Will configuring LACP increase throughput on the link?

MVP Expert
MVP Expert
Q:

Will configuring LACP increase throughput on the link?



A:

LACP/Port channel allows multiple ports to be bundled between the controller and the uplink switch. 
This distributes the packets between the links and this also helps in port redundancy and thereby decreasing delay and traffic congestion.
However, the maximum throughput between any two devices behind each end of the port channel will not exceed the link speed of the physical port in the path.

For example, we have a port channel configured with two 1 Gig ports and two servers are connected to a 10 Gig port on each controller. 

 

 

If server1 and server2 communicates with each other, the frames from the server 1 is passed through either 0/0/1 or 0/0/2 based on the source MAC address. 
Similarly the traffic from server 2 is passed through either 0/0/1 or 0/0/2 of controller 2.
However, the frames from other clients would pass through other interface of the port channel and thereby decreasing the congestion in the traffic.
The traffic from a particular client for a particular session will be passed on any one of the interfaces of the port channel. 
As the traffic from any client will not be simultaneously passed on both the interfaces of the port channel, the throughput between the two servers will not exceed 1 Gbps which is the minimum port speed across the path. 

Version history
Revision #:
2 of 2
Last update:
‎03-13-2019 12:21 PM
Updated by:
 
Labels (1)
Contributors
Search Airheads
cancel
Showing results for 
Search instead for 
Did you mean: