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DellPowerConnectW-SeriesArubaOS6.2 | User Guide VRRP | 477
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:
l pairs of local Dell controllers acting in an active-active mode or a hot-standby mode.
l a master controller backing up a set of local Dell controllers.
l 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.
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-
Table 140:
VRRP Parameters