Chapter 25

VRRP

The underlying mechanism for the Dell redundancy solution is the Virtual Router Redundancy Protocol (VRRP). VRRP is used to create various redundancy solutions, including:

•pairs of local Dell controllers acting in an active-active mode or a hot-standby mode.

•a master controller backing up a set of local Dell controllers.

•a pair of Dell controllers acting as a redundant pair of master Dell controllers in a hot-standby mode.

VRRP eliminates a single point of failure by providing an election mechanism, among the Dell controllers, to elect a VRRP “master”controller. If VRRP preemption is disabled (the default setting) and all Dell controllers share the same priority, the first controller that comes up becomes the master. However, if VRRP preemption is enabled and all Dell controllers share the same priority, the controller with the highest IP address becomes the master.

The master controller owns the configured virtual IP address for the VRRP instance. When the master controller becomes unavailable, a backup controller steps in as the master and takes ownership of the virtual IP address. All network elements (APs and other Dell controllers) can be configured to access the virtual IP address, thereby providing a transparent redundant solution to your network.

Configuring Redundancy Parameters

Depending on your redundancy solution, you configure the VRRP parameters listed in Table 140 on your master and local Dell controllers.

Table 140: VRRP Parameters

Parameter

Description

Virtual Router ID

This uniquely identifies this VRRP instance. For ease in administration, you should

 

configure this with the same value as the VLAN ID.

 

 

Advertisement Interval

This is the interval, in seconds, between successive VRRP advertisements sent by the

 

current master. The default interval time is recommended.

 

Default: 1 second

 

 

Authentication Password

This is an optional password, of up to eight characters, that can be used to authenticate

 

VRRP peers in their advertisements. If this is not configured, there is no authentication

 

password set.

 

 

Description

This is an optional text description to describe the VRRP instance.

 

 

IP Address

This is the virtual IP address that will be owned by the elected VRRP master.

 

 

Enable Router Pre-emption

Selecting this option means that a controller can take over the role of master if it detects a

 

lower priority controller currently acting as master.

 

 

Delay

Specifying a value enables the delay timer. The timer is triggered when the VRRP state

 

moves out of backup or init state to become a master. This is applicable only if router pre-

 

 

Dell PowerConnect W-Series ArubaOS 6.2 User Guide

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Dell 6.2 manual Configuring Redundancy Parameters
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6.2 specifications

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