System Management
Basic System Configuration Guide 277
A TTL value of zero can be used, for example, to signal that the sending port has initiated a
port shutdown procedure.
The end of a LLDPDU TLV marks the end of the LLDPDU.
The IEEE 802.1ab standard defines a protocol that:
• Advertises connectivity and management information about the local station to
adjacent stations on the same IEEE 802 LAN.
• Receives network management information from adjacent stations on the same IEEE
802 LAN.
• Operates with all IEEE 802 access protocols and network media.
• Establishes a network management information schema and object definitions that
are suitable for storing connection information about adjacent stations.
• Provides compatibility with a number of MIBs as depicted in Figure 25.
Figure 25: LLDP Internal Architecture for a Network Node
Network operators must be able to discover the topology information in order to detect and
address network problems and inconsistencies in the configuration. Moreover, standard-
based tools can address the complex network scenarios where multiple devices from different
vendors are interconnected using Ethernet interfaces.
0981
LLDP local system MIB
Organizationally
defined local device
LLDP MIB extension
(optional)
Organizationally
defined remote device
LLDP MIB extensions
(optional)
LLDP remote systems MIB
PTOPO MIB
(optional)
Entity MIB
(optional)
Interface MIB
(optional)
Other MIBs
(optional)
LLDP frames
LLDP Agent
LLDP/LSAP
Remote device
information
Local device
information
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