(Supporting ADX v03.1.00) Owner manual

306 Brocade Virtual ADX Server Load Balancing Guide
53-1003247-01
Overview
6
Hot Standby HA protocol operations
Figure 35 illustrates a typical Hot Standby HA configuration.
FIGURE 35 Typical Hot Standby HA
When Brocade Virtual ADX-A initializes in a Hot Standby HA configuration, it is in the standby state.
When it sends Hello messages and no other Brocade Virtual ADX responds to these messages,
Brocade Virtual ADX-A sets itself to the active state. When Brocade Virtual ADX-B initializes, it also
goes through Hello-message processing. When Brocade Virtual ADX-B sends Hello messages,
Brocade Virtual ADX-A responds with an Active status. When Brocade Virtual ADX-B receives this
status, it assumes the Standby status. Then Brocade Virtual ADX-A in the active state performs the
following four stages of synchronization:
• Port map synchronization
• MAC table synchronization
• Server information synchronization
• Session synchronization