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BLADEOS 6.5.2 Application Guide
BMD00220, October 2010 Chapter 25: Link Layer Discovery Protocol 347
LLDP Transmit Features
Numerous LLDP transmit options are available, including scheduled and minimum transmit
interval, expiration on remote systems, SNMP trap notification, and the types of information
permitted to be shared.
Scheduled Interval
The G8124 can be configured to transmit LLDP information to neighboring devices once each 5 to
32768 seconds. The scheduled interval is global; the same interval value applies to all LLDP
transmit-enabled ports. However, to help balance LLDP transmissions and keep them from being
sent simultaneously on all ports, each port maintains its own interval clock, based on its own
initialization or reset time. This allows switch-wide LLDP transmissions to be spread out over time,
though individual ports comply with the configured interval.
The global transmit interval can be configured using the following command:
where interval is the number of seconds between LLDP transmissions. The range is 5 to 32768. The
default is 30 seconds.
Minimum Interval
In addition to sending LLDP information at scheduled intervals, LLDP information is also sent
when the G8124 detects relevant changes to its configuration or status (such as when ports are
enabled or disabled). To prevent the G8124 from sending multiple LLDP packets in rapid
succession when port status is in flux, a transmit delay timer can be configured.
The transmit delay timer represents the minimum time permitted between successive LLDP
transmissions on a port. Any interval-driven or change-driven updates will be consolidated until the
configured transmit delay expires.
The minimum transmit interval can be configured using the following command:
where interval is the minimum number of seconds permitted between successive LLDP
transmissions on any port. The range is 1 to one-quarter of the scheduled transmit interval (lldp
refresh-interval <value>), up to 8192. The default is 2 seconds.
RS G8124(config)# lldp refresh-interval <interval>
RS G8124(config)# lldp transmission-delay <interval>