ARP/MAC Tables Not Updating on Core Switches After F5 LTM Failover (GARP Issue?)

Same here. I was also sceptical regarding MAC masquerading, but upon experiencing the above mentioned ARP problems in the nexus infrastructure (which were somehow related to fabric-path if I remember correctly), I converted all (60+) traffic-groups on my devices to MAC masquerading and didn't have any bad experiences. We are also connecting to Nexus switches using vpc (albeit N5Ks as spines, being cross-connected via N7Ks as hubs) and we are also using vcmp (on Viprion though, not 5250).