3com S7906E Manuel De Montage

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Setting Other LLDP Parameters 
The TTL TLV carried in an LLDPDU determines how long the device information carried in the LLDPDU 
can be saved on a recipient device.  
You can configure the TTL of locally sent LLDP frames to determine how long information about the 
local device can be saved on a neighbor device by setting the TTL multiplier. 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 it 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 LLDP frames 
sent each time fast LLDPDU 
transmission is triggered.  
lldp fast-count count 
Optional 
3 by default 
 
 
The TTL can be up to 65535 seconds. TTLs greater than it will be rounded down to 65535 seconds.  
LLDPDU transmit delay must be less than the TTL to ensure that the LLDP neighbors can receive 
LLDP frames to update information about the device you are configuring before it is aged out.  
 
Setting an Encapsulation Format for LLDPDUs 
LLDPDUs can be encapsulated in Ethernet II or SNAP frames.  
With Ethernet II encapsulation configured, an LLDP port sends LLDPDUs in Ethernet II frames and 
processes an incoming LLDP frame only when it is Ethernet II encapsulated. 
With SNAP encapsulation configured, an LLDP port sends LLDPDUs in SNAP frames and 
processes an incoming LLDP frame only when it is SNAP encapsulated.  
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: