From: Fabrice Bobes (study@6colabs.com)
Date: Sat Oct 19 2002 - 20:46:17 GMT-3
This VTP thread is getting more interesting.
Yes, the VTP messages are sent to destination mac 01-00-0c-cc-cc ... but
they are only carried over VLAN1. It's not antinomic. The Trunk
encapsulation doesn't matter.
Fabrice
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jay
Sent: Saturday, October 19, 2002 4:05 PM
To: Fabrice Bobes; 'enginedrive2002'; ccielab@groupstudy.com
Subject: Re: VTP domain.
But..how is this possible...if you shut vlan 1 down and use another vlan
as your native vlan...assuming you are talking about the 3550. VTP
messages are sent either as ISL or dot1q frames across the Trunk to
destination mac 01-00-0c-cc-cc-cc . The client switch listens for vtp
messages sent to this mac address and this is how they learn what
domain, vlans they need and configure themselves.
-Jay
----- Original Message -----
From: "Fabrice Bobes" <study@6colabs.com>
To: "'enginedrive2002'" <enginedrive2002@yahoo.ca>;
<ccielab@groupstudy.com>
Sent: Saturday, October 19, 2002 2:54 PM
Subject: RE: VTP domain.
> 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 prove otherwise!
> >
> >
> > The initial question is: Is the command "vtp domain" a must on a vtp
> > client? My answer is you don't need it but you can enter it. You
> > will learn the vtp domain name via the trunk.
> >
> > SLD> I'll save the debate here, until I can complete testing...
> >
> > If you enter the vtp domain on a vtp client you add some kind of
> > security since the vtp advertisements will be ignored if the vtp
> > domain mismatch.
> >
> > SLD> Well, I wouldn't call it a security mechanism, although you're
> > right about the vtp adverts in the case of a vtp mismatch.
> >
> >
> > Stefan
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of Stefan L. Dozier
> > Sent: Saturday, October 19, 2002 9:22 AM
> > To: enginedrive2002; ccielab@groupstudy.com
> > Subject: RE: VTP domain.
> >
> >
> > Yes!
> >
> > I don't know of any other way to tell the "vtp client" the domain
> > name
>
> > of your "vtp server" unless you issue the command "vtp domain
> > <domain
> > name> on the vtp client. It's not automagically transmitted via vtp
> > advertisements if that's your line of thinking!
> >
> > caveat...
> >
> > "This assumes that you have 2 switches, one a vtp server and the
> > other
>
> > a vtp client, and you want both switches in the same vtp domain"
> >
> > HTH
> >
> > Stefan
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf
> > Of
>
> > enginedrive2002
> > Sent: Saturday, October 19, 2002 11:43 AM
> > To: ccielab@groupstudy.com
> > Subject: VTP domain.
> >
> >
> > Is the command "vtp domain <domain name>" a must on a VTP client
> > when I already have VTP server configured?
> >
> > Thank you!
> >
> >
> > E.D.
>
> ______________________________________________________________________
> Post your free ad now! http://personals.yahoo.ca
This archive was generated by hypermail 2.1.4 : Tue Nov 05 2002 - 08:35:51 GMT-3