You need to enable MAC reduction (extended vlan range) if you want to support all 4096 STP instances on a 6500. I have personally seen over 3000+ STP instances running using PVST+ with MAC reduction enabled. MAC reduction will steal bits from the bridge priority in order create 4096 unique bridge IDs. The CPU load with PVST+ compared with MST is vary dramatic. As long as you stay away from the older 10/100 Ethernet cards PVST/ RPVST should scale fairly well. I have seen PVST+ start to fail when you reach 75,000 virtual ports and MST can easily handle over 100,000 virtual ports.
Clinton.
[email protected] wrote:
regarding maximum STP instances... I believe theres a platform limit of 1024 because of the MAC to VLAN bridge mapping on the platform - but, from the values above, you can see that virtual ports would hit you quite quickly without appropriate control of the VLANs alan _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
-- ================================================================== Clinton Work Airdrie, AB _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
