Brocade Communications Systems 6650 Changing the interval between regular Lldp transmissions

8 LLDP configuration

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.

Brocade(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>

The <seconds> variable 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.

Brocade(config)#lldp transmit-hold 6

Syntax: [no] lldp transmit-hold <value>

The <value> variable 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.

198	Brocade ICX 6650 Administration Guide
	53-1002600-01