From: Fabrice Bobes (study@6colabs.com)
Date: Sun Oct 20 2002 - 00:45:03 GMT-3
Loizos,
I am not an expert on anything, believe me :-)
In our VTP scenario with server and client, we need VLAN1.
If you plan to remove VLAN1 from the trunk, you need to remember that
many control protocols needs it like DTP, CDP, PagP, VTP, ... Actually,
I am reading the Cisco Doc and it says that if you disable VLAN1, the
control protocols still go through. I'll test tomorrow on a pair of
3550.
If you just need to trunk with a router on a stick, you don't necessary
need VLAN1.
A good habit anyway is to allow only the VLANS you need on the trunk.
Fabrice
-----Original Message-----
From: LoizosCisco [mailto:david_steven2001@yahoo.com]
Sent: Saturday, October 19, 2002 8:15 PM
To: Fabrice Bobes; ccielab@groupstudy.com
Subject: RE: VTP domain.
Fabrice,
Thanks for the reply.
What if I am trunking to a router port and I have to
only allow certain vlans to go through? If I specify
the vlans and the 1002-1005 vlans and do not specify
the vlan1 will that be a problem ? OR do I always have
to specify 1002-1005, vlan 1 and the other vlans?
In other words, should I make it a standard to have 1002-1005,1, plus
the other vlans involved in trunking, everytime I have to allow specific
vlans through a trunking port?
I wish I had the two 3550s to practice myself but I do
not. I will appreciate any info. You seem to be the
expert on this 3550 vlan stuff :-)
Thanks again
Loizos
--- Fabrice Bobes <study@6colabs.com> wrote:
> Loizos,
>
> When you configure a trunk, the traffic for all the
> vlans will be
> transported by default.
> You don't need to manually add VLAN1.
> To confirm that VTP needs VLAN1 to transport its
> messages, I have just
> removed Vlan1 from the trunk, created a new VLAN on
> the VTP server and,
> as expected, the new VLAN didn't show up on the vtp
> client.
>
> Fabrice
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> LoizosCisco
> Sent: Saturday, October 19, 2002 5:53 PM
> To: Fabrice Bobes; 'enginedrive2002';
> ccielab@groupstudy.com
> Subject: RE: VTP domain.
>
>
> Fabrice,
>
> When I add vlans to Trunk I know I must add the
> 1002-1005 and the other vlans that are involved in
> trunking. Do I also need to add vlan1 or is it added
> by default?
>
> Loizos
>
>
> --- Fabrice Bobes <study@6colabs.com> wrote:
> > This is correct, VTP is only carried over VLAN1.
> > Obviously, you can't
> > disable VLAN1 from the trunk when using vtp.
> >
> > Fabrice
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com] On Behalf Of
> > enginedrive2002
> > Sent: Saturday, October 19, 2002 2:16 PM
> > To: ccielab@groupstudy.com
> > Subject: Re: VTP domain.
> >
> >
> > Thanks for the confirmation Fabrice and Stefan!
> >
> > I have another question about VTP: which vlan is
> > used to
> > transmit/receive VTP packets? I remember read from somewhere that it
> > only use vlan1, is this true?
> >
> > Thanks!
> >
> >
> > E.D.
> >
> > ----- Original Message -----
> > From: "Stefan L. Dozier" <doziersl@yahoo.com>
> > To: "Fabrice Bobes" <study@6colabs.com>;
> <ccielab@groupstudy.com>
> > Sent: October 19, 2002 3:48 PM
> > Subject: RE: VTP domain.
> >
> >
> > > Ok...I've completed testing and I concur with
> your
> > assessment and your
> >
> > > answer, that "vtp domain <domain name> on a
> > configured client is "not"
> >
> > > a must!
> > >
> > > Given the situation, where the client switch is
> in
> > a default vtp
> > > state, and it's vtp mode has been set to
> "client",
> > you can connect him
> >
> > > to a vtp server via a trunk link, and have him
> > "inherit" the vtp
> > > server's domain name.
> > >
> > > Good catch...I didn't know that, but I do now
> :-)
> > >
> > > Thanks for testing and increasing my level of
> > knowledge! I've always
> > > set the domain name manually as well as ensure
> the
> > client was actually
> >
> > > a vtp client, before connecting them to the
> > network, less you'll
> > > possibly be struggling to bring your network
> back
> > from death due to
> > > erasure of your vtp domain. :-)
> > >
> > > Stefan
> > >
> > >
> > >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com]On Behalf Of
> >
> > > Fabrice Bobes
> > > Sent: Saturday, October 19, 2002 2:39 PM
> > > To: 'Stefan L. Dozier'; ccielab@groupstudy.com
> > > Subject: RE: VTP domain.
> > >
> > >
> > > Stefan,
> > >
> > > I can confirm that a vtp client in a default vtp
> > state will get the
> > > vtp server's domain name via a trunk. I tried
> this
> > on 2 of my
> > > Catalysts 3550 not later than yesterday. No, I
> > wasn't bored.
> > >
> > > Thanks for the comments,
> > >
> > > Fabrice
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com] On Behalf
> > > Of Stefan L. Dozier
> > > Sent: Saturday, October 19, 2002 11:07 AM
> > > To: ccielab@groupstudy.com
> > > Subject: RE: VTP domain.
> > >
> > >
> > > Comments Inline.....
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com]On Behalf Of
> >
> > > Fabrice Bobes
> > > Sent: Saturday, October 19, 2002 1:07 PM
> > > To: 'Stefan L. Dozier'; ccielab@groupstudy.com;
> > > enginedrive2002@yahoo.ca
> > > Subject: RE: VTP domain.
> > >
> > >
> > > OK, you can issue the "vtp domain" command on a
> > switch in the client
> > > mode. But the switch will inherits the domain
> name
> > via the trunk link.
> > >
> > > SLD> Maybe it will, I've never seen it happen,
> but
> > I'll assume until
> > > I can test to be sure, that you're talking
> a
> > switch with default
> > > vtp
> > > parameters, connected via trunk to a vtp
> > server, and changed
> > > to a client, will pickup the vtp server's
> > domain name.
> > > But if the client switch is not a default
> vtp
> > state, i.e.
> > > vtp parameters have been previously
> > configured, and you change
> > > the domain name on the server, that domain
> > name will not
> > propogate
> > > via vtp to the client switch, but will
> result
> > in a vtp mismatch
> > > as noted below.
> > >
> > > A vtp advertisement includes the VTP domain
> name.
> > >
> > > SLD> On this point, I stand corrected, the
> domain
> > name is indeed
> > > included in the vtp advertisement. Which is
> > why I'll entertain
> > > the possibility above, until I can test and
>
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