Information Technology Reference
In-Depth Information
Primary WLC for
AP1 and AP2
AP1
AP2
Secondary
WLC
AP3
Primary WLC for
AP3 and AP4
AP4
Figure 5-13
N+1 Controller Redundancy
N+N WLC Redundancy
With N+N redundancy, shown in Figure 5-14, an equal number of controllers back up
each other. For example, a pair of WLCs on one floor serves as a backup to a second pair
on another floor. The top WLC is primary for AP1 and AP2 and secondary for AP3 and
AP4. The bottom WLC is primary for AP3 and AP4 and secondary for AP1 and AP2.
There should be enough capacity on each controller to manage a failover situation.
Primary WLC for
AP1 and AP2.
Secondary WLC
for
AP3 and AP4.
AP1
AP2
AP3
Primary WLC for
AP3 and AP4.
Secondary WLC
for
AP1 and AP2.
AP4
Figure 5-14
N+N Controller Redundancy
N+N+1 WLC Redundancy
With N+N+1 redundancy, shown in Figure 5-15, an equal number of controllers back up
each other (as with N+N), plus a backup WLC is configured as the tertiary WLC for the
APs. N+N+1 redundancy functions the same as N+N redundancy plus a tertiary controller
network operations center.
