After an RSTP topology change, does a device necessarily have to flush both unicast and multicast address tables? I'm running into an issue where my multicast GDAs (which are dynamic) are being flushed, and not being relearned until the next IGMP report comes in, which can be at best several seconds or up to a minute. This is too long. Is there a hard and fast rule that says you *must* flush multicast, or is it only a best practices type suggestion?
Thanks, Dan