Context
A VLAN pool is a combination of multiple VLANs and is used to simplify network deployment. The administrator plans the VLANs of users in a department as a VLAN pool. After a user passes the authentication, the authentication server authorizes the VLAN pool to the user. The device allocates VLANs in the VLAN pool to users based on the VLAN assignment algorithm. In this way, VLANs can be planned for multiple departments without the need of calculating the number of users of each department.
Procedure
- Create a VLAN pool.
- Click Create. The Create VLAN Pool dialog box is displayed.
Table 1 describes parameters on the page.
Table 1 Create a VLAN pool Parameter
Description
VLAN Pool name
Specifies the name of a VLAN pool.
VLAN assignment mode
Specifies the VLAN assignment algorithm in the VLAN pool to Hash or Even.- When the VLAN assignment algorithm is set to Hash, VLANs are assigned to users from the VLAN pool based on the hash result of their MAC addresses. As long as the VLANs in the VLAN pool do not change, the users obtain fixed VLAN. A user is preferentially assigned the same IP address when going online at different times.
- When the VLAN assignment algorithm is set to Even, service VLANs are assigned to users from the VLAN pool based on the order in which users go online. Address pools mapping the service VLANs evenly assign IP addresses to users. If a user goes online many times, it obtains different IP addresses.
VLAN ID
Indicates that the specified VLAN is added to the VLAN Pool.
NOTE:This parameter can be configured only after you click
and add a VLAN ID to the data area below. Or you can click 
to clear the data in the text box.Detection period (min)
Specifies the interval at which the VLAN pool module receives a notification from the DHCP module, indicating that users fail to obtain IP addresses from the IP address pool for a specific VLAN.
Number of address allocation failures
Specifies the number of times that the VLAN pool module receives a notification from the DHCP module, indicating that users fail to obtain IP addresses from the IP address pool for a specific VLAN.
- Click Create. The Create VLAN Pool dialog box is displayed.
- Modify a VLAN pool.
- Choose .
- Click the name of the VLAN pool in the VLAN pool list. The Modify VLAN Pool page is displayed, as shown in Table 1.
- Modify the parameters.
- Click OK.
- Delete a VLAN pool.
- Choose .
- Select the VLAN pool to be deleted and click Delete. The system asks you whether to delete the VLAN pool.
- Click OK.
- Refresh VLAN pools.
- Choose .
- Click Refresh.