From: Chuck Church (cchurch@MAGNACOM.com)
Date: Fri Sep 27 2002 - 11:45:55 GMT-3
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
>
>
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