Configuring for Network Management Applications

LLDP (Link-Layer Discovery Protocol)

information on displaying the currently configured port speed and duplex on an LLDP-MED endpoint, refer to “Displaying the Current Port Speed and Duplex Configuration on a Switch Port” on page 13-69.

Syntax: show interfaces brief < port-list>

Includes port speed and duplex configuration in the Mode column of the resulting display.

Displaying Advertisements Currently in the Neighbors MIB. These commands display the content of the inbound LLDP advertisements received from other LLDP devices.

Syntax show lldp info remote-device [ port-list]

Without the [ port-list ] option, this command provides a global list of the individual devices it has detected by reading LLDP advertisements. Discovered devices are listed by the inbound port on which they were discovered. Multiple devices listed for a single port indicates that such devices are connected to the switch through a hub.

Discovering the same device on multiple ports indicates that the remote device may be connected to the switch in one of the following ways:

–Through different VLANS using separate links. (This applies to switches that use the same MAC address for all configured VLANs.)

–Through different links in the same trunk.

–Through different links using the same VLAN. (In this case, spanning-tree should be invoked to prevent a net­ work topology loop. Note that LLDP packets travel on links that spanning-tree blocks for other traffic types.)

With the [port-list]option, this command provides a listing of the LLDP data that the switch has detected in advertisements received on the specified ports.

For descriptions of the various types of information displayed by these commands, refer to Table 13-3 on page 13-39.

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