Symptoms:

• The Administration > Management > System Monitor page intermittently shows Failed to load resources and agents are reporting Disconnected in a Cisco ACI based environment.
• vRealize Log Insight VIP is not reachable for ingestion, however ingestion sent directly to a node succeeds.

VMware vRealize Log Insight 8.x
VMware vRealize Log Insight 4.6.x
VMware vRealize Log Insight 4.8.x
VMware vRealize Log Insight 8.1.x
VMware vRealize Log Insight 4.7.x

The L4-L7 Virtual IPs option was introduced in Cisco Application Policy Infrastructure Controller (APIC) Release 1.2(1m).
This option is located at Tenant > Application Profiles > Application EPGs or uSeg EPGs.
This option disables data-plane IP learning for the specific DSR virtual IP address. Failure to disable IP learning for the DSR virtual IP address will result in IP endpoint flapping between different locations in the Cisco ACI fabric.

For more information, see ACI Fabric Endpoint Learning White Paper.

 Note: Ensure that GARP is set to "enabled" for the segment on CISCO ACI. The default GARP setting is "disabled."

After following the above steps, it is necessary to perform a reboot of all nodes in the vRealize Log Insight cluster.

​​​​​​Note: A service restart will not suffice here, a reboot is required.

1. In the vRealize Log Insight UI, note which node has the ILB (Integrated Load Balancer). You will reboot this node last.
2. From the vSphere Web Client, right click the vRealize Log Insight node, select Power > Restart Guest OS
3. Repeat step 2 on the remaining nodes in the cluster, one by one.