Firewall Wizards: RE: VLAN Security

[Carson Gaspar <carson () taltos org>]

--On Thursday, June 10, 2004 7:41 PM +0300 John Kougoulos 
<koug () intranet gr> wrote:
> > * Never deliver VLAN 1 downstream (switchport trunk allowed vlan remove
> > 1)
> Is this possible? As far as I know you can not remove vlan 1 from a trunk
> at least on a cisco switch. Even if it doesn't appear on the allowed
> vlans, if you put a sniffer you will see traffic from vlan 1 and on show
> spanning-tree you will see it running an STP instance for vlan 1.
I believe this was fixed in recent versions of the switch software (as we 
just disabled VLAN1 after waiting for an OS upgrade), but I'm not a Cisco 
switch jockey...
--
Carson

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