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

[james list]

DC technicians states cable are the same in both DCs and direct, no patch
panel

Cheers

Il giorno dom 11 feb 2024 alle ore 11:20 nivalMcNd d <nivalmcnd at gmail.com>
ha scritto:

> 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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