Question about turning off spanning.
We have a dual core (2 6513's) and are running layer 3 to top of rack switches (3560E's). In each rack there are 2 3560E's. 3560E#1 connects to 6513#1, and 3560E#2 connects to 6513#2. Both 3560E's are connected to each other for redundancy in case one of the links to the 6513's goes down, this link is a L2 trunk link. All connections are 1GB fiber. Is it safe to turn off PVST on both 3560E switches? Will this help with failover convergence?
Even by turning off PVST in your switches I highly doubt you would any see any faster convergence than the one ping drop you were seeing with STP enabled. Are you using the lowest value for HSRP hello and hold timers, which is 1 and 2 seconds. I assume you have setup HSRP to track the L3 interfaces. STP apparently isn't introducing any delay in your network and that's the reason why aren't seeing much delay in reconvergence. Hence, turning off PVST mightn't produce any more favorable outcome as far as reconvergence goes.