Brocade BigIron RX Series Configuration Guide - Manual (Page 344)

266 BigIron RX Series Configuration Guide
53-1002484-04
Configuring LLDP
9
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.
BigIron RX(config)# lldp transmit-hold 6
Syntax: [no] lldp transmit-hold <value>
where <value> is a number from 2 to 10. The default value is 4.
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 minimum time between port
reinitializations
The LLDP re-initialization delay timer specifies the minimum number of seconds the device will wait
from when LLDP is disabled on a port, until it will honor a request to re-enable LLDP on that port.
When you enable LLDP, the system sets the re-initialization delay timer to two seconds. If desired,
you can change the default behavior from two seconds to a value between one and ten 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 set the re-initialization delay timer, enter a command such as the following at the Global CONFIG
level of the CLI.
BigIron RX(config)# lldp reinit-delay 5
The above command causes the device to wait five seconds after LLDP is disabled, before
attempting to honor a request to re-enable it.
Syntax: [no] lldp reinit-delay <seconds>
where <seconds> is a value from 1 – 10. The default is two seconds.
LLDP TLVs advertised by the Brocade device
When a port is enabled to transmit LLDP packets, it will advertise the following information to other
LLDP agents in the same 802 LAN segments:
• Chassis ID