HP 5500 Ei 5500 Si Switch Series Configuration Guide

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Table 12 DLDP mode and neighbor entry aging 
DLDP mode  Detecting a neighbor 
after the corresponding 
nei
ghbor entry ages out 
Removing the neighbor 
entry immediately after the 
Entr
y timer expires  
Triggering the Enhanced 
timer after an Entry timer 
ex
pires 
Normal DLDP 
mode 
No Yes  No 
Enhanced 
DLDP mode Yes No  Yes 
 
Tabl e  13
 shows the relationship between DLDP modes and unidirectional link types.  
Table 13  DLDP mode and unidirectional link types 
Unidirectional 
link type...

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•  Non-authentication: 
{ The sending side sets the Authentication field an d the Authentication type field of DLDP packets 
to 0.  
{  The receiving side checks the values of the two  fields of received DLDP packets and drops the 
packets where the two fields conflict with the corresponding local configuration. 
•   Simple authentication: 
{ Before sending a DLDP packet, the sending side sets the Authentication field to the 
user-configured password and sets the Authentication type field to 1.  
{...

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Table 15 Procedures for processing different types of DLDP packets received 
Packet t
ype Processing procedure 
Advertisement 
packet with RSY tag  Retrieves the 
neighbor 
information  If the corresponding neighbor en
try does not exist, creates the 
neighbor entry, triggers the Entry timer, and transits to Probe 
state. 
If the corresponding neighbor entry already exists, resets the 
Entry timer and transits to Probe state. 
Normal 
Advertisement 
packet  Retrieves the 
neighbor 
information  If...

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Packet type Processing procedure 
LinkDown packet Checks whether the 
local port operates 
in Enhanced mode  If not, performs no processing. 
If yes and the local port is not in
 Disable state, sets the state of 
the corresponding neighbor to un idirectional, and then checks 
the state of other neighbors. If all the neighbors are 
unidirectional, transitions the loca l port to the Disable state. If 
the state of some neighbors is unknown, waits until the state of 
these neighbors is determined. If...

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Table 17 Description on DLDP neighbor states 
DLDP nei
ghbor state  Description 
Unknown  A neighbor is in this state when it is just detected and is being probed. A neighbor is 
in this state only when it is being probed. It transits to Two way state or Unidirectional 
state after the probe operation finishes.  
Two way 
A neighbor is in this state after it receives response from its peer. This state indicates 
the link is a two-way link.  
Unidirectional A neighbor is in this state when the link...

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Enabling DLDP 
To properly configure DLDP on the device, first enable DLDP globally, and then enable it on each port.  
To enable DLDP:  
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enable DLDP globally. 
dldp enable  Globally disabled by default. 
3.  Enter Layer 2 Ethernet 
interface view or port group 
view.  Enter Layer 2 Ethernet  
interface view: 
interface
 interface-type 
interface-number  
Enter port group view: 
port-group manual  
port-group-name  Use either...

 44 
To set the interval to send Advertisement packets:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Set the interval to send 
Advertisement packets.  dldp interval
 time  Optional. 
5 seconds by default. 
 
 
NOTE:  
•  The interval for sending Advertisement packets applies to all DLDP-enabled ports. 
•   To enable DLDP to operate properly, make sure the intervals for sending Advertisement packets on both
sides of a link are the same. 
 
Setting the delaydown timer 
On some...

 45 
If the device is busy, or the CPU usage is high, normal links may be treated as unidirectional links. In this 
case, you can set the port shutdown mode to manual mode to alleviate the impact caused by false 
unidirectional link report. 
To set port shutdown mode: 
 
Step Command Remarks 
1.   Enter system view.  system-view  N/A 
2.  Set port shutdown 
mode.  dldp unidirectional-shutdown
 { auto | 
manual  }  Optional. 
auto
 by default. 
 
Configuring DLDP authentication 
You can guard your network...

 46 
Step Command 
1.  Enter system view.  system-view 
2.  Reset DLDP state. 
dldp reset 
 
Resetting DLDP state in interface view/port group view 
Resetting DLDP state in interface view or port group view  applies to the current port or all ports in the port 
group. 
To reset DLDP state in interface view/port group view: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter Layer 2 Ethernet 
interface view or port group 
view.  Enter Layer 2 Ethernet interface 
view: 
interface...

 47 
Figure 11 Network diagram 
 
 
Configuration procedure 
1. Configure Device A: 
# Enable DLDP globally. 
 system-view 
[DeviceA] dldp enable 
# Configure GigabitEthernet 1/0/49 to operate  in full duplex mode and at 1000 Mbps, and 
enable DLDP on the port. 
[DeviceA] interface gigabitethernet 1/0/49 
[DeviceA-GigabitEthernet1/0/49] duplex full 
[DeviceA-GigabitEthernet1/0/49] speed 1000 
[DeviceA-GigabitEthernet1/0/49] dldp enable 
[DeviceA-GigabitEthernet1/0/49] quit 
# Configure GigabitEthernet...