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Adjusting the Time-To-Live value for LLDP advertisements

Time-To-Live (TTL) is the period of time for which LLDP advertisements are stored in cache in neighboring LLDP-compliant devices. TTL is advertised in each LLDP packet and is updated whenever an LLDP packet is received by a node. TTL can be modified in outgoing LLDP frames.

About this task

  • TTL is a calculated value, the product of the transmit interval (lldp.xmit.interval) and the hold multiplier (lldp.xmit.hold) plus one.

  • The default hold multiplier value is 4, but you can enter values ranging from 1 to 100.

  • The default TTL is therefore 121 seconds, as recommended by IEEE, but by adjusting the transmit interval and hold multiplier values, you can specify a value for outgoing frames from 6 seconds to 30001 seconds.

  • If an IP address is removed before the TTL expires, the LLDP information is cached until the TTL expires.

  1. Display the current hold multiplier value for a node, or for all nodes in a cluster:
    • Single node: run -node node_name options lldp.xmit.hold
    • All nodes: options lldp.xmit.hold
  2. Adjust the hold multiplier value on all ports of a node, or on all ports of all nodes in a cluster:
    • Single node: run -node node_name options lldp.xmit.hold hold_value
    • All nodes: options lldp.xmit.hold hold_value