User's Manual

C HAPTER 4 | Configuring the Switch
Link Layer Discovery Protocol
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4. Enter the IP address of the multicast service to be filtered.
5. Click Save.
Figure 61: MLD Snooping Port Group Filtering Configuration
LINK LAYER DISCOVERY PROTOCOL
Link Layer Discovery Protocol (LLDP) is used to discover basic information
about neighboring devices on the local broadcast domain. LLDP is a Layer 2
protocol that uses periodic broadcasts to advertise information about the
sending device. Advertised information is represented in Type Length Value
(TLV) format according to the IEEE 802.1AB standard, and can include
details such as device identification, capabilities and configuration settings.
LLDP also defines how to store and maintain information gathered about
the neighboring network nodes it discovers.
CONFIGURING LLDP
TIMING AND TLVS
Use the LLDP Configuration page to set the timing attributes used for the
transmission of LLDP advertisements, and the device information which is
advertised.
PATH
Advanced Configuration, LLDP
PARAMETERS
These parameters are displayed:
LLDP Timing Attributes
◆ Tx Interval – Configures the periodic transmit interval for LLDP
advertisements. (Range: 5-32768 seconds; Default: 30 seconds)
This attribute must comply with the following rule:
(Transmission Interval * Transmission Hold Time) ≤ 65536,
and Transmission Interval ≥ (4 * Transmission Delay)
◆ Tx Hold – Configures the time-to-live (TTL) value sent in LLDP
advertisements as shown in the formula below. (Range: 2-10;
Default: 3)
The time-to-live tells the receiving LLDP agent how long to retain all
information pertaining to the sending LLDP agent if it does not transmit
updates in a timely manner.
TTL in seconds is based on the following rule: