Accton Technology 24/48-Port, ES4548D, ES4524D manual Setting a Load-Balance Mode for Trunks, 46-2

Setting a Load-Balance Mode for Trunks 17

CLI – This example creates trunk 1 with ports 9 and 10. Just connect these ports to two static trunk ports on another switch to form a trunk.

Console(config)#interface	port-channel 1	45-1
Console(config-if)#exit
Console(config)#interface	ethernet 1/9	45-1
Console(config-if)#channel-group 1		46-2
Console(config-if)#exit
Console(config)#interface	ethernet 1/10
Console(config-if)#channel-group 1
Console(config-if)#end
Console#show interfaces status port-channel 1		45-8
Information of Trunk 1
Basic information:
Port type:	1000T
Mac address:	00-30-F1-D4-73-A2
Configuration:
Name:
Port admin:	Up
Speed-duplex:	Auto
Capabilities:	10half, 10full, 100half, 100full, 1000full
Flow control:	Disabled
Port security:	Disabled
Max MAC count:	0
Current status:
Created by:	User
Link status:	Up
Port operation status:	Up
Operation speed-duplex:	1000full
Flow control type:	None

Member Ports: Eth1/9, Eth1/10,

Console#

Setting a Load-Balance Mode for Trunks

When incoming data frames are fowarded through the switch to a trunk, the switch must determine to which port link in the trunk an outgoing frame should be sent. To maintain the frame sequence of traffic flows between devices in the network, the switch also needs to ensure that frames in each “conversation” are mapped to the same trunk link. To achieve this requirement and to distribute a balanced load across all links in a trunk, the switch uses an algorithm based on frame source or destination addresses to calculate an output link number in the trunk. However, depending on the device to which a trunk is connected and traffic flows in the network, this load-balance algorithm may result in traffic being distributed mostly on one port in a trunk.

To ensure that the switch traffic load is distributed evenly across all links in a trunk, the source or destination addresses used in the load-balance calculation can be selected to provide the best result for trunk connections. The switch provides six load-balancing modes:

•Source MAC Address: All traffic with the same source MAC address is output on the same link in a trunk. This mode works best for switch-to-switch trunk links where traffic through the switch is received from many different hosts.

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