On 14/07/2009, at 11:26 PM, Jon Lewis wrote:
But isn't that the whole point of MST? Most of what I've read about it talks about doing setups where you only have 2 or 3 instances, with all your vlans in the 2nd and or 3rd instance.
Yup. In a DC / Hosting environment it's a must. Particularly if you have large VMWare type clusters where there can be 100's of unique vlans that need to be presented to all cluster nodes. Can't do that with any form of Per Vlan STP on top-of-rack or blade-chassis switches. In a classic "dual attached L2 access layer" there are only 2 possible paths so 2 MST instances does the job. Having more STP instances than paths to the root bridge adds no value at all.
David ... _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
