API Guide

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Port-channel interfaces
Port-channels are not configured by default. Link aggregation (LA) 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. A port-channel must contain interfaces of the same interface
type and speed. OS10 supports a maximum of 128 port-channels, with up to thirty-two ports per channel.
To configure a port-channel, use the same configuration commands as the Ethernet port interfaces. Port-channels are
transparent to network configurations and manage 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 redistributes across the three remaining interfaces.
Static Port-channels are statically configured.
Dynamic Port-channels are dynamically configured using Link Aggregation Control Protocol (LACP).
Member ports of a LAG are added and programmed into the hardware based on the port ID, instead of the order the ports come
up. Load balancing yields predictable results across resets and reloads.
Create port-channel
You can create a maximum of 128 port-channels, with up to 32 port members per group. Configure a port-channel similarly to a
physical interface, enable or configure protocols, or ACLs to a port channel. After you enable the port-channel, place it in L2 or
L3 mode.
To place the port-channel in L2 mode or configure an IP address to place the port-channel in L3 mode, use the switchport
command.
● Create a port-channel in CONFIGURATION mode.
interface port-channel id-number
Create port-channel
OS10(config)# interface port-channel 10
Add port member
When you add an interface to a port-channel:
● The administrative status applies to the port-channel.
● The port-channel configuration is applied to the member interfaces.
● A port-channel operates in either L2 (default) or L3 mode. To place a port-channel in L2 mode, use the switchport mode
command. To place a port-channel in L3 mode and remove L2 configuration before you configure an IP address, use the no
switchport command.
● All interfaces must have the same speed.
● An interface must not contain non-default L2/L3 configuration settings. Only the description and shutdown or no
shutdowncommands are supported. You cannot add an IP address or static MAC address to a member interface.
● You cannot enable flow control on a port-channel interface. Flow control is supported on physical interfaces that are port-
channel members.
● Port-channels support 802.3ad LACP. LACP identifies similarly configured links and dynamically groups ports into a logical
channel. LACP activates the maximum number of compatible ports that the switch supports in a port-channel.
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Interfaces