Configuring for Network Management Applications

LLDP (Link-Layer Discovery Protocol)

LLDP-MED Fast Start Control

Syntax: lldp fast-start-count < 1 - 10 >

An LLDP-MED device connecting to a switch port may use the data contained in the MED TLVs from the switch to configure itself. However, the lldp refresh-intervalsetting (default: 30 seconds) for transmitting advertisements can cause an unacceptable delay in MED device configuration. To support rapid LLDP-MED device configuration, the lldp fast-start-countcommand temporarily overrides the refresh- interval setting for the fast-start-countadvertisement interval. This results in the port initially advertising LLDP-MED at a faster rate for a limited time. Thus, when the switch detects a new LLDP-MED device on a port, it transmits one LLDP­ MED advertisement per second out the port for the duration of the fast-start-countinterval. In most cases, the default setting should provide an adequate fast-start-countinterval.

(Range: 1 - 10 seconds; Default: 5 seconds)

Note: This global command applies only to ports on which a new LLDP-MED device is detected. It does not override the refresh-interval setting on ports where non-MED devices are detected.

Advertising Device Capability, Network Policy, PoE Status and Location Data

The medTlvEnable option on the switch is enabled in the default configuration and supports the following LLDP-MED TLVs:

■LLDP-MED capabilities: This TLV enables the switch to determine:

•whether a connected endpoint device supports LLDP-MED

•which specific LLDP-MED TLVs the endpoint supports

•the device class (1, 2, or 3) for the connected endpoint

This TLV also enables an LLDP-MED endpoint to discover what LLDP­

MED TLVs the switch port currently supports.

■network policy operating on the port to which the endpoint is connected (VLAN, Layer 2 QoS, Layer 3 QoS)

■PoE (MED Power-over-Ethernet)

■physical location data — page 13-62

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