From: Gustavo Novais (gustavo.novais@novabase.pt)
Date: Thu May 24 2007 - 10:25:12 ART
Hello,
Lately I faced a doubt while on a customer audit, that although does not
affect performance, has left me thinking...
You have two switches (lets say 3550 and 2950) in VTP mode transparent,
interconnected through a dot1q trunk, without any vlan filtering on the
trunk ports, but both switches have different vlan databases. Some vlans
in common, some not.
What will happen to the flooded traffic on those trunk ports on the
not-in-common (nic) vlans?
Sh interface trunk tells me that not-in-common vlans are STP forwarding
and are obviously allowed on the trunk.
Will the flooded traffic for one of those vlans cross the patch cable
(tagged), and be dropped by the other switch, who doesn't know that vlan
ID?
Or will it simply not be forwarded over that particular link?
Or will it be flooded through the trunks native vlan (on the receiving
switch)?
Any ideas/comments/links pointing to info are helpful.
Thanks
Gustavo Novais
#15622
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