BigIron RX Series Configuration Guide 26553-1002253-01Configuring LLDP 9where is a value between 1 and 8192. The default is two seconds. Note that this valuemust not be greater than one quarter of the LLDP transmission interval (CLI command lldptransmit-interval).Changing the interval between regular LLDP transmissionsThe LLDP transmit interval specifies the number of seconds between regular LLDP packettransmissions. When you enable LLDP, by default, the device will wait 30 seconds between regularLLDP packet transmissions. If desired, you can change the default behavior from 30 seconds to avalue between 5 and 32768 seconds.To change the LLDP transmission interval, enter a command such as the following at the GlobalCONFIG level of the CLI.BigIron RX(config)#lldp transmit-interval 40The above command causes the LLDP agent to transmit LLDP frames every 40 seconds.Syntax: [no] lldp transmit-interval where is a value from 5 to 32768. The default is 30 seconds.NOTESetting the transmit interval or transmit holdtime multiplier to inappropriate values can cause theLLDP agent to transmit LLDPDUs with TTL values that are excessively high. This in turn can affecthow long a receiving device will retain the information if it is not refreshed.Changing the holdtime multiplier for transmit TTLThe holdtime multiplier for transmit TTL is used to compute the actual time-to-live (TTL) value usedin an LLDP frame. The TTL value is the length of time the receiving device should maintain theinformation in its MIB. When you enable LLDP, the device automatically sets the holdtimemultiplier for TTL to four. If desired, you can change the default behavior from four to a valuebetween two and ten.To compute the TTL value, the system multiplies the LLDP transmit interval by the holdtimemultiplier. 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 CONFIGlevel of the CLI.BigIron RX(config)#lldp transmit-hold 6Syntax: [no] lldp transmit-hold .where is a number from 2 to 10. The default value is 4.NOTESetting the transmit interval or transmit holdtime multiplier to inappropriate values can cause theLLDP agent to transmit LLDPDUs with TTL values that are excessively high. This in turn can affecthow long a receiving device will retain the information if it is not refreshed.
