3Com CoreBuilder 5000 User Manual page 28

2-6 D Y N
ESIGNING OUR ETWORK
After you configure redundancy:
1 A switchover to the backup link occurs under three conditions:
Link failure
Port partition
Link unstable (carrier integrity failure, port isolated)
2 The switchover occurs and the backup link becomes operational. The
system performs a switchover back to the primary link automatically
after the failure or port partition problem is resolved.
Although you can configure redundancy between two ports on a single
module, you should configure redundancy between two ports on two
different modules. This provides additional protection if, for example,
one of the modules becomes inoperative.
If redundant front panel ports are set up from a Workgroup
FastModule to a single switching FastModule, then configure the
single switching FastModule using resilient link ( a resilient link consists
of a main link and a standby link ) and set the port on the Workgroup
FastModule to Remote Diagnostic mode. This sets up the remote fault
tolerance feature.
Refer to the CoreBuilder 5000 Distributed Management Module User
Guide for more information on setting redundancy between ports and
refer to the CoreBuilder 5000 FastModule User Guide for detailed
information on switching FastModules.