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3-12 SmartSwitch ATM User Guide
Managing Parallel PNNI Links PNNI Routing
However, certain time-sensitive implementations of PNNI may require that link fail occur either immediately or after
a period of time longer than three seconds. Use the
set linkmonitortimeout command to control the time required
for the SmartSwitch ATM switch to assume a link has failed.
For example, two SmartSwitch ATM switches are connected with parallel PNNI links. To configure the switches to
immediately recognize any lapse in traffic as a downed link, enter the following on both switches:
SmartSwitch # set linkmonitortimeout
TimeoutValue(3) : 0 — Make the timeout instantaneous
SmartSwitch #
If a traffic lapse occurs on one of the links, that link’s port immediately frees up all resource, and all traffic is routed
between the switches through the remaining link.
Notice that the
set linkmonitortimeout command controls the TimeoutValue on a switch-wide basis (not a per-port
basis).
Caution
Remember that while some special uses of PNNI may require the TimeoutValue
to be zero (0), setting the
TimeoutValue to less than three seconds may cause
the PNNI network to “bounce,” entering a state of constant (and unnecessary)
reconfiguration. For this reason, care should be taken when setting the
TimeoutValue to less than three seconds.