3Com 4500 Configuration Manual page 486

Enabling NDP globally and on specific ports
Configuring NDP-related parameters
Enabling NTDP globally and on a specific port
Configuring NTDP-related parameters
Enabling the cluster function
Configuring cluster parameters
Configuring inside-outside interaction for a
cluster
Configuring the network management interface
for a cluster
Enabling management VLAN synchronization
To reduce the risk of being attacked by malicious users against opened socket and enhance switch
security, the Switch 4500 series Ethernet switches provide the following functions, so that a cluster
socket is opened only when it is needed:
Opening UDP port 40000 (used for cluster) only when the cluster function is implemented,
Closing UDP port 40000 at the same time when the cluster function is closed.
On the management device, the preceding functions are implemented as follows:
When you create a cluster by using the build or auto-build command, UDP port 40000 is opened
at the same time.
When you remove a cluster by using the undo build or undo cluster enable command, UDP port
40000 is closed at the same time.
Enabling NDP globally and on specific ports
Follow these steps to enable NDP globally and on specific ports:
To do...
Enter system view
Enable NDP globally
In system view
Enable NDP
on specified
In
Ethernet
Ethernet
ports
port view
Task
Enter Ethernet
port view
Enable NDP on
the port
1-10
Remarks
Required
Optional
Required
Optional
Required
Required
Optional
Optional
Optional
Use the command...
system-view
ndp enable
ndp enable interface
port-list
interface interface-type
interface-number
ndp enable
Remarks
—
Required
By default, NDP is
enabled globally.
Use either approach.
By default, NDP is
enabled on a port.