From: Larson, Chris (CLarson@usaid.gov)
Date: Tue Oct 08 2002 - 14:53:19 GMT-3
I am not too familiar with the 3550, but wouldn't you on one switch give a
command (this is for 6500 but maybe similiar) along the lines of
set spantree root for each odd vlan on switch 1 and set spantree root
secondary for each even on switch 1 and then the opposite on switch 2. set
spantree root for all even vlans and set spantree root secondary for all
odd.
> -----Original Message-----
> From: Senthil Kumar [SMTP:senthil.kumar@intechnology.co.uk]
> Sent: Tuesday, October 08, 2002 11:21 AM
> To: ccielab@groupstudy.com
> Subject: Gigstack / Gigtrunk
>
> 3550----------gigstack------------3550
>
> as we all know when a switch is enabled for uplink fast. it increases the
> cost of all ports to stay above 3000 to prevent the port becoming a root
> port and we also need to disable vlan prioroty before putting a switch
> into
> uplink fast...right,
>
> assuming you connect two 3550 routers with a gig stack and enable gigstck
> uplink fast - aka cross stack uplink fast.. now all the vlan priorities
> will
> be reset to 0 and all port cost will be set to be more than 3000 . as
> there
> are only two switches one of them needs t0/will become a root for all the
> vlans....
>
> what could you possible do to make switch 1 the root for all odd vlans and
> switch 2 to be root for all even vlans..
>
> isnt this intersting...
>
>
>
> scenario-2
>
> 3550----------gigstack-------------3550
> -----------gig-trunk-----------
>
> assuming you run a gigstack and a trunk bettwen two swithces...how will
> this
> behave?
>
> any ideas
>
> cheers! sen
>
>
>
>
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