Configuration Guide User guide

464 FastIron Configuration Guide
53-1002494-02
LLDP configuration
NOTE
The LLDP transmit delay timer must not be greater than one quarter of the LLDP transmission
interval (CLI command lldp transmit-interval).
The LLDP transmit delay timer prevents an LLDP agent from transmitting a series of successive
LLDP frames during a short time period, when rapid changes occur in LLDP. It also increases the
probability that multiple changes, rather than single changes, will be reported in each LLDP frame.
To change the LLDP transmit delay timer, enter a command such as the following at the Global
CONFIG level of the CLI.
Brocade(config)#lldp transmit-delay 7
The above command causes the LLDP agent to wait a minimum of seven seconds after
transmitting an LLDP frame and before sending another LLDP frame.
Syntax: [no] lldp transmit-delay <seconds>
where <seconds> is a value between 1 and 8192. The default is two seconds. Note that this value
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 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>
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.