HP ProCurve 6400cl Series Management And Configuration Manual page 334

Configuring for Network Management Applications
LLDP (Link-Layer Discovery Protocol)
Note for 3400cl and
6400cl Switches
14-38
If the read-only CDP capability in a Series 3400cl or 6400cl switch remains
enabled when LLDP is disabled, then the switch continues to read CDP
packets and update the CDP entries in the Neighbors table. In this case, show
cdp neighbors continues to display the table entries, while show lldp info remote
device displays empty fields.
Changing the Transmission Interval for LLDP Packets. This interval
controls how often active ports retransmit advertisements to their neighbors.
Syntax lldp refresh-interval < 5 - 32768 >
Changes the interval between consecutive transmissions of
LLDP advertisements on any given port. (Default: 30 seconds)
Note: The refresh-interval must be greater than or equal to
(4 x delay-interval). (The default delay-interval is 2). For exam­
ple, with the default delay-interval, the lowest refresh-interval you
can use is 8 seconds (4 x 2 = 8). Thus, if you want a refresh-
interval of 5 seconds, you must first change the delay interval
to 1 (that is, 4 x 1 < 5). If you want to change the delay-interval,
use the setmib command. (Refer to page 14-39.)
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-multiplier is at the default, the Time-to-Live for advertisements trans­
mitted from the switch is 60 seconds (4 x 15). To reduce the Time-to-Live, you
could lower the holdtime-interval to 2, which would result in a Time-to-Live of
30 seconds.
HPswitch(config)# lldp holdtime-multiplier 2