Lldp Transmit Features; Scheduled Interval; Minimum Interval - Lenovo Flex System Fabric CN4093 Application Manual

LLDP Transmit Features

Scheduled Interval

Minimum Interval

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CN4093 Application Guide for N/OS 8.4
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.
Note: In stacking mode, only the stack Master transmits LLDP information for all
the ports in a stack. The stack MAC address is used as the source address in the
LLDP packets.
The CN4093 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:
CN 4093(config)# lldp refresh-interval <interval>
where interval is the number of seconds between LLDP transmissions. The range is
5 to 32768. The default is 30 seconds.
In addition to sending LLDP information at scheduled intervals, LLDP
information is also sent when the CN4093 detects relevant changes to its
configuration or status (such as when ports are enabled or disabled). To prevent
the CN4093 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:
CN 4093(config)# lldp transmission-delay <interval>
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.