From: MADMAN (dmadlan@xxxxxxxxx)
Date: Wed Mar 20 2002 - 17:25:31 GMT-3
Yes I can see that happening and I think that is what Jeff was alluding
to in his response. I also got a response from a guy who works in our
Internet group that mentioned this same thing has happended here!!
This is why I mentioned keep everything off VLAN 1, interface SC0
inclusive and create an administrative VLAN.
Dave
Huy Luu wrote:
>
> .I'm not sure of the answer. I would delete it just because many people
> put sc0 interface to vlan 1, which is the default. I recalled from some
> Cisco text on Switching,when all trunk ports trunk vlan 1 and you end up
> having a vlan that spans the network passing both administrative traffic
> and management traffic. If there was a broadcast storm on Vlan 1, you will
> kill the switch CPU because the CPU process all broadcast and multicast on
> this VLAN. If a broadcast storm was on a different vlan, the asics shiels
> the CPU from processing broadcast and multicast. I always remove it from
> a trunk port in practice.
>
>
> MADMAN
> <dmadlan@qwest To: Huy Luu <hluu@veroxity.com>
> .com> cc: steven.j.nelson@bt.com, ccie
lab@groupstudy.com,
> JA_WRIGHT@admworld.com, nobody@grou
pstudy.com
> 03/20/02 01:42 Subject: Re: Default vlan
> PM
> Please respond
> to dmadlan
>
>
>
> You bring up an interesting point that I haven't found an explanation
> for.
>
> Yes you can delete VLAN 1 from a trunk but you don't have to even if
> you choose another VLAN for the native VLAN. Like you say, even if you
> do delete VLAN 1 it's still hummin in the background taking care of some
> administrative functions.
>
> Therein lies my question. Why the hell would you ever delete VLAN 1
> anyway. Don't use VLAN 1 for anything, ignore it and let it do it
> administrative duties and life is good.
>
> Dave
>
> Huy Luu wrote:
> >
> > You can clear vlan 1 from a trunk. Use the command clear trunk XXX. I
> > believethis is avalable on Catalyst OS version 5.1 or later.This will
> make
> > Vlan 1 a reserve vlan for VTP and EtherChannel negotiation frames. But
> it
> > won't show up in the config. Then you can set your native vlan on the
> > trunk ports to a different vlan number.
> >
> >
> > steven.j.nelso
> > n@bt.com To: dmadlan@qwest.com,
> JA_WRIGHT@admworld.com
> > Sent by: cc: ccielab@groupstudy.com
> > nobody@groupst Subject: RE: Default vlan
> > udy.com
> >
> >
> > 03/20/02 11:39
> > AM
> > Please respond
> > to
> > steven.j.nelso
> > n
> >
> >
> >
> > You can't or shouldn't disable VLAN 1
> >
> > VLAN 1 is the management VLAN that vtp uses to carry the VTP domain
> > information around the trunks.
> >
> > Ta
> >
> > Steve
> >
> > -----Original Message-----
> > From: MADMAN [mailto:dmadlan@qwest.com]
> > Sent: 20 March 2002 16:17
> > To: Wright, Jeremy
> > Cc: 'ccielab@groupstudy.com'
> > Subject: Re: Default vlan
> >
> > How do you disable VLAN 1 except on a trunk?
> >
> > C6509> (enable) clear vlan 1
> > VLAN number must be in the range 2..1000,1025..4094.
> > C6509> (enable)
> >
> > Dave
> >
> > "Wright, Jeremy" wrote:
> > >
> > > if i disable the default vlan and create vlan 6 and vlan 7 (no ports
> > defined
> > > to any vlan)...if i plug into the switch, what vlan will i come up in?
> > >
> > >
> > >
> > >
> > > ************************
> > > Jeremy Wright
> > > Network Analyst
> > > Archer Daniels Midland
> > > ja_wright@admworld.com
> > > (217)451-4063
> > >
> > > ************************
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