Fabric Upgrade

[CA1107701]

we are upgrading our fabric switches to 2.6.2c for our 2800s and our 3800s to 3.2.0a and we are getting fabric events that relate to BF (Build Fabric) after a newly upgraded switch comes back online. We are currently at 3.1.3a for the 3800s and at 2.6.2b for the 2800s. It takes up to a couple of hours for the events to subside. We have 11 switches on two fabrics - with about 60 servers. all fabric switches generate these events. I am wondering if anyone else has run into this issue and if so, was there a resolution so the ISLs generating the BF messages? here are some of the actual captions.

Fabric_B_SW20 1610 Jul 11 2005 13:06:43 1 4 FABRIC-DOMAIN_INFO Domain 20
Fabric_B_SW20 1609 Jul 11 2005 13:06:32 1 4 FABRIC-SWITCH_ROLE Subordinate switch
Fabric_B_SW20 1608 Jul 11 2005 13:06:27 1 4 FABRIC-RECONFIG Reconfiguration due to BF received (port 14 - Mon Jul 11 13:06:26 2005)
Fabric_B_SW20 1607 Jul 11 2005 13:06:16 1 4 FABRIC-SWITCH_ROLE Subordinate switch
Fabric_B_SW20 1606 Jul 11 2005 13:06:11 1 4 FABRIC-RECONFIG Reconfiguration due to BF received (port 14 - Mon Jul 11 13:06:10 2005)
Fabric_B_SW20 1605 Jul 11 2005 13:06:00 1 4 FABRIC-SWITCH_ROLE Subordinate switch
Fabric_B_SW20 1604 Jul 11 2005 13:05:55 1 4 FABRIC-RECONFIG Reconfiguration due to BF received (port 14 - Mon Jul 11 13:05:55 2005)
Fabric_B_SW20 1603 Jul 11 2005 13:05:45 1 4 FABRIC-SWITCH_ROLE Subordinate switch