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MEC from VSS pair to access switch

scott.leonard
Level 1
Level 1

Dual homed to VSS.png

 

 

 

 I have 2 6807 chassis Core1 and Core2 joined via VSS and connected via MEC to access Switch 1. Server 1 is connected to Core 1 and PC 1 - 3 connected to Switch 1. When I run iPerf between Server 1 and the 3 PC's I get different paths depending on the direction. When the traffic flow is from the PC's to Server 1 the traffic utilizes both links in the multichassis etherchannel and I see 2 GB/s speeds. However, when the direction is from Server 1 to the 3 PC's the traffic only utilizes the C1 - SW1 side (G1/1/1 to G1/3) and ignores the C2 - SW1 side of the channel.

 

Unfortunately, when imaging a classroom the traffic is from Server 1 to the PC's and that is when I want to utilize the full 2 Gb/s bandwidth of the etherchannel. Can anyone tell me why this is and if there is a way to make traffic flow across both links when going from Server 1 to the PC's?

 

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