What is the master/slave switchover mechanism when two server IP addresses in primary/secondary mode are configured on an ME60 using the dhcp-server group command?
By default, the first server IP address is the primary IP address and services are automatically switched to the slave server when the master server becomes down.
The DHCP server down/up
mechanism is as follows:
(1) During user online, the ME60 sends a DHCP Discover or Request packet to the server. If no response is received within 25 seconds, the server is made down. A timer is enabled, and the server is made up again after 3 minutes.
(2) By default, the ME60 makes the server down if no response is received within the specified period.
After the dhcp-server dead-count command is run, the server is made down after reaching the accumulated account. If some users go online during the accumulation, the count of Offer or Ack packets is cleared.