From: sholy augustine (sholyka@yahoo.com)
Date: Thu Dec 01 2005 - 04:45:06 GMT-3
Hi,
I have some confusion regarding the difference between
ISL and dot1q encapsulation. As to my knowledge ISL
uses only 10bits (although 15 bits is reserved) for
VLAN ID giving total of 1024 VLAN IDs and dot1q uses
12 bits giving a total of 4096 VLANs.
When I configure a trunk between 2 3550 switches, I
don't see any difference between them both in show
outputs and in functionality
For both ISL and dot1q the allowed VLAN on the trunk
is up to 4096. This is an expected behaviour for
dot1q, but for ISL why is it giving 4096, should it
not be 1024 only
Also for ISL encapsulation, native VLAN ID is provided
Kind Regards,
Sholy
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