and cables on both the interconnetion at DC1 without any solution.
> >
> > SFP we use in both DCs:
> >
> > Juniper - QSFP-100G-SR4-T2
> > Cisco - QSFP-100G-SR4
> >
> > over MPO cable OM4.
> >
> > Distance is DC1 70 mt and DC2 80 mt, hence is less where we see the
> issue.
> >
> > Any idea or suggestion what to check or to do ?
> >
> > Thanks in advance
> > Cheers
> > James
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> >
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