3Com Switch 7750 Configuration Guide Guide

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Caution
■ Switch Fabric software and I/O Module (line processing unit) software must be
identical. Otherwise Switch 7750 Family Ethernet Switches cannot work
normally.
■ To keep the software of Switch Fabric and I/O Module identical, you need to
restart the I/O Module after you upgrade the host software of the Switch Fabric
of the Switch 7750 Family Ethernet switches.
■ Switch 7758 feature the double Switch Fabrics and active-standby switchover
function. If a switch possesses two Switch Fabrics, with the active-standby
switchover function enabled, you can in turn upgrade and restart the two
Switch Fabrics with one Switch Fabric being active. Although Switch Fabric can
be upgraded through hot backup, because the I/O Module must be restarted
to keep identical with the Switch Fabric’s software, your services will still be
interrupted during the I/O Module restart period. Therefore, you are
recommended to restart the whole switch straight after you upgrade the host
software of the Switch Fabric of the Switch 7758.