Failback when using Etherchannel and FCoE

I have an environment that I am able to dig in for the purposes of learning, but I can't it.  Since I can't make any changes to the environment and experience, I wanted to ask a few questions here.  I'm trying to figure out what that the failback option of virtual exchanges must be defined on when using FCoE and etherchannel.

The environment consists of:

  • FCoE
  • 2 cards of CNA
  • EtherChannel
  • vPLEX
  • Cluster of metro
  • Nexus 5000


Each host connects to a single vDS and each portgroup is configured to use:

  • Load balance policy: route based on the hash of the IP
  • Active uplinks: two 10 GbE CNAs
  • Eve & uplinks used: no
  • Physical switch is configured for etherchannel.


The vSphere networking 5.5 guide says the following for failback on vDS trade option:


Failback Select Yes or no to disable or enable failback. This option determines how a physical card is returned to active duty after recovering from a failure. If failback is set to Yes (the default), the adapter is returned to active duty as soon as their recovery, moving the daughtercard, which resumed its accommodation, as appropriate. If failback is set to no, an adapter failing has been idle even after the recovery until another active adapter fails, requiring a replacement.


This evokes the assets & Eve links and since using etherchannel requires that all active links with no standby connection, this means that the restore option does not apply to etherchannel configurations?  Or applies to the way in which the load is re -distributed when a link comes back after having been conducted? 


For example, that we have a portgroup with two uplinks (uplink1 & uplink2), load balancing policy, the hash value of the IP and physical switch ports are in an etherchannel configuration.  During the normal operation of the IP of the hash calculations (http://blogs.vmware.com/kb/2013/03/troubleshooting-network-teaming-problems-with-ip-hash.html) are made and the load is distributed across the two uplinks.  Let's say the physical switch that connects uplink2 in goes down.  The ESXi hosts connected to that vDS immediately come into uplink2 equation which means uplink1 would only result in the calculation of hash IP?  What is the impact of the automatic restore option when uplink2 is back?  If failback is set to no, uplink2 still wouldn't be in the equation?  If so, how you would get it back in the equation?  Or when the link is up is immediately shot down there regardless of the restore option?  It feels like I'm missing something here. 

Also, I read that attributing no failback is recommended when using IP storage, because it can lead to port heartbeat that can cause performance issues with the storage.  But I also read that traffic to an etherchannel appears as a single MAC/connection address.  This recommendation apply in an etherchannel configuration?  Are port and MAC stir the same thing?  Or is beating port just at the moment where the link goes up and down and MAC beat is when the MAC's switch between two ports?

Sorry if these are fundamental questions, but not being a networking guy and not being is not able to experiment makes it hard.  Thanks for any help.

The Member State of the binding not arise unless the link is established on both sides.

I agree with the statement portfast. All the links go to an ESXi server do not participate in spanning tree protocols. The goal is to transition to a State of transfer immediately on the link turning upward. This must be paid regardless of the use of an OFFSET.

LACP will dynamically build the GAL and validate the configuration on both sides is correct. I prefer LACP (dynamic LAG) on any static sort of LAG, but this requires a switch on the side of vSphere distributed. If you have the VDS, using LACP. However, LACP does not solve the problem of covering tree (you still want to avoid using tree covering weight on the SHIFT going the ESXi host).

Tags: VMware

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