3Com Switch 7750 Configuration Guide

222 CHAPTER 27: DLDP CONFIGURATION
For XGbus products, pay attention to the following points:
■ When interface modules are hot swapped, if the plugged interface module is
of the same type as the pulled interface module, DLDP restores automatically.
■ When active/standby switchover is performed on an Fabric, the standby Fabric
detects unidirectional links instead of the Fabric. DLDP parameters remain the
same and unidirectional links are detected again on each port.
DLDP Network
Example
Network requirements
As shown in Figure 57:
■ Switch A and Switch B are connected through two pairs of fibers. Both of them
support DLDP;
■ Suppose the fibers between Switch A and Switch B are cross-connected. DLDP
disconnects the unidirectional links after detecting them;
■ When the network administrator connects the fiber correctly, the ports taken
down by DLDP are restored.
Network diagram
Figure 57 Fiber cross-connection
Configuration procedure
1 Configure Switch A
# Configure the ports to work in mandatory full duplex mode at the speed of
1000 Mbps.
<SW7750A> system-view
[SW7750A] interface gigabitethernet 2/0/3
[SW7750A-GigabitEthernet2/0/3] duplex full
[SW7750A-GigabitEthernet2/0/3] speed 1000
[SW7750A-GigabitEthernet2/0/3] quit
[SW7750A] interface gigabitethernet 2/0/4
[SW7750A-GigabitEthernet2/0/4] duplex full
[SW7750A-GigabitEthernet2/0/4] speed 1000
[SW7750A-GigabitEthernet2/0/4] quit
# Enable DLDP globally
[SW7750A] dldp enable
SwitchB
SwitchA
PC
GE2/0/3
GE2/0/3
GE2/0/4
GE2/0/4
SwitchB
SwitchA
PC
GE2/0/3
GE2/0/3
GE2/0/4
GE2/0/4