- The setup has 4 controllers in cluster1. 2 from Alden building and 2 from CSC building.
- The wired environment was migrated to Arista recently.
- When CSC controllers are brought into cluster we saw high datapath utilization with zero clients connected.
- The datapath utilization goes high with various CPU from time to time with 22,23 and 24.
- BWM table get policing on excess ARP traffic for contract ID:9.
- We enabled BCMC optimization on Vlan 2700 and 2710 and found the utilization came to normal.
- We confirmed that there is an excess traffic hitting the CSC controller from Vlan 2700 and 2710.
- We also noticed the client traffic which is destined to Alden UAC controller is seen on CSC controller[ which is the AP anchor].
- Involved Arista TAC and twe found that due to equal cost routing the traffic may land on these controllers.
- Additionally, the uplink switches are designed to do ARP refresh frequently to keep the mac and ARP table intact. This may result in flooding of frames frequently.
- They reduced the ARP timer on the switch to 10 mins and increased the mac timer to 15 mins.
- This reduced the excess flooding and controllers become stable on utilization.
- We implemented the changes on all Vlans. Added CSC controller 2 to cluster and refreshed cluster.
- APs and clients are equally load balanced now.
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