Server VIF Paths FEX Host & Network Port Pinning

Hello,
I have a UCS-B Series Chassis with 4 B200 M2 Blades connecting to 2 6124 FI's with 4 Server Ports to each FI.
I'm wondering if anyone can help me understand VIF Paths & FEX "Pinning"?
Here's a screenshot of the VIF Paths tab for Server 1:
From my understanding each blade has two FEX Host Ports (right & left) and those pin to FEX Network Ports (aka Server Ports). Unlike SAN & LAN pinning I can't seem to figure out how to specify FEX Port pinning or control its behavior.
The reason why I'm wondering this is because I was doing a Test Plan Execution and pulled the right/1 & left/1 FEX Network Port silmultaniously. This caused me to lose connectivity to my Server 1 that was pinned to those ports. I would have thought the blade would "automatically" fail-to/use the next available FEX Network Port, either right/2, right/3, right/4 or left/2, left/3, left/4 but this wasn't the case.
Can anyone please explain?
Thanks in advance,
-Brian

Pinning from the FEX/IOM to the Blades is hard coded by the FEX during initialization. It's not user configurable. The pinning is determined at initialization depending on the number links between the FEX and the FI.
Now when you pull a link between a FEX and FI we never ever repin the links on failure. So I'm not surprised that you lost network connectivty when you pulled all the links. If you re-ack the chassis after you a pull a FEX link it will repin the connections but we never do it automatically. Keep in mind a re-ack will mean the blades will take a short network outage while the connections are repinned.
With the second generation FI (6248) and second generation IOM (2208) you can create a port-channel between the FI and IOM. In this case if one link fails the traffic will get re-balanced across the other links.
So to recap.
Gen 1 hardware everything is pinned automatically by the IOM. Failure of a link means those servers lose network connectivity on that fabric. A chassis re-ack will fix the problem but could cause a short network outage on the other servers
Gen 2 hardware has the capability to do a port-channel between the FI and IOM. In this case pulling a cable between FI and IOM should not cause a network outage of the server.
Hope that helps.
louis

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Server VIF Paths FEX Host & Network Port Pinning

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