Configuring Lacp - Cisco Small Business 200 Series Administration Manual

Port Management
Link Aggregation
- 1000 Full—The LAG advertises a 1000 Mbps speed and the mode is full duplex.
- 10000 Full—The LAG advertises a 10000 Mbps speed and the mode is full duplex.
• 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.
STEP 4

Configuring 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.
The following are additional rules used to select the active or standby ports in a dynamic LACP:
• 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.
Cisco Small Business 200 Series Smart Switch Administration Guide
Click Apply. The Running Configuration file is updated.
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