3com S7906E Instruccion De Instalación

 

1-7 

If the corresponding neighbor entry does not exist, 
creates the neighbor entry, triggers the Entry timer, and 
transits to Probe state. 

If the neighbor information it carries 
conflicts with the corresponding locally 
maintained neighbor entry, drops the 
packet. 

Echo packet 

Retrieves the 
neighbor information.

The 
correspondi
ng neighbor 
entry 
already 
exists 

Otherwise, sets the flag of the neighbor as 
two-way connected. In addition, if the 
flags of all the neighbors are two-way 
connected, the device transits from Probe 
state to Advertisement state and disables 
the Echo timer. 

If yes, no process is performed. 

Disable packet  

Check to see if the 
local port is in 
Disable state. 

If not, the local port transits to Disable state. 

If not, no process is performed. 

RecoverProbe 
packet 

Check to see if the 
local port is in 
Disable or 
Advertisement state.

If yes, returns RecoverEcho packets. 

If not, no process is performed. 

RecoverEcho 
packet 

Check to see if the 
local port is in 
Disable state. 

If yes, the local port transits to Active state if the neighbor 
information the packet carries is consistent with the local 
port information. 

If not, no process is performed. 

LinkDown 
packet 

Check to see if the 
local port operates in 
Enhanced mode. 

If yes and the local port is not in Disable state, the local 
transits to Disable state. 

 

3)  If no echo packet is received from the neighbor, DLDP performs the following processing. 

Table 1-6 Processing procedure when no echo packet is received from the neighbor 

In normal mode, no echo packet is 
received when the Echo timer expires. 

In enhanced mode, no echo packet is 
received when the enhanced timer expires.

DLDP transits to the Disable state, outputs log and 
tracking information, and sends Disable packets. In 
addition, depending on the user-defined DLDP down 
mode, DLDP shuts down the local port or prompts 
users to shut down the port, and removes the 
corresponding neighbor entry. 

 

If the port shutdown mode upon detection of a unidirectional link is set to auto, DLDP sets the state of 

the port where a unidirectional link is detected to DLDP down automatically. A DLDP down port cannot 

forward service traffic or send/receive any PDUs except DLDPDUs. 

On a DLDP down port, DLDP monitors the unidirectional link. Once DLDP finds out that the state of the 

link has restored to bidirectional, it brings up the port. The specific process is as follows: 

The DLDP down port sends out a RecoverProbe packet, which carries only information about the local 

port, every two seconds. Upon receiving the RecoverProbe packet, the remote end returns a