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However, before making connections between switches, pay attention to:
w The ports at both ends of a Port Aggregation connection must be configured as
Aggregation Ports.
w The ports at both ends of a Port Aggregation connection must have the same port
properties, including Speed, Duplex mode.
w All the ports of a Port Aggregation must be treated as an integer when added
to/deleted from a VLAN.
w Spanning Tree Algorithm (STA) treats all the ports of a Port Aggregation as an
integer.
w Before connecting cables between switches, enable the Pot Aggregation to avoid
looping.
w Before disabling Port Aggregation, remove the connecting cables between switches
to avoid looping.
w Both two slide-in slots should use the identical modules (two coppers/two fibers)
otherwise the Port Aggregation connection is invalid.
4.12 STA
The Spanning Tree Algorithm (STA) outlined in IEEE 802.1D can avoid network looping
but coexist with linking backup. This feature permits STA-aware switches interact with
each other. This can ensure only one route exists between any two devices on the
network. If looping is detected (maybe implements on purpose for linking backup), looping
ports will be blocked to discard additional route. If one using route fails, this Spanning
Tree Algorithm automatically releases the blocking port and establishes connection with
other devices.
Since a STA network has been established, all devices listen for Hello BPDUs (Bridge
Protocol Data Units) sent from the Root Bridge. After the Max Age maximum time is up,
the device supposes that the route to the Root Bridge is down. The devices initiate
negotiations with each other to reconfigure the network for a valid topology.
Root Device
Designated PortDesignated Port
Root PortRoot Port
Root PortRoot Port
Root Port
Designated PortDesignated Port
Blocking Route