Optional TLVs

IEEE standard 802.1ab defines a set of optional TLVs, which are listed in the following table.

The system description TLV is advertised by default. All other optional TLVs must be configured to enable advertising. You can use the CLI to configure the optional TLVs, or you can use an SNMP-compatible network management system (NMS) such as Extreme Management Center or Ridgeline. For more information on the optional TLVs, see Configuring Optional TLV Advertisements.
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Optional TLVs

Name Comments

Port description

Advertises the display-string that is configured for the port.

System name

Advertises the device‘s configured system name, which is configured with the configure snmp sysname command.

System description

Advertises show version command information similar to the following:

 ExtremeXOS version 11.2.0.12 v1120b12 by release-manager 
on Fri Mar 18 16:01:08 PST 2005 

The default configuration advertises this optional TLV when LLDP is enabled.

System capabilities

Advertises bridge capabilities. If IP forwarding is enabled on at least one VLAN in the switch, the software also advertises router capabilities.

Management address

Advertises the IP address of the management VLAN in the management address TLV. If the management VLAN does not have an assigned IP address, the management address TLV advertises the system‘s MAC address.

VLAN name

Advertises the name of a tagged VLAN for the port. You can configure this TLV multiple times to support multiple VLANs.

Port VLAN ID

Advertises the untagged VLAN on the port.

Port and protocol VLAN ID

Advertises a VLAN and whether the port supports protocol-based VLANs or not. You can configure this TLV multiple times to support multiple VLANs.

MAC/PHY configuration/status

Advertises the autonegotiation and physical layer capabilities of the port.

Power via MDI

For Ethernet (PoE) or PoE+ ports, this TLV advertises the device type, power status, power class, and pin pairs used to supply power.

Link aggregation

Advertises information on the port‘s load-sharing (link aggregation) capabilities and status.

Maximum frame size

Advertises the maximum supported frame size for a port to its neighbors. When jumbo frames are not enabled on the specified port, the TLV advertises a value of 1518. If jumbo frames are enabled, the TLV advertises the configured value for the jumbo frames.