From: Sadiq Yakasai (sadiqtanko@gmail.com)
Date: Sun Jun 22 2008 - 09:04:45 ART
Hey Ananth,
A Cisco IP phone will always send tagged traffic on the Voice VLAN if one is
configured and hence it should not be seen on the Access VLAN, thats why I
think its a tricky one.
But a quick question for "Itsfortarget", is the IP phone is Cisco or any
other vendor phone? I think that could explain why you are seeing this.
Cisco phone would tag their frames right from start using the Voice VLAN
(42) that they have learnt via CDP. Third party phones on the other hand,
have a slightly different way to learn about the Voice VLAN and hence, could
start sending untagged frames on the access VLAN (102) and then eventually
move to the Voice VLAN to beging tagging frames. Hence we could see their
MAC address appear on both VLANs (before it ages out, naturally).
Lets see what he comes back with though.
Sadiq
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