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

[Igor Sukhomlinov]

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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