Chapter 13
| Basic Administration Protocols
Link Layer Discovery Protocol
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◆ SNMP Notification – Enables the transmission of SNMP trap notifications
about LLDP and LLDP-MED changes. (Default: Disabled)
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” on page 403.
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.
◆ MED Notification – Enables the transmission of SNMP trap notifications about
LLDP-MED changes. (Default: Disabled)
◆ Basic Optional TLVs – Configures basic information included in the TLV field of
advertised messages.
■
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.
■
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.
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