H3C Technologies H3C S5120 Series Switches - Manual (Page 134)

1-10
By setting the TTL multiplier, you can configure the TTL of locally sent LLDPDUs, which determines how
long information about the local device can be saved on a neighbor device. The TTL is expressed as
follows:
TTL = Min (65535, (TTL multiplier × LLDPDU transmit interval))
As the expression shows, the TTL can be up to 65535 seconds. TTLs greater than 65535 will be
rounded down to 65535 seconds.
Follow these steps to change the TTL multiplier:
To do… Use the command… Remarks
Enter system view system-view —
Set the TTL multiplier lldp hold-multiplier value
Optional
4 by default.
Set the LLDPDU transmit
interval
lldp timer tx-interval interval
Optional
30 seconds by default
Set LLDPDU transmit delay lldp timer tx-delay delay
Optional
2 seconds by default
Set the number of LLDPDUs
sent each time fast LLDPDU
transmission is triggered
lldp fast-count count
Optional
3 by default
To ensure that the LLDP neighbors can receive LLDPDUs to update information about the current
device before it is aged out, configure both the LLDPDU transmit interval and delay to be less than the
TTL.
Setting an Encapsulation Format for LLDPDUs
LLDPDUs can be encapsulated in Ethernet II or SNAP frames.
z With Ethernet II encapsulation configured, an LLDP port sends LLDPDUs in Ethernet II frames and
only processes incoming, Ethernet II encapsulated LLDPDUs.
z With SNAP encapsulation configured, an LLDP port sends LLDPDUs in SNAP frames and only
processes incoming, SNAP encapsulated LLDPDUs.
By default, LLDPDUs are encapsulated in Ethernet II frames. If the neighbor devices encapsulate
LLDPDUs in SNAP frames, configure the encapsulation format for LLDPDUs as SNAP to guarantee
normal communication with the neighbors.
Follow these steps to set the encapsulation format for LLDPDUs to SNAP:
To do… Use the command… Remarks
Enter system view system-view —