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Purple

vlan trunking

We have a client server setup with multiple vlans trunked across the uplinks .

We manually pruned all unused vlans off the trunk at the distibution layer and if you look at the distribution layer it will say like only 2 vlans allowed on trunk . My question is how come the access layer switches still say all vlans are allowed on the trunk , I thought the server propagated all trunk info down to the access layer it would read the same thing but it doesn't , it still says all vlan 1-1005 are allowed .

Explanation ????

3 REPLIES
Silver

Re: vlan trunking

VTP does not propogate pruning information only VLANs. If you care to prune on your access switches you will need to manually prune on each trunk.

Hope this helps you,

Don

New Member

Re: vlan trunking

You also have the option of enabling VTP pruning at the VTP server, which has the same effects that pruning manually does, except it is easier on network administrators, because it enables VTP pruning for the entire VTP domain (scales well for larger networks.) Hope this helps..

- Matt

Re: vlan trunking

But the pruned out VLANs are still allowed on the trunk.

If you want to disable VLANx on the trunk you have to do it manually on each trunk (and on each side) by

conf t

int ..

switchport trunk allowed vlan rem x

on an IOS switch

or by

clear trunk mod/port x

on a CatOS switch.

Regards,

Milan

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