Configuring for Network Management Applications

LLDP (Link-Layer Discovery Protocol)

Syntax: [ no ] lldp config < port-list> dot3TlvEnable macphy_config

For outbound advertisements, this TLV includes the (local) switch port’s current speed and duplex settings, the range of speed and duplex settings the port supports, and the method required for reconfiguring the speed and duplex settings on the device (auto-negotiation during link initialization, or manual configuration).

Using SNMP to compare local and remote information can help in locating configuration mismatches.

(Default: Enabled)

Note: For LLDP operation, this TLV is optional. For LLDP-MED operation, this TLV is mandatory.

As mentioned above, an SNMP network management application can be used to compare the port speed and duplex data configured in the switch and advertised by the LLDP endpoint. You can also use the CLI to display this information. For more on using the CLI to display port speed and duplex information, refer to “Displaying the Current Port Speed and Duplex Configuration on a Switch Port” on page 13-69.

LLDP-MED (Media-Endpoint-Discovery)

LLDP-MED (ANSI/TIA-1057/D6) extends the LLDP (IEEE 802.1AB) industry standard to support advanced features on the network edge for Voice Over IP (VoIP) endpoint devices with specialized capabilities and LLDP-MED standards-based functionality. LLDP-MED in the switches uses the standard LLDP commands described earlier in this section, with some extensions, and also introduces new commands unique to LLDP-MED operation. The show commands described elsewhere in this section are applicable to both LLDP and LLDP-MED operation. LLDP-MED benefits include:

■plug-and-play provisioning for MED-capable, VoIP endpoint devices

■simplified, vendor-independent management enabling different IP telephony systems to interoperate on one network

■automatic deployment of convergence network policies (voice VLANs, Layer 2/CoS priority, and Layer 3/QoS priority)

■configurable endpoint location data to support the Emergency Call Service (ECS) (such as Enhanced 911 service, 999, 112)

■detailed VoIP endpoint data inventory readable via SNMP from the switch

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