Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 171
• Value is the actual information that needs to be sent; for example, a binary bit
map or an alphanumeric string that can contain one or more fields.
Each LLDPDU contains four mandatory TLVs and can contain optional TLVs as
selected by network management. Figure 23 shows the LLDPDU format.
Figure 23 LLDPDU Format
The chassis ID TLV identifies the chassis containing the Ethernet port responsible
for transmitting the LLDPDU. The port ID TLV identifies the Ethernet port responsible
for transmitting the LLDPDU. The chassis ID and the port ID values are concatenated
to form a logical identifier (the MSAP identifier) that is used by the recipient to identify
the sending LLDP agent and associated port. Both the chassis ID and port ID values
can be defined in a number of ways. Once selected, however, the chassis ID and port
ID value combination remains the same as long as the particular port remains
operable.
The Time To Live TLV indicates the number of seconds (from 0 to 65535) that the
receiving LLDP agent should consider the information contained in the received
LLDPDU to be valid. The Time To Live TLV is calculated by the formula tx-interval ×
tx-hold-multiplier. The associated information is automatically discarded by the
receiving LLDP agent if the sender fails to update it before this time. A zero value
indicates that any information pertaining to this LLDPDU identifier is to be discarded
immediately. 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 LLDPDU TLV marks the end of the LLDPDU.
DA SA FCSLLDPDUt:88-CC
Chassis
ID TLV
Optional
TLV
Optional
TLV
Port
ID TLV
Time to
Live TLV
End of
LLDPDU TLV
Mandatory Mandatory Mandatory Mandatory
. . .
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