AOS-W 6.5.3.x | User Guide Increasing Network Uptime Through Redundancy and VRRP | 633
Chapter 23
Increasing Network Uptime Through Redundancy and VRRP
A single switch at the core of a network can represent a single point of failure. AOS-W high availability and
Virtual Router Redundancy Protocol (VRRP) redundancy features allow network administrators to significantly
reduce network downtime and client traffic disruption during network upgrades or unexpected failures.
High Availability
When you enable the High Availability WLAN redundancy solution, campus APs that lose contact with their
active switch do not need to re-bootstrap when they failover to the standby switch,significantly reducing AP
downtime. APs using the High Availability features regularly communicate with the standby switch so the
switch has a light workload to process in the event of an AP failover. This results in very rapid failover times and
a shorter client reconnect period. Therefore, High Availability is usually preferable to other redundancy
solutions (like a backup-LMS) that can put a heavy load on the backup switchduring failover, which results in
slower failover performance.
High Availability supports failover for campus APs using tunnel, decrypt-tunnel, or bridge forwarding modes. It
does not support failover for remote APs.
AP Fast Failover on bridge forwarding mode virtual AP is supported only on the OAW-4x50 Series switches.
For more information on HA Alerting, See High Availability Alerting on page 640
Pre-Deployment Information
For information to help you plan your high availability solution, refer to the following sections of this
document:
n High Availability Deployment Models on page 634
n High Availability Extended Switch Capacity on page 637
n Client State Synchronization on page 636
n High Availability Inter-Switch Heartbeats on page 637
Configuration Procedures
For more information on configuring the high availability feature, refer to the following sections of this
document:
n Configuring High Availability on page 638
n Migrating from VRRP or Backup-LMS Redundancy on page 641
VRRP-Based Redundancy
The Virtual Router Redundancy Protocol (VRRP) is used to create various redundancy solutions, including pairs
of local switches acting in an active-active mode or a hot-standby mode, or a master switch backing up a set of
local switches. The master switch owns the configured virtual IP address for the VRRP instance.
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