106
Querier Election Participate Mode.............. Disable
Querier VLAN Address........................... ::
Operational State.............................. Querier
Operational version............................ 1
Operational Max Resp Time...................... 10
3.11. LLDP and LLDP-MED
LLDP is a standardized discovery protocol defined by IEEE 802.1AB. It allows stations residing on an 802 LAN
to advertise major capabilities physical descriptions, and management information to physically adjacent
devices allowing a network management system (NMS) to access and display this information.
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 on each switch port.
LLDP-MED is an extension of the LLDP standard. LLDP-MED uses LLDP's organizationally-specific Type-
Length-Value (TLV) extensions and defines new TLVs that make it easier for a VoIP deployment in a wired or
wireless LAN/MAN environment. It also makes mandatory a few optional TLVs from LLDP and recommends
not transmitting some TLVs.
The TLVs only communicate information; these TLVs do not automatically translate into configuration. An
external application may query the MED MIB and take management actions in configuring functionality.
LLDP and LLDP-MED are used primarily in conjunction with network management tools to provide
information about network topology and configuration, and to help troubleshoot problems that occur on
the network. The discovery protocols can also facilitate inventory management within a company.
LLDP and the LLDP-MED extension are vendor-neutral discovery protocols that can discover devices made
by numerous vendors. LLDP-MED is intended to be used on ports that connect to VoIP phones. Additional
applications for LLDP-MED include device location (including for Emergency Call Service/E911) and Power
over Ethernet management.
3.11.1. LLDP and Data Center Application
DCBX uses TLV information elements over LLDP to exchange information, so LLDP must be enabled on the
port to enable the information exchange.
3.11.2. Configuring LLDP
This example shows how to configure LLDP settings for the switch and to allow port 0/3 to transmit all LLDP
information available.
To configure the switch:
1. Configure the transmission interval, hold multiplier, and reinitialization delay for LLDP PDUs sent from
the switch.
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