Aggregating Ports
Cisco Small Business SFE/SGE Managed Switches Administration Guide 393
18
Aggregating Ports
Link Aggregated Groups (LAGs) optimize port usage by linking a group of ports
together to form a single aggregated group. Link aggregated groups multiply the
bandwidth between the devices, increase port flexibility, and provide link
redundancy.
The device supports both static LAGs and Link Aggregation Control Protocol
(LACP) LAGs. LACP LAGs negotiate aggregating port links with other LACP ports
located on a different device. If the other device ports are also LACP ports, the
devices establish a LAG between them. Ensure the following:
• All ports within a LAG must be the same media type.
• A VLAN is not configured on the port.
• The port is not assigned to a different LAG.
• Auto-negotiation mode is not configured on the port.
• The port is in full-duplex mode.
• All ports in the LAG have the same ingress filtering and tagged modes.
• All ports in the LAG have the same back pressure and flow control modes.
• All ports in the LAG have the same priority.
• All ports in the LAG have the same transceiver type.
• The device supports up to 64 LAGs, and eight ports in each LAG.
• Ports can be configured as LACP ports only if the ports are not part of a
previously configured LAG.
• Ports added to a LAG lose their individual port configuration. When ports are
removed from the LAG, the original port configuration is applied to the ports.
This section contains information for configuring ports and contains the following
topics:
• Defining LAG Management
• Defining LAG Settings
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