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2.9
LLDP function
LLDP (Link Layer Discovery Protocol) is an adjacent search protocol which aims at the understanding of the adjacent device
and the confirmation of the connection state etc by the publicity of the information of device itself.
LLDP information is delivered only to the device connected to the same physical LAN. It does not deliver before crossing
the router.
The LLDP function of this device is based on IEEE802.1AB and, provides the following functions.
∙ Device information is transmitted by LLDP
∙ Adjacent device information received by LLDP is retained
∙ The information related to LLDP is managed as MIB and MIB is acquired by SNMP function
∙ The updated adjacent information is notified by SNMP trap
∙ LLDP setting information, device information, adjacent device information, statistical Information is displayed.
The following information is included in the LLDP information transmitted from this device. It can be instructed so as not
to transmit Option information. In addition, do not transmit unnecessary option information since information above 1500
bytes cannot be transmitted. Especially note that, if it exceeds 1500 bytes while using CEE function, the information
necessary for CEE operation will not be transmitted. The content to be actually transmitted can be checked by command or
the Web screen.
∙ Device identification information (Representative MAC address) (essential)
∙ Physical port identification information (ifIndex MIB) （essential）
∙ Retention time information (TTL) （essential）
∙ Physical port explanatory information (ifDescr MIB) (Option)
∙ Device name information (sysName MIB) （Option）
∙ Device explanatory information (sysDescr MIB) （Option）
∙ Device major function information (switch/router) （Option）
∙ Physical port management address information (MAC/IPv4/IPv6) （Option）
∙ Port VLAN ID information（Option）
∙ Protocol VLAN ID information（Option）
∙ VLAN name information（Option）
∙ Protocol VLAN type information（Option）
∙ Physical port setting information（Option）
∙ Physical port power supply information（Option）
∙ Link aggregation information（Option）
∙ Maximum frame size information（Option）
The LLDP information received from the adjacent device is retained until the retention time included in LLDP
information passes. The information being retained can be checked by command or the Web screen.
The maximum number of adjacent information which can be retained in this device is shown below. The information
that cannot be retained due to exceeded maximum retention count is destroyed. The destroyed information is
counted in statistical data
Maximum retention count in the entire device
Minimum security retention count in 1 port
Shared retention count in the entire device.
Maximum retention count in 1 port ()
) When all the shared parts are retained by 1 port (Only 1 can be retained in other ports)
Condition
Retention count
510
1
476
477
Page 21 of 71
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