From: Huy Luu (hluu@xxxxxxxxxxxx)
Date: Wed Mar 20 2002 - 16:09:38 GMT-3
.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, cciela
b@groupstudy.com,
JA_WRIGHT@admworld.com, nobody@groups
tudy.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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