From: Weidong Xiao (Weidong.Xiao@vi.net)
Date: Fri Sep 27 2002 - 09:24:37 GMT-3
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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