Configuring The Gmap Gap Time Interval; Configuring The Gmap Update Time Interval - Alcatel OmniSwitch 6800 Series Network Configuration Manual

Configuring GMAP

Configuring the GMAP Gap Time Interval

The GMAP gap time interval determines the interpacket time used when multiple packets are required for
an update. When there are many MAC addresses on mobile ports, more than one GMAP packet is required
for an update. Typically there is no need to alter the gaptime interval, but you may want to modify it if
traffic spikes are occurring on the network.
Note. The switch approximates the gaptime interval because its internal clock does not use milliseconds.
For any value shorter than one second, the switch uses 1/60 second increments called "ticks." The default
gaptime interval is 8 ticks or approximately 133 milliseconds. Any value you enter will be rounded to the
nearest tick.
To display the current gaptime interval, enter the following command:
-> show gmap
To change the gaptime interval, use either of these forms of the command with the desired value (any
value between 1 and 65535). Note that use of the time command keyword is optional. For example:
-> gmap gap 500
-> gmap gap time 250

Configuring the GMAP Update Time Interval

The GMAP update time interval specifies the number of seconds for GMAP to wait between each update
and the transmission of GMAP information.
Note. The switches avoid synchronization by jittering the update time interval by plus or minus one quar-
ter of the configured interval. For example, if the default of 300 seconds is used, the jitter is plus or minus
75 seconds.
To display the current update time, enter the following command:
-> show gmap
To change the updatetime interval, use either of these forms of the command with the desired value (any
value between 1 and 65535). Note that use of the time command keyword is optional. For example:
-> gmap update 1200
-> gmap update time 60
page 8-10 OmniSwitch 6800 Series Network Configuration Guide
Using Interswitch Protocols
November 2004