What is the command to enable MAC address reduction on the 6500, or is it done when you enable extended system-id? It doesn''t appear to be in any Cisco docs for IOS switches; the CatOS command is "set spantree macreduction enable."
see Comparison of the Cisco Catalyst and Cisco IOS Operating Systems for the Cisco Catalyst 6500 Series Switch
Because the Cisco Catalyst OS and Cisco IOS Software support the creation of 4094 Layer 2 VLANs, a MAC-address reduction feature must be enabled so that the system can allocate a limited number of system MAC addresses more efficiently. The following commands enable this feature: Cisco Catalyst OS Cisco IOS Software set spantree macreduction enable IOS(config)# spanning- tree extend system-id
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