Reading another great post of Ivan Pepelnjak from blog.ioshints.info, I followed a link to Cisco website with an article about Unicast Flooding in Switched Campus networks. When I looked at "Cause 1: Asymmetric Routing" diagram, I came to conclusion, that the packets won't be flooded, as it said there in article, because at the reverse route, S1 will reply with its own mac-address to RouterB ARP-request, so switchB will have it in its CAM table, so it will forward the packet to the proper interface toward SwitchA.
What do you think? Am I wrong?
Link, again.
P.S. I even lab'ed it. No unknown unicast happened.
UPD.: I came to yet another conclusion: the situation described above can be true, if entry in the switch's CAM table is timed-out. If the router still has the mac-address of S1, then it will send the packets without subsequent arp-requests, however the switch will now flood the unicast frames.
Showing posts with label Question. Show all posts
Showing posts with label Question. Show all posts
Thursday, August 23, 2012
Subscribe to:
Posts (Atom)