Alcatel-Lucent AOS-W 6.5.3.x - Page 635

Figure 80 1:1 Active/Standby Deployment
N:1 Active/Standby Deployment Model
In this model, the active switch supports up to 100% of its rated AP capacity, while the other switch is idle in
standby mode. If an active switch fails, all APs served by the active switch failover to the standby switch. This
model requires that the AP capacity of the standby switch is able to support the total number of APs
distributed across all active switches in the cluster.
In the cluster shown in the example below, the standby switch has enough APcapacity to support the total
number of APs terminating at the active switches ( Switch 1 and Switch 2).
Figure 81 1:1 Active/Standby Deployment
Master-Redundancy Deployment Model
AOS-W supports VRRP-based LMS redundancy in a deployment with master-master redundancy. In the
topology below, when an AP connects to the master switch (M1), the AP receives a standby IP, which it uses to
establish a standby connection to the backup master (M2). If the active master becomes unreachable or
reboots, the backup master changes its VRRP role to master and accepts active AP connections.
When M1 comes back up, it initially acts as a backup master, and APs associated to M2 establish a standby
connection to M1. When the switches change roles and M1 becomes the active master once again, M2 forces
the APs to use M1 as their active master. If an AP has not established a connection to M1 before it
disassociates from M2, the AP rebootstraps before it reconnects back to M1.
AOS-W 6.5.3.x | User Guide Increasing Network Uptime Through Redundancy and VRRP | 635