topic RE: Port aggregation not working properly on Black Diamond 8810 switches in ExtremeSwitching (EXOS/Switch Engine)

Port aggregation not working properly on Black Diamond 8810 switches

Ashu_Chauhan — Thu, 06 Mar 2014 12:32:00 GMT

We are doing Port Aggregation between two Black Diamonds ( 4 Ports ) , but we found that only one ports is taking max traffic and even dropping packets in peak hours . Rest of the ports in LAG barely taking some traffic .

enable sharing 9:23 grouping 9:23-24, 9:47-48 algorithm address-based L2 lacp

RE: Port aggregation not working properly on Black Diamond 8810 switches

dflouret — Thu, 06 Mar 2014 18:55:00 GMT

The problem is probably be related to the algorithm you chose for load-sharing.

If you have a server that is accessed from other vlans or the internet, all traffic to/from it will be exchanged between the server mac and the default gateway mac, even though it belongs to multiple sessions and users, and will be sent through one and only one link in the LAG.

If you change it to L3_L4 (enable sharing 9:23 grouping 9:23-24, 9:47-48 algorithm address-based L3_L4 lacp), traffic will be balanced based on the source and destination IP and port and you'll see a better load balancing among the multiple links in the LAG.

Regards, Daniel

RE: Port aggregation not working properly on Black Diamond 8810 switches

Sumit_Tokle — Sun, 09 Mar 2014 23:36:00 GMT

Explanation from Daniel is absolutely correct. The port selection from sharing is always depends on the type of traffic is passing through the sharing. For same flow the single port will be utilized at all the time. I would also suggest to change the algorithm and see the behaviour.