Cabletron Systems 04-0053-01 manual SmartSwitch # set linkmonitortimeout

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.

3-12 SmartSwitch ATM User Guide