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Primary ac recovery – H3C Technologies H3C WX3000E Series Wireless Switches User Manual

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and the subordinate AC acts as the backup AC. If the master AC fails, APs should quickly use the services

provided by the subordinate AC. A heartbeat mechanism is used between these two ACs, which ensures
that failure of the master will be detected quickly by the backup AC.

Figure 6 Dual link topology

In

Figure 6

, AC 1 is working in master mode and providing services to AP 1, AP 2, AP 3 and AP 4. AC

2 is working in subordinate mode. APs are connected to AC 2 through subordinate tunnels. AC 1 and

AC 2 can be configured as backup for each other and start master/subordinate detection. When AC 2

detects AC 1 is down, AC 2 quickly converts the work mode from subordinate to master. All APs which

are connected to AC 2 through subordinate tunnels transform the tunnels to master tunnels and use AC
2 as the master AC. Once AC 1 is reachable again, it remains the backup.

Primary AC recovery

Figure 7 Primary AC recovery

In

Figure 7

, AC 1 acting as the primary AC is the master (which has the connection priority of 7), and it

establishes an AC-AP tunnel connection with the AP; AC 2 acts as the subordinate AC. If AC 1 goes

down, AC 2 will act as the master until recovery of the AC-AP tunnel. This means once AC 1 is reachable

AC 2

AP 4

AP 1

AP 2

AP 3

AC 1

AC 1

AC 2

AP

Primary AC