Tuesday, September 7, 2021

Arista 7280 FlexRoute BGP Route Withdrawal Issue

Hey Folks,

I wanted to see if anyone has seen the behavior I'm currently seeing with my 7280 Internet Routing POC.

Topology Overview:

(2) Tier 1 ISP's, 10G Circuits

(2) 7280R2-48YC6-F, 100G iBGP Peering between

Enterprise edge is a unique public AS, we have an eBGP peering with each carrier, Full table + Default Peering profile. Between the two 7280's we have an iBGP Peering.

The Issue:

When I do failover testing its taking upwards of 3 - 3.5 minutes for the routes to withdraw from the iBGP connection between the 7280's. I will fail one of the circuits (hard down L1 in this instance), and you can see the iBGP peering slowly withdraw the routes on the 7280 with the active circuits. From the end user standpoint traffic is getting black holed if the failed circuit was the preferred path over the iBGP peering link.

For reference this topology is normally Cisco ASR-1001HX and it takes less than 30 seconds for the iBGP peering to withdraw the routes of the failed peer. We've been working with Arista TAC and they are saying this is expected and they have no one else who has seen this issue.

The internet topology itself is pretty standard and is used by enterprises all over, so I was looking to see if anyone has seen this in their travels or testing when using these in this topology.



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