I have a data center LAN with two Hybrid mode 6509's with MSFC's at the core\nand a series of 2950 T switches set up as access layer switches. The 2950's\nhave links back to both of the 6509's. I have uplinkfast configured on all\nof the 2950's. When I did maintenance on the 6509's and took down the\nprimary switch, which is root bridge for all VLAN's the The other 6509\nconfigured as backup root bridge for all VLANS took over and I lost only a\ncouple of pings. When I brought the primary switch back up after the\nmaintenance was complete it appears that the 2950's started forwarding on\nthe primary link and blocked the backup link before the primary switch had\nstarted to forward on any ports. The result of this behavior was that I had\na 90 second outage rather than the 10 to 30 second outage I anticipated. Is\nthere any work around for this?\nthanks for any insight you all might have on this.