Dell FCX624-E Laptop User Manual


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PowerConnect B-Series FCX Configuration Guide 693
53-1002266-01
Configuring LLDP
24
Configuration notes and considerations
LLDP is supported on Ethernet interfaces only.
If a port is 802.1X-enabled, the transmission and reception of LLDP packets will only take
place while the port is authorized.
Cisco Discovery Protocol (CDP) and Brocade Discovery Protocol (FDP) run independently of
LLDP. Therefore, these discovery protocols can run simultaneously on the same device.
By default, the Dell PowerConnect device limits the number of neighbors per port to four, and
staggers the transmission of LLDP packets on different ports, in order to minimize any
high-usage spikes to the CPU.
By default, the Dell PowerConnect device forwards
Ports that are in blocking mode (spanning tree) can still receive LLDP packets from a
forwarding port.
Auto-negotiation status indicates what is being advertised by the port for 802.3
auto-negotiation.
Enabling and disabling LLDP
LLDP is enabled by default on individual ports. However, to run LLDP, you must first enable it on a
global basis (on the entire device).
To enable LLDP globally, enter the following command at the global CONFIG level of the CLI.
PowerConnect(config)#lldp run
Syntax: [no] lldp run
Enabling and disabling TLV advertisements When LLDP transmit is enabled, by default, the Dell
PowerConnect device will automatically advertise LLDP
capabilities, except for the system description, VLAN name,
and power-via-MDI information, which may be configured by
the system administrator.
Also, if desired, you can disable the advertisement of
individual TLVs.
Changing the minimum time between LLDP
transmissions
Automatically set to 2 seconds
Changing the interval between regular LLDP
transmissions
Automatically set to 30 seconds
Changing the holdtime multiplier for transmit TTL Automatically set to 4
Changing the minimum time between port
reinitializations
Automatically set to 2 seconds
TABLE 123 LLDP global configuration tasks and default behavior /value (Continued)
Global task Default behavior / value when LLDP is enabled