On Fri, Mar 12, 2010 at 2:21 PM, Jay Nakamura <[email protected]> wrote: > We have an Extreme Summit switch where I found that if you have two > separate ports on different VLANs, and the same MAC address enters the > switch on those two completely different VLANs, the switch will start > having problems forwarding traffic. (Or only use the first entry in > the FDB, I am not sure what it actually does other than half of the > traffic drops.) Extreme support has confirmed that this is by design. > > The reason I am posting this here is simple, does Cisco switches do > the same thing? Or if MAC address comes from two ports on different > VLAN, would it just forward per VLAN? Or would it depend on the > model? > > I can think of so many possible problems with this that I want to see > if this is common design of switches or just Extreme and I need to > start using different L2 switches.
I have run into it multiple times on some older (circa 2000) ProCurve equipment. Modern switches should have per-vlan fdb, avoiding this problem. -- Tim:> _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
