From: Bob Rech (brech@kc.rr.com)
Date: Tue Oct 01 2002 - 10:08:16 GMT-3
I just tried the following:
SW1{5000} vtp domain TEST Server trunked to SW2{2924} vtp domain TEST2
Transparent trunked to
SW3{1924}vtp domain TEST Client.
VTP adv from SW1 do Not get propagated through SW2 unles it is in the same
vtp domain even in Transparent mode.
----- Original Message -----
From: "Weidong Xiao" <Weidong.Xiao@vi.net>
To: "Chuck Church" <cchurch@MAGNACOM.com>
Cc: "Lyndon Guo" <lyndon@vip.sina.com>; <ccielab@groupstudy.com>; "Phil"
<ciscostudent1@yahoo.com.br>; "Bob Rech" <brech@kc.rr.com>; "Ahamed Maideen"
<asadayan@cisco.com>
Sent: Friday, September 27, 2002 11:44 AM
Subject: RE: VTP
> Thanks for your reply.
>
> I wish that I could have contral on Switch 11 and 12. In fact they are not
our CPE.
> If the VTP stuff can't work the way as I said, we have to pay an arm and
leg for a inter-floor link, or set up 2 vtp domains, involving network
changing...
>
> I heard from my colleague from his friend's friend that it might work. I
think the best way to verify it is to do an experiment.
>
> Does someone have spare switches and could be kindly do a test?
>
> Cheers,
> Weidong
>
>
>
> > -----Original Message-----
> > From: Chuck Church [mailto:cchurch@MAGNACOM.com]
> > Sent: 27 September 2002 15:46
> > To: Weidong Xiao; 'Phil'; 'Bob Rech'; 'Ahamed Maideen'; 'Lyndon Guo'
> > Cc: 'ccielab@groupstudy.com'
> > Subject: RE: VTP
> >
> >
> > Why not just leave all connections as trunks, and make
> > switches 11 and 22
> > VTP transparent? That way they'll forward the VTP
> > advertisements unchanged.
> > I'm assuming from the drawing that 11 and 22 are both in domain 2. If
> > either 11 or 22 need to be a client or server, I don't think
> > it'll ever
> > work. VTP is a special kind of packet, like CDP. A Cisco
> > device won't just
> > switch/route it like a normal frame/packet. They get send to
> > the CPU. If a
> > VTP advertisement's domain doesn't match your domain, it's
> > ignored and not
> > forwarded.
> >
> > Chuck Church
> > CCIE #8776, MCNE, MCSE
> > Sr. Network Engineer
> > Magnacom Technologies
> > 140 N. Rt. 303
> > Valley Cottage, NY 10989
> > 845-267-4000
> >
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Weidong Xiao
> > Sent: Friday, September 27, 2002 8:25 AM
> > To: Phil; Bob Rech; Ahamed Maideen; Lyndon Guo
> > Cc: ccielab@groupstudy.com
> > Subject: RE: VTP
> >
> >
> > Thanks you all for your reply, but I still think there may be
> > a chance for
> > it to work.
> >
> > Say, SW1 send a frame to Sw11, ISL encapsulated. The
> > beginning of this frame
> > is a 26 bytes ISL header, and the beginning of this ISL header is
> > destination address field. This address is a multicast
> > address and is set
> > at "0x01-00-0C-00-00" or "0x03-00-0c-00-00". The next field
> > in ISL header is
> > Type Field, for ethernet, it's always 0000. So, from Sw11
> > (vlan8 port)point
> > of view , the first 48 bits of the frame it received is
> > "0x01-00-0C-00-00-00" or "0x03-00-0c-00-00-00". This is a
> > multicast mac
> > address, if the Sw11 port is doing cut-through switching (or whatever
> > switching), the port should flood it all over vlan8, so the
> > frame should be
> > able to arrive SW2.
> >
> > Does this make sense?
> >
> > Thank you very much,
> > Weidong
> >
> > p.s.
> > URL about isl encapsulation frame format:
> > http://www.cisco.com/warp/public/473/741_4.html
> >
> >
> >
> >
> > > -----Original Message-----
> > > From: Phil [mailto:ciscostudent1@yahoo.com.br]
> > > Sent: 26 September 2002 17:31
> > > To: Weidong Xiao; ccielab@groupstudy.com
> > > Subject: Re: VTP
> > >
> > >
> > > I don't believe it's gonna work. VTP, as the name states
> > > (Vlan Trunk Protocol) is supposed to run on trunks.
> > >
> > > Weidong Xiao <Weidong.Xiao@vi.net> escreveu: Hello,
> > >
> > > SW1----------------Sw11--Sw22-----------SW2
> > > (domain1,server) (domain2) (domain1,client)
> > >
> > > I have four switches belonging to 2 domains, topoly is as
> > > above. Is it possible for vlan information propagate from SW1
> > > to SW2? If I create a vlan (say,vlan8)in domain2, can I deem
> > > vlan8 just as a wire, and it should transport vtp info?
> > >
> > > Cheers,
> > > Weidong
> > >
> > >
> > > ---------------------------------
> > > Yahoo! GeoCities
> > > Tudo para criar o seu site: ferramentas faceis de usar,
> > > espago de sobra e acesssrios.
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