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Changing the interval between regular LLDP transmissions
The LLDP transmit interval specifies the number of seconds between regular LLDP packet
transmissions. When you enable LLDP, by default, the device will wait 30 seconds between regular
LLDP packet transmissions. If desired, you can change the default behavior from 30 seconds to a value
between 5 and 32768 seconds.
To change the LLDP transmission interval, enter a command such as the following at the Global
CONFIG level of the CLI.
device(config)#lldp transmit-interval 40
The above command causes the LLDP agent to transmit LLDP frames every 40 seconds.
Syntax:[no] lldp transmit-interval seconds
where seconds is a value from 5 to 32768. The default is 30 seconds.
NOTE
Setting the transmit interval or transmit holdtime multiplier, or both, to inappropriate values can cause
the LLDP agent to transmit LLDPDUs with TTL values that are excessively high. This in turn can affect
how long a receiving device will retain the information if it is not refreshed.
Changing the holdtime multiplier for transmit TTL
The holdtime multiplier for transmit TTL is used to compute the actual time-to-live (TTL) value used in
an LLDP frame. The TTL value is the length of time the receiving device should maintain the information
in its MIB. When you enable LLDP, the device automatically sets the holdtime multiplier for TTL to four.
If desired, you can change the default behavior from four to a value between two and ten.
To compute the TTL value, the system multiplies the LLDP transmit interval by the holdtime multiplier.
For example, if the LLDP transmit interval is 30 and the holdtime multiplier for TTL is 4, then the value
120 is encoded in the TTL field in the LLDP header.
To change the holdtime multiplier, enter a command such as the following at the Global CONFIG level
of the CLI.
device(config)#lldp transmit-hold 6
Syntax:[no] lldp transmit-hold value
where value is a number from 2 to 10. The default value is 4.
NOTE
Setting the transmit interval or transmit holdtime multiplier, or both, to inappropriate values can cause
the LLDP agent to transmit LLDPDUs with TTL values that are excessively high. This in turn can affect
how long a receiving device will retain the information if it is not refreshed.
Changing the minimum time between port reinitializations
The LLDP re-initialization delay timer specifies the minimum number of seconds the device will wait
from when LLDP is disabled on a port, until it will honor a request to re-enable LLDP on that port. When
you enable LLDP, the system sets the re-initialization delay timer to two seconds. If desired, you can
change the default behavior from two seconds to a value between one and ten seconds.
Changing the interval between regular LLDP transmissions
FastIron Ethernet Switch Administration Guide 189
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