Flex Links Configuration
GigabitEthernet 1/0/2. Although GigabitEthernet 1/0/1 of Switch E is in the forwarding state, it
is still the slave port.
MMU-MAC address-table Move Update）message
When link switchover occurs in a Flex link group, the old forwarding entries are no longer
useful for the new topology. Therefore, all devices in the network need to refresh their MAC
address forwarding entries. Flex Link notifies devices to refresh their MAC address
forwarding entries by sending MMU messages to them.
32.1.2 Operating Mechanism of Flex Link
This section uses the network shown in Figure 32-2 to describe the Flex link mechanism
as the link status transiting from normal, to faulty, and then to recovery.
Figure 32-2 Flex Link application scenario
32.1.2.1 Link-Normal Operating
GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 of Switch A form a Flex link group, with
the former as the master port and the latter as the slave port. When both uplinks are healthy,
the master port is in the forwarding state, while the slave port is in the standby state, and the
links on which the two ports are seated respectively are called the primary link and the backup
link. In this case, data is transmitted along the link indicated by the blue line. There is no loop
in the network, hence no broadcast storms either.
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