3Com 10014298 Creating or Deleting a Vlan, Specifying the Broadcast Suppression Ratio for a Vlan

54CHAPTER 3: VLAN CONFIGURATION

Common VLAN Configuration Tasks

The following sections discuss the common tasks for configuring a VLAN:

■Creating or Deleting a VLAN

■Specifying the Broadcast Suppression Ratio for a VLAN

■Setting or Deleting the VLAN Description Character String

■Specifying or Removing VLAN Interfaces

■Shutting Down or Enabling a VLAN Interface

■Displaying and Debugging a VLAN

Creating or Deleting a VLAN

Use the following command to create or delete a VLAN.

Perform the following configurations in system view.

Table 46 Creating or Deleting a VLAN

Operation	Command
Create and enter a VLAN view	vlan vlan_id
Delete the specified VLAN	undo vlan vlan_id

The command creates the VLAN first then enters the VLAN view. If the VLAN already exists, the command enters the VLAN view directly.

Note that the default VLAN, VLAN 1, cannot be deleted.

Specifying the Broadcast Suppression Ratio for a VLAN

You can use the following command to specify the broadcast suppression ratio for the VLAN.

Perform the following configuration in VLAN view.

Table 47 Setting the Broadcast Suppression Ratio for VLAN

Operation	Command
Specify the broadcast	broadcast-suppression max-ratio
suppression ratio for the
VLAN.
Restore the default broadcast	undo broadcast-suppression
suppression ratio for the
VLAN.

Using this command, you can set the threshold for broadcast traffic that can pass through the VLAN. This value is represented by the following ratio format: broadcast traffic/the entire traffic passed this VLAN. The system discards the traffic that exceeds the threshold to limit broadcast traffic and maintain the normal operation of network services.

The lower the value of the max-ratioparameter, the lower the volume of broadcast traffic that is allowed to pass through. By default, max-ratiois set to 100 and broadcast suppression is not performed on the specified VLAN.

Note that you cannot use this command on a port on the 20-port 10/100/1000BASE-T or 20-port 1000BASE-X-SFP I/O modules