Netgear XCM8806 Chassis User Manual - Page 155
Managing LLDP, You manage LLDP using the CLI and SNMP. See
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NETGEAR 8800 User Manual • Manufacturer name • Model name • Asset ID Managing LLDP LLDP is disabled by default. LLDP information is transmitted periodically and stored for a finite period. You access the information using SNMP. A port configured to receive LLDP messages can store information for up to four neighbors. You manage LLDP using the CLI and SNMP. (See NETGEAR 8800 Chassis Switch CLI Manual for complete information on configuring, managing, and displaying LLDP.) The LLDP MED TLVs begin transmission only after detecting LLDP MED TLVs transmitted by a neighbor. After you enable LLDP, you can set a variety of time periods for the transmission and storage of the LLDP messages (or you can use the default values), as follows: • Reinitialization period (default is 2 seconds) • Delay between LLDP transmissions (default is 2 seconds)-applies to triggered updates, or updates that are initiated by a change in the topology • Transmit interval (default is 30 seconds)-applies to messages sent periodically as part of protocol • Time-to-live (TTL) value (default is 2 minutes)-time that the information remains in the recipient's LLDP database Note: Once the LLDP MED TLVs begin transmitting (after detecting LLDP MED TLVs from a connected endpoint), those TLVs are also controlled by these timers. Each time a device receives an LLDP advertisement packet, the device stores the information and initializes a timer that is compared to the TTL value of the packet. If the timer reaches the TTL value, the LLDP agent deletes the stored information. This action ensures that only valid information is stored in the LLDP agent. After you enable LLDP, you can enable the LLDP-specific SNMP traps; the traps are disabled by default. After you enable the LLDP-specific traps, the systems send all LLDP traps to the configured trap receivers. You configure the period between the system sending SNMP notifications; the default interval is 5 seconds. LLDP configurations are saved across reboots when you issue the save configuration command. The system logs EMS messages regarding LLDP, including when optional TLVs exceeding the 1500-byte limit are dropped and more than 4 neighbors are detected on a port. When both IEEE 802.1x and LLDP are enabled on the same port, LLDP packets are not sent until one or more clients authenticate a port. Also, incoming LLDP packets are only accepted if one or more clients are authenticated. Chapter 6. LLDP | 155
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