- Nortel Ethernet Routing Switch Owner's Manual

76 System configuration software features
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port ID TLV
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Time to Live TLV
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End Of LLDPDU TLV
The chassis ID and the port ID values are concatenated to form a logical
MSAP identifier that is used by the recipient to identify the sending LLDP
agent and port.
A non-zero value in the Time to Live (TTL) field of the TTL TLV indicates
to the receiving LLDP agent how long the LLDPDU information from the
MSAP identifier remains valid. All LLDPDU information is automatically
discarded by the receiving LLDP agent if the sender fails to update it
in a timely manner. A zero value in TTL field of Time To Live TLV tells
the receiving LLDP agent to discard the information associated with the
LLDPDU MSAP identifier.
In addition to the four mandatory TLVs, Release 4.1 software supports the
basic management TLV set. You can specify which of these optional TLVs
to include in the transmitted LLDPDUs for each port.
The optional management TLVs are as follows:
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Port Description TLV
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System Name TLV
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System Description TLV
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System Capabilities TLV (indicates both the system supported
capabilities and enabled capabilities, such as end station, bridge, or
router)
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Management Address TLV
Transmitting LLDPDUs When a transmit cycle is initiated, the LLDP
manager extracts the managed objects from the LLDP local system MIB
and formats this information into TLVs. The TLVs are then inserted into
the LLDPDU.
LLDPDUs are regularly transmitted at a user-configurable transmit interval
(tx-delay), or when any of the variables contained in the LLPDU are
modified on the local system (such as system name or management
address). Tx-delay is the minimum delay between successive LLDP frame
transmissions.
TLV system MIBs The LLDP local system MIB stores the information for
constructing the various TLVs to be sent. The LLDP remote system MIB
stores the information received from remote LLDP agents.
Nortel Ethernet Routing Switch 2500 Series
Overview — System Configuration
NN47215-500 (323162-B) 02.02 Standard
4.1 19 November 2007
Copyright © 2007, Nortel Networks
.