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Configuring the Switch
3-184
3
Command Attributes
• Admin Status – Enables LLDP message transmit and receive modes for LLDP
Protocol Data Units. (Options: Tx only, Rx only, TxRx, Disabled; Default: TxRx)
• SNMP Notification – Enables the transmission of SNMP trap notifications about
LLDP and LLDP-MED changes. (Default: Enabled)
This option sends out SNMP trap notifications to designated target stations at the
interval specified by the Notification Interval in the preceding section. Trap
notifications include information about state changes in the LLDP MIB (IEEE
802.1AB), the LLDP-MED MIB (ANSI/TIA-1057), or vendor-specific
LLDP-EXT-DOT1 and LLDP-EXT-DOT3 MIBs.
For information on defining SNMP trap destinations, see “Specifying Trap
Managers and Trap Types” on page 3-40.
Information about additional changes in LLDP neighbors that occur between
SNMP notifications is not transmitted. Only state changes that exist at the time of
a trap notification are included in the transmission. An SNMP agent should
therefore periodically check the value of lldpStatsRemTableLastChangeTime to
detect any lldpRemTablesChange notification-events missed due to throttling or
transmission loss.
• TLV Type – Configures the information included in the TLV field of advertised
messages.
- Port Description – The port description is taken from the ifDescr object in
RFC 2863, which includes information about the manufacturer, the product
name, and the version of the interface hardware/software.
- System Description – The system description is taken from the sysDescr
object in RFC 3418, which includes the full name and version identification of the
system's hardware type, software operating system, and networking software.
- Management Address – The management address protocol packet includes
the IPv4 address of the switch. If no management address is available, the
address should be the MAC address for the CPU or for the port sending this
advertisement.
The management address TLV may also include information about the specific
interface associated with this address, and an object identifier indicating the type
of hardware component or protocol entity associated with this address. The
interface number and OID are included to assist SNMP applications in the
performance of network discovery by indicating enterprise specific or other
starting points for the search, such as the Interface or Entity MIB.
Since there are typically a number of different addresses associated with a
Layer 3 device, an individual LLDP PDU may contain more than one
management address TLV.
Every management address TLV that reports an address that is accessible on a
port and protocol VLAN through the particular port should be accompanied by a
port and protocol VLAN TLV that indicates the VLAN identifier (VID) associated
with the management address reported by this TLV.
- System Name – The system name is taken from the sysName object in
RFC 3418, which contains the system’s administratively assigned name. To