HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual page 191

Message
Cannot downgrade due to the presence of broadcast zone(s). Remove or disable them before proceeding.
Probable cause and recommended action
If the switch is running v5.3.0, and a "broadcast zone" is configured, the user will not be allowed to
downgrade the switch to v5.2.0 or earlier, as a broadcast zone gets a special meaning in v5.3.0 but it will
be treated as regular zone in v5.2.0 or earlier.
Use the zoneRemove command to remove the zone or zoneDelete command to delete the zone.
Message
Cannot downgrade due to the presence of IPv6 addresses on the switch. Please reconfigure these
addresses before proceeding. (Firmwaredownload will tell the user which addresses are configured with
IPv6 and commands used for remedy).
Probable cause and recommended action
If switch is running v5.3.0, and if there are any IPv6 addresses configured, e.g. switch IP address, syslog IP
addresses, radius server, etc. the user will not be allowed to downgrade to a version that does not support
IPv6.
Use the ipaddrset command to change the IPv6 addresses to IPv4 addresses.
Message
Cannot downgrade due to LSAN count is set to 3000, please disable it before proceeding.
Probable cause and recommended action
If a switch is running v5.3.0 and the LSAN count is at 3000, then you will not be allowed to downgrade to
v5.2.0 or earlier.
Use the fcrlsancount command to disable the LSAN.
Message
Cannot downgrade due to LSAN zone binding is enabled. Please disable it before proceeding.
Probable cause and recommended action
If switch is running v5.3.0, and if LSAN zone binding is enabled, the user will not be allowed to
downgrade to v5.2.0 or earlier.
Use the fcrlsanmatrix command to disable the LSAN.
Message
Cannot downgrade to v5.2.0 or lower due to GE port(s) has MTU size configured between 1261 to 1499
bytes. Please use portcfg command to reconfigure the mtu size and try again.
Probable cause and recommended action
If a GE port has its MTU size configured between 1261 to 1499 bytes, you will not be allowed to
downgrade to v5.2.0 or earlier.
Use the portcfg command to reconfigure the MTU size and try again.
Fabric OS 5.3.0 administrator guide 193