Dell 6.2 manual Configuring the Local Controller for Redundancy

Parameter	Description
	emption is enabled.
	When the timer is triggered, it forces VRRP to wait for a specified period of time, so that all
	the applications are ready before coming up. This prevents the APs from connecting to the
	controller before it can receive them. In the mean time, if there is an advertisement from
	another VRRP, the VRRP stops the timer and does not transition to master.
Priority	Priority level of the VRRP instance for the controller. This value is used in the election
	mechanism for the master.
Tracking	Configures a tracking mechanism that modifies a specified value to the priority after a
	controller has been the master for the VRRP instance. This mechanism is used to avoid
	failing over to a backup Master for transient failures.
	Tracking can be based on one of the following:
	• Master Up Time: how long the controller has been the master. The value of duration is
	the length of time that the administrator expects will be long enough that the database
	gathered in the time is too important to be lost. This will obviously vary from instance to
	instance.
	• VRRP Master State Priority: the master state of another VRRP.
	Tracking can also be based on the interface states of the controller:
	• VLAN and Interface: prevents asymmetric routing by tracking multiple VRRP instances.
	The priority of the VRRP interface determined by the sub value can increase or
	decrease based on the operational and transitional states of the specified VLAN or Fast
	Ethernet/Gigabit Ethernet port. When the VLAN or interface comes up again, the value
	is restored to the previous priority level. You can track a combined maximum of 16
	interfaces and VLANs.
	For example, you can track an interface that connects to a default gateway. In this situation,
	configure the VRRP priority to decrease and trigger a VRRP master re-election if the
	interface goes down. This not only prevents network traffic from being forwarded, but
	reduces VRRP processing.
Admin State	Administrative state of the VRRP instance. To start the VRRP instance, change the admin
	state to UP in the WebUI.

VLAN

VLAN on which the VRRP protocol will run.

Configuring the Local Controller for Redundancy

In a Dell network, the APs are controlled by a controller. The APs tunnel all data to the controller which processes the data, including encryption/decryption, bridging/forwarding, etc.

Local controller redundancy refers to providing redundancy for a controller such that the APs “fail over” to a backup controller if a controller becomes unavailable. Local controller redundancy is provided by running VRRP between a pair of Dell controllers.

NOTE: The two Dell controllers need to be connected on the same broadcast domain (or Layer-2 connected) for VRRP operation. The two Dell controllers should be of the same class (for example, and both Dell controllers should be running the same version of ArubaOS.

The APs are then configured to connect to the “virtual-IP”configured for the VRRP instance.

Collect the following information needed to configure local controller redundancy:

•VLAN ID on the two local Dell controllers that are on the same Layer-2 network and is used to configure VRRP.

•Virtual IP address to be used for the VRRP instance.

You can use either the WebUI or CLI to configure VRRP on the local Dell controllers. For this topology, it is recommended to use the default priority value.

478 VRRP Dell PowerConnect W-Series ArubaOS 6.2 User Guide