OS10 Enterprise Edition User Guide Release


Port-channel interfaces

Port-channels are not configured by default. Link aggregation is a method of grouping multiple physical interfaces into a single logical interface — a link aggregation group (LAG) or port -channel. A port-channel aggregates the bandwidth of member links, provides redundancy, and load balances traffic. If a member port fails, the OS10 device redirects traffic to the remaining ports.

A physical interface can belong to only one port-channel at a time, and a port-channel must contain interfaces of the same interface type and speed. OS10 supports up to 128 port-channels, with up to 32 ports per channel.

To configure a port-channel, use the same configuration commands as for Ethernet port interfaces. Port-channels are transparent to network configurations and managed as a single interface. For example, configure one IP address for the group, and use the IP address for all routed traffic on the port-channel.

By configuring port channels, you can create larger capacity interfaces by aggregating a group of lower speed links. For example, you can build a 40G interface by aggregating four 10G Ethernet interfaces together — if one of the four interfaces fails, traffic is redistributed across the three remaining interfaces.

Port-channels are statically configured.
Port-channels are dynamically configured using Link Aggregation Control Protocol (LACP).

Member ports of a LAG are added and programmed into the hardware in a predictable order based on the port ID, instead of in the order in which the ports come up. Load balancing yields predictable results across resets and reloads.

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