Port Management
Configuring LACP
Cisco Small Business 300 Series Managed Switch Administration Guide 95
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• Administrative Flow Control—Enable or disable Flow Control or enable the
auto-negotiation of Flow Control on the LAG.
• Operational Flow Control—Displays the current Flow Control setting.
• Protected LAG—Select to make the LAG a protected port for Layer 2
isolation. The Port Configuration description in the Port Management
Workflow section for details regarding protected ports and LAGs.
STEP 4 Click Apply. The switch is updated.
You can select another LAG for configuration by changing the LAG field.
Configuring LACP
A dynamic LAG is LACP-enabled; the Link Aggregation Control Protocol is run on
every candidate port defined in the LAG.
LACP system priority and LACP port priority determine which of the candidate
ports become active member ports in a dynamic LAG configured with more than
eight candidate ports. The selected candidate ports of the LAG are all connected
to the same remote device.
An LACP channel group can have up to 16 Ethernet ports of the same type. Up to
eight ports can be active, and up to eight ports can be in standby mode. When
there are more than eight ports in an LACP channel-group, the switch on the
controlling end of the link uses port priorities to determine which ports are
bundled into the channel and which ports are put in hot-standby mode. Port
priorities on the other switch (the non-controlling end of the link) are ignored.
The LACP priority is taken either from the local or the remote device according to
the following rule: The local LACP System Priority is compared to the remote
LACP System Priority device. The lowest priority is used. If both priorities are the
same, the local and remote MAC addresses are compared. The priority of the
device with the lowest MAC address is used.
The additional rules in selecting the active or standby ports in a dynamic LACP are
as follows:
• Any link operating at a different speed from the highest-speed active
member or operating at half-duplex is made standby. All the active ports in
a dynamic LAG operate at the same baud rate.
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