HP A7533A - Brocade 4Gb SAN Switch Base Release Note page 28

Upgrades from Fabric OS 6.3 to future releases will be nondisruptive to data traffic and will have
behavior similar to a CP failover; ethsw remains unchanged.
Downgrade from Fabric OS 6.3 to 6.1.2_cee1 is disruptive if ethsw is enabled on Fabric OS
6.3.
Downgrade from Fabric OS 6.3 to 6.1.2_cee1 is nondisruptive if ethsw has never been enabled
with Fabric OS 6.3.
Connecting a 2408 FCoE Converged Network Switch to an FCR-capable switch with fcrbcast
config enabled will cause a storm of broadcast traffic, resulting in termination of iswitchd.
When rebooting a DC SAN director or DC04 SAN director with DC SAN 10/24 FCoE blade,
Qlogic CNA and LSAN zoning, the switch becomes unresponsive for a period of time. This is due
to the CNA sending excessive MS queries to the switch.
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