Configuring for Network Management Applications

LLDP (Link-Layer Discovery Protocol)

Changing the Time-to-Live for Transmitted Advertisements. The Time-to-Live value (in seconds) for all LLDP advertisements transmitted from a switch is controlled by the switch that generates the advertisement, and determines how long an LLDP neighbor retains the advertised data before discarding it. The Time-to-Live value is the result of multiplying the refresh- interval by the holdtime-multiplier described below.

Syntax lldp holdtime-multiplier < 2 - 10 >

Changes the multiplier an LLDP switch uses to calculate the Time-to-Live for the LLDP advertisements it generates and transmits to LLDP neighbors. When the Time-to-Live for a given advertisement expires the advertised data is deleted from the neighbor switch’s MIB. (Default: 4; Range: 2 - 10)

For example, if the refresh-interval on the switch is 15 seconds and the holdtime-multiplieris at the default, the Time-to-Live for advertisements transmitted from the switch is 60 seconds (4 x 15). To reduce the Time-to-Live, you could lower the holdtime-intervalto 2, which would result in a Time-to- Live of 30 seconds.

ProCurve(config)# lldp holdtime-multiplier 2

Changing the Delay Interval Between Advertisements Generated by

Value or Status Changes to the LLDP MIB. The switch uses a delay- interval setting to delay transmitting successive advertisements resulting from these LLDP MIB changes. If a switch is subject to frequent changes to its LLDP MIB, lengthening this interval can reduce the frequency of successive advertisements. The delay-interval can be changed using either an SNMP network management application or the CLI setmib command.

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