RE: Significance of 'domain' in VTP

From: Andrew Fort (afort@staff.webcentral.com.au)
Date: Sat Jul 07 2001 - 05:20:22 EDT


>Hi all,
>i would like to know the use and significance of
>domain in vtp and setting of VLANs?
>Regards,
>Vinod

basically, VTP devices will only act upon VTP updates from bridges in the
same domain as their own.

additionally, the device has to be in the correct VTP mode (client or server
to use 'on the wire' updates).

check your switch documentation, it will have a link to the relevant
documentatio regarding VTP implementation on that platform.

on c2900xl/c6sup* it is the "vlan database" commands documentation.

Make sure all your VTP devices you plan to run in client or server mode can
have the same size VTP database, or that you watch your syslogs carefully.
Otherwise, you have 2900XLs that have ~64 spaces in their vlan table and the
cat3500XL/6000 that allow 256 or 1024 or whatever, and when the switch runs
out of space in its table it will switch to transparent mode. It must be
set back to client and a VLAN removed on that switch (effectively requiring
transparent mode) before another can be added.

so if you plan for more than 64 vlans in your idc, try not to use 2900xls,
use 3500xls. or run without vtp. it's not impossible, it just makes some
operations more time consuming and require a little more care.

-amf



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