From: kurt (kurt@cybernex.net)
Date: Tue Oct 14 2003 - 16:46:32 GMT-3
6509 in the core
3550 switches
all links are gb ...
the channel is 2gb
half of the vlans are c1 primary the other half c2 primary for
load-balancing.
in all cases the opposite core is secondary.
----- Original Message -----
From: "Ram Shummoogum" <rshummoo@ca.ibm.com>
To: <kurt@cybernex.net>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, October 14, 2003 3:41 PM
Subject: Re: spanning-tree question
> The cost variable will certainly play a big role in this. If the channel
> between the 2 core switches is gig, then the root port of S2 will be
> pointing to C2.
> One of the ports between S1 and S2 will be in blocking ( this will depend
> on which one is selected as the DP). If S1 has a lower BridgeID than S2,
> then the port on S2 facing S1 will be blocking.
>
> Therefore, your traffic will be flowing like that: S2-C2-C1
>
>
>
>
>
>
>
>
> "kurt" <kurt@cybernex.net>@groupstudy.com on 10/14/2003 03:17:32 PM
>
> Please respond to "kurt" <kurt@cybernex.net>
>
> Sent by: nobody@groupstudy.com
>
>
> To: <ccielab@groupstudy.com>
> cc:
> Subject: spanning-tree question
>
>
> hi all,
>
>
> topology
>
> core1 --- channel to c2
> link
> switch1
> link
> switch2
> link
> core2 --- channel to c1
>
>
>
> suppose i take two switches, each with a trunk to 1 core switch and a link
> between them.
> the vlan's spanning-trees are tuned as primary and secondary on each core.
> there is also an etherchannel between the 2 core's
>
> suppose a host on switch2 needs to send a frame to a vlan tuned for
primary
> on
> core1.
> and the opposite as well.
>
> traffic should follow the link between the 2 switches right?
>
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