LLDP operation configuration options
In the default configuration, LLDP is enabled and in both transmit and receive mode on all active ports. The LLDP
configuration includes global settings, which apply to all active ports on the switch, and per-port settings, which
affect only the operation of the specified ports.
The commands in the LLDP sections affect both LLDP and LLDP-MED operation. For information on operation
and configuration unique to LLDP-MED, see LLDP-MED (media-endpoint-discovery) on page 187.
Enable or disable LLDP on the switch
In the default configuration, LLDP is globally enabled on the switch. To prevent transmission or receipt of LLDP
traffic, you can disable LLDP operation.
Enable or disable LLDP-MED
In the default configuration for the switches, LLDP-MED is enabled by default. (Requires that LLDP is also
enabled.) For more information, see
LLDP-MED (media-endpoint-discovery) on page 187.
Change the frequency of LLDP packet transmission to neighbor devices
On a global basis, you can increase or decrease the frequency of outbound LLDP advertisements.
Change the Time-To-Live for LLDP packets sent to neighbors
On a global basis, you can increase or decrease the time that the information in an LLDP packet outbound from
the switch will be maintained in a neighbor LLDP device.
Transmit and receive mode
With LLDP enabled, the switch periodically transmits an LLDP advertisement (packet) out each active port
enabled for outbound LLDP transmissions and receives LLDP advertisements on each active port enabled to
receive LLDP traffic (Configuring per-port transmit and receive modes (CLI) on page 182). Per-port
configuration options include four modes:
• Transmit and receive (tx_rx): This is the default setting on all ports. It enables a given port to both transmit
and receive LLDP packets and to store the data from received (inbound) LLDP packets in the switch's MIB.
• Transmit only (txonly): This setting enables a port to transmit LLDP packets that can be read by LLDP
neighbors. However, the port drops inbound LLDP packets from LLDP neighbors without reading them. This
prevents the switch from learning about LLDP neighbors on that port.
• Receive only (rxonly): This setting enables a port to receive and read LLDP packets from LLDP neighbors
and to store the packet data in the switch's MIB. However, the port does not transmit outbound LLDP packets.
This prevents LLDP neighbors from learning about the switch through that port.
• Disable (disable): This setting disables LLDP packet transmissions and reception on a port. In this state, the
switch does not use the port for either learning about LLDP neighbors or informing LLDP neighbors of its
presence.
SNMP notification
You can enable the switch to send a notification to any configured SNMP trap receiver(s) when the switch detects
a remote LLDP data change on an LLDP-enabled port (Configuring SNMP notification support on page 181).
Per-port (outbound) data options
The following table lists the information the switch can include in the per-port, outbound LLDP packets it
generates. In the default configuration, all outbound LLDP packets include this information in the TLVs transmitted
Chapter 8 Configuring for Network Management Applications 173
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