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We have changed our WiFi environment from Juniper routers to Arista routers. We have had our WiFi on the Juniper routers for 6 years. We have 8 controllers 4 in one building and 4 in another building. The night we made our change to Arista routers the building 1 side worked great, the other building 2 had issues which caused the entire network to see slowness and random drops with non connectivity. If we shut off building 2 the network was stable, when introducing building 2 the network would break. We appreciate all the hard work both parties gave us.īelow are the notes from Aruba and Arista on what the issue was:įlow for forward direction : Client (AP) -> Alden/CSC leafs (building aggregation pod) -> core -> Alden/CSC wireless (7280SRs) -> Aruba Alden/CSC controllers -> Alden/CSC wireless -> core (internet) We had Aruba engineer (Subramanian, Vasudeva) and Arista engineers working seamless together in resolving this issue.

Problem Description : Shortly after replacing Junipers as connection switches to the Aruba WAP Controller Clusters, large ping loss and wireless performance issues were noted. This broken state started around 3:00 PM EST on 9/26. Performance issues and packet loss ended when the controllers were no longer acting as a cluster. > We took a couple of packet captures to understand what kind of traffic was hitting the controller that was causing their CPU utilization to spike - A TX capture on Po101 of the CSC-wireless router (connected to the.

201 controller), capture on SVI 2700/2710 of both CSC/Alden wireless switches. We filtered out ARP, IGMP, DHCP and MDNS - We did not find any significantly heavy broadcast/multicast flows. > Aruba enabled an optimization on the controllers that would discard broadcasts/multicasts besides ARP, DHCP and MDNS. This indeed brought down the CPU utilization on the controllers. This optimization was enabled for client VLANs 2700/2710, as traffic on both these VLANs seemed to be causing the high CPU utilization on the controller. Aruba identified that some client flows that were to be seen only on the Alden controllers of the cluster were visible on the CSC controllers.

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