Cabletron Systems 04-0053-01 manual UNI Link Timing, SmartSwitch # set linkmonitortimeout

UNI Routes Routing

4.Enter the show atmroute command to check that the UNI route was added.

SmartSwitch # show atmroute
AddressNumber(ALL)			:
No. Port		Route Address		Type Protocol
================================================================================
1	7B4	39:00:00:00:00:00:00:00:00:00:14:41:80:00:20:d4:14:41:80		I	MGMT
2	7B4	39:00:00:00:00:00:00:00:00:00:14:41:80:00:20:d4:14:41:81		I	MGMT
3	--	39:00:00:00:00:00:00:00:00:00:14:59:00		I	PNNI
4	7A2	39:00:00:00:00:00:00:00:00:00:14:59:00:00:11:22:33:44:55		I	MGMT — Our added UNI route
5	--	39:00:00:00:00:00:00:00:00:00:28:e9:80		I	PNNI
6	--	39:00:00:00:00:00:00:00:00:00:28:f5:00		I	PNNI
7	7B4	47:00:79:00:00:00:00:00:00:00:00:00:00:00:a0:3e:00:00:01		I	MGMT
8	5B2	52:00:00:00:00:00:00:00:00:00:14:51:80		I	MGMT

SmartSwitch #

The UNI route appears in the table as Route 4, with Protocol Type of MGMT (management).

Note For UNI routes to work with certain devices, ILMI may also need to be disabled on the ATM SmartSwitch. Use the set portconfig command to disable ILMI on the ATM SmartSwitch on a per-port basis.

4.3.1UNI Link Timing

By default, if a UNI link loses connectivity, the link fails after three (3) seconds. This short amount of time is designed as a buffer in case of minor latency. By waiting three seconds before releasing resources and tearing down the connection, a minor latency occurrence (less than three seconds) will not bring down the route.

However, certain time-sensitive implementations may require that link fail occurs either immediately or after a longer period of time than three seconds. Use the set linkmonitortimeout command to control the time required for the SmartSwitch ATM switch to assume a UNI route has failed.

For example, a SmartSwitch ATM switch is connected to two UNI uplinks (one active, one standby) through two separate ports. One switch port is connected to the active UNI uplink and the other switch port is connected to the standby UNI uplink. To configure the switch to immediately recognize any lapse in traffic on the active UNI uplink port as a downed link, enter the following on the SmartSwitch ATM switch:

SmartSwitch # set linkmonitortimeout
TimeoutValue(3)	: 0 — Make the timeout instantaneous

SmartSwitch #

If the active UNI uplink fails-over to the standby UNI uplink, the SmartSwitch ATM switch port connected to the failed active uplink immediately frees up all resources, and begins accepting traffic on the port connected to the standby UNI uplink.

Notice that the set linkmonitortimeout command controls the TimeoutValue on a switch-wide basis (not a per-port basis).

4-6 SmartSwitch ATM User Guide