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

[Mark Tinka]

On 2/11/24 12:10, james list via juniper-nsp 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 ?

You don't say if these are eBGP or iBGP sessions. But assuming the 
latter, do the logs show a corresponding IGP outage?

Mark.