Link Layer Discovery Protocol; Setting Lldp Timing Attributes - Edge-Core ECS4110-28T Management Manual

L L D
INK AYER ISCOVERY
S LLDP
ETTING
T A
IMING TTRIBUTES
P
ROTOCOL
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.
Link Layer Discovery Protocol - Media Endpoint Discovery (LLDP-MED) is an
extension of LLDP intended for managing endpoint devices such as Voice
over IP phones and network switches. The LLDP-MED TLVs advertise
information such as network policy, power, inventory, and device location
details. LLDP and LLDP-MED information can be used by SNMP applications
to simplify troubleshooting, enhance network management, and maintain
an accurate network topology.
Use the Administration > LLDP (Configure Global) page to set attributes for
general functions such as globally enabling LLDP on the switch, setting the
message ageout time, and setting the frequency for broadcasting general
advertisements or reports about changes in the LLDP MIB.
CLI R
EFERENCES
"LLDP Commands" on page 1323
◆
P
ARAMETERS
These parameters are displayed:
LLDP – Enables LLDP globally on the switch. (Default: Enabled)
◆
◆ Transmission Interval – Configures the periodic transmit interval for
LLDP advertisements. (Range: 5-32768 seconds; Default: 30 seconds)
Hold Time Multiplier – Configures the time-to-live (TTL) value sent in
◆
LLDP advertisements as shown in the formula below. (Range: 2-10;
Default: 4)
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:
minimum value ((Transmission Interval * Holdtime Multiplier), or
Therefore, the default TTL is 4*30 = 120 seconds.
Delay Interval – Configures a delay between the successive
◆
transmission of advertisements initiated by a change in local LLDP MIB
variables. (Range: 1-8192 seconds; Default: 2 seconds)
The transmit delay is used to prevent a series of successive LLDP
transmissions during a short period of rapid changes in local LLDP MIB
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| Basic Administration Protocols
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HAPTER

Link Layer Discovery Protocol

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