beautypg.com

Changing the holdtime multiplier for transmit ttl – Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) User Manual

Page 124

background image

94

Multi-Service IronWare Switching Configuration Guide

53-1003036-02

Using LLDP

4

NOTE

The LLDP transmit delay timer must not be greater than one quarter of the LLDP transmission
interval (CLI command lldp transmit-interval).

Changing the interval between regular LLDP transmissions

The LLDP transmit interval specifies the number of seconds between regular LLDP packet
transmissions. When LLDP is enabled, by default, the device waits 30 seconds between regular
LLDP packet transmissions. To change the LLDP transmission interval, enter the lldp
transmit-interval command.

Brocade(config)# lldp transmit-interval 5

Syntax: [no] lldp transmit-interval seconds

The seconds variable specifies the notification interval with a range of 5 to 32768 seconds.

NOTE

Setting the transmit interval or transmit holdtime multiplier 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. The default setting of holdtime multiplier for TTL to 4. This is the age out time for that
particular advertisement. 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 for TTL from the default value, use the lldp transmit-hold
command.

Brocade(config)# lldp transmit-hold 4

Syntax: lldp transmit-hold value

The value variable specifies holdtime multiplier for transmit TTL with a range of 4 to 10.

NOTE

Setting the transmit interval or transmit holdtime multiplier to inappropriate values can cause the
LLDP agent to transmit LLDPDUs with TTL values that are excessively high.

Changing the minimum time between port reinitializations

The LLDP re-initialization delay timer specifies the minimum amount of time the device waits from
when LLDP is disabled on a port, until it honors a request to re-enable LLDP on that port. When
LLDP is enabled, the default is set to 2 seconds. The LLDP re-initialization delay timer ensures that
there is a defined minimum amount of time between successive LLDP frame transmission, thereby
preventing a large number of LLDP frames to be sent at one time.

To change the LLDP re-initialization delay timer, enter the ldp reinit-delay command.

Brocade(config)# lldp reinit-delay 2