Port Management
Link Aggregation
153 Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
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• Operational Advertisement—Displays the Administrative Advertisement status. The
LAG advertises its capabilities to its neighbor LAG to start the negotiation process. The
possible values are those specified in the Administrative Advertisement field.
• Administrative Flow Control—Set Flow Control to either Enable or Disable 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. See
the Port Configuration description in Port Settings for details regarding protected ports
and LAGs.
STEP 4 Click Apply. The Running Configuration file is updated.
LACP
A dynamic LAG is LACP-enabled, and LACP is run on every candidate port defined in the
LAG.
LACP Priority and Rules
LACP system priority and LACP port priority are both used to 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. Both the
local and remote switches have a LACP system priority.
The following algorithm is used to determine whether LACP port priorities are taken from the
local or remote device: the local LACP System Priority is compared to the remote LACP
System Priority. The device with the lowest priority controls candidate port selection to the
LAG. If both priorities are the same, the local and remote MAC addresses are compared. The
priority of the device with the lowest MAC address controls candidate port selection to the
LAG.
A dynamic LAG 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
the dynamic LAG, the device on the controlling end of the link uses port priorities to determine
which ports are bundled into the LAG and which ports are put in hot-standby mode. Port
priorities on the other device (the non-controlling end of the link) are ignored.
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