I am in the process of building an active/passive cluster which spans two trunked Cisco 6509 switches. The external interfaces are in a common VLAN, and the internal interfaces are in their own VLAN as well. Each VLAN is using HSRP (which the SA6500s are using as their gateway). The issues I am seeing are: 1) If the cluster is set to unicast mode, the two nodes show up as leader and enabled, as expected. However, when testing VIP failover, the failover performance is slow, with users experiencing an outage of 20 - 120 seconds, in some cases losing their network connect access altogether. 2) If the cluster is changed to multicast or broadcast mode, each node shows up as a leader, and failover doesn't work at all. I should mention that there are no ACLs, firewalls, etc. between the nodes. In addition, they are both running v7.0R3. I've tested the same scenario on other code revisions (e.g. 6.5R2), with no change in the behavior. I appreciate any insight that you could provide.
... View more