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6509's for Core switches
Also enable uplinkfast on access switch (trunk) ports, enable portfast on end-device ports ONLY. -
6509's for Core switches
Sounds like you may be experiencing spanning tree (STP) loops / broadcast storm. Are you splitting up user groups / IP subnets into separate vlans (not using default/management vlan 1 for user traffic)? Running VTP (enabled) w/consistent VTP domain name & password on all switches? Set (all)...
