System information

Configuring for Network Management Applications
LLDP (Link-Layer Discovery Protocol)
Configuring Support for Port Speed and Duplex
Advertisements on the 5300xl and 4200vl Switches
This feature operates only on 5300xl switches running software release E.10.x
or greater, and 4200vl switches.
This feature is enabled in the default LLDP-MED configuration on 5300xl
switches running software release E.10.x or greater, and on 4200vl switches.
It is optional for LLDP operation, but is required for LLDP-MED operation.
Port speed and duplex advertisements are supported on 5300xl switches and
4200vl switches to inform an LLDP endpoint and the switch port of each
other’s port speed and duplex configuration and capabilities. Configuration
mismatches between a switch port and an LLDP endpoint can result in
excessive collisions and voice quality degradation. LLDP enables discovery of
such mismatches by supporting SNMP access to the switch MIB for comparing
the current switch port and endpoint settings. (Changing a current device
configuration to eliminate a mismatch requires intervention by the system
operator.)
Syntax: [ no ] lldp config < port-list > dot3TlvEnable macphy_config
Note: This command applies only to 5300xl switches
running software release E.10.xx or greater, and 4200vl
switches.
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 15-64.
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