8 Link Layer Discovery Protocol (LLDP)
The IEEE 802.1AB defined standard, Link Layer Discovery Protocol (LLDP), allows stations residing
on an IEEE 802 LAN to advertise major capabilities and physical descriptions. This information is
viewed by a network manager to identify system topology and detect bad configurations on the
LAN.
LLDP is a one-way protocol; there are no request/response sequences. Information is advertised
by stations implementing the transmit function, and is received and processed by stations
implementing the receive function. The transmit and receive functions can be enabled/disabled
separately per port. By default, both transmit and receive are enabled on all ports. The application
is responsible for starting each transmit and receive state machine appropriately, based on the
configured status and operational state of the port.
LLDP Configuration
Use the LLDP Configuration page to specify global LLDP parameters and to configure the protocol
on individual ports.
To display the LLDP Configuration page, click
LLDP > LLDP Configuration
in the navigation pane.
Figure 36 LLDP Configuration Page
Table 29 LLDP Configuration Fields
Description
Field
Global Mode
Specify the interval at which frames are transmitted. The default is 30 seconds, and the
valid range is 5–32768 seconds.
Transmit Interval
Specify the multiplier on the transmit interval to, which is used to compute the TTL (range
2–10, default = 4).
Transmit Hold
Specify the delay before a re-initialization (range 1–10 seconds, default = 2).
Re-Initialization Delay
50
Link Layer Discovery Protocol (LLDP)
