H3C Technologies H3C MSR 50 - Manual (Page 7)

1-6
y Figure 1-6 LWAPP dual link topolog
AC 2
AP 4 AP 1
AP 2 AP 3
AC 1
In the above figure, AC1 is working in master mode and providing services to AP1, AP2, AP3 and AP4.
AC2 is working in slave mode. APs are connected to AC2 through LWAPP slave tunnels. AC1 and AC2
can be configured as backup for each other and should start master/slave detection. When AC2 detects
AC1 is down, AC2 will convert the work mode from slave to master. All APs which are connected to AC2
through slave tunnels will transform the tunnels to master tunnels and use AC2 as the master AC. Once
AC 1 is reachable again, it will remain the backup.
Primary AC recovery
Figure 1-7 Primary AC recovery
AC 1 AC 2
AP
Primary AC
In the above figure, AC 1 acting as the primary AC is the master (which has the connection priority of 7),
and it establishes a CAPWAP connection with the AP; AC 2 acts as the slave AC. If AC 1 goes down,
AC 2 will act as the master until recovery of the CAPWAP. This means once AC 1 is reachable again,
the AP will establish a connection with AC 1 acting as the primary AC and disconnect from AC 2.