From: Brian (signal@xxxxxxxxxx)
Date: Fri Feb 01 2002 - 16:48:28 GMT-3
On Fri, 1 Feb 2002, SEAN wrote:
> Can anyone recommend a good reference to how spanning tree chooses which
> ports to go up to the root bridge?
LAN Switching by CiscoPress, or Buildiing Multilayer Switched Networks by
CiscoPress.
>
> Basically, I have the following set up - two catalyst 5500 switches with
> two trunks between them:
> Switch A port 1/1 to Switch B port 1/1
> Switch A port 2/1 to Switch B port 2/1
>
> Seems the switch always wants to use 1/1 as the spanning tree root
> (unless it's not available). If 1/1 is disabled, and 2/1 is forwarding
> fine, and I reenable 1/1, spanning tree recalculates, and 1/1 becomes
> forwarding again.
>
> These are supervisor III's, and I was thinking that it probably wants to
> use the ports with the lowest mac address? But if I do show mod, both
> supervisor modules show the same mac address range.
>
> Can anyone recommend a good resource on how spanning tree chooses ports?
>
> ------------------------------------------------------------------------
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