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Figure 43 Network diagram for portal stateful failover configuration
As shown in Figure 43, users have to pass portal authentication to access the Internet. To avoid portal
service interruption caused by single point failures, you can deploy two access devices (Gateway A and
Gateway B) and configure the portal stateful failover function on them, so that they back up the portal
online user information of each other through the failover link. When one of them (Gateway A or
Gateway B) fails, the other can guarantee the normal data communication of the online portal users and
perform portal authentication for new portal users.
Basic concepts
1. Device states
• Independence: A stable running status of a device when it does not establish the failover link with
the other device.
• Synchronization: A stable running status of a device when it establishes the failover link with the
other device successfully and is ready for data backup.
2. User modes
• Stand-alone: Indicates that the user data is stored on the local device only. Currently, the local
device is in independence state or it is in synchronization state but has not synchronized the user
data to the peer device yet.
• Primary: Indicates that the user logs in from the local device, and the user data is generated on the
local device. The local device is in synchronization state and ready for receiving and processing
packets from the server.
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