Eye on Blades Blog: Trends in Infrastructure
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Question: What does “receive path validation” do and what could be the reason for the failure?

This one of the methods used to provide fail over for network traffic. 


From our BladeSystem support staff


"This is just a “redundancy mechanism” that is part of the HP Teaming driver.Not trying to over simply things but here it goes. NIC A and NIC B are teamed together. NIC A is receiving frames okay, NIC B has not received any frames.Teaming driver sends “Test Frame” out NIC A, sets timers and waits for NIC B to receive it. This is repeated a few times.If NIC B still has not received a frame after a few intervals, it is determined the RX (Receive) Path to this NIC is broken, thus NIC is marked as “Receive Path Validation” and is removed as an Active member of the team. This is a good thing because we don’t want a NIC in the team that can’t hear… So…either there is a problem with that NIC receiving frames (fix it) or there is a problem in the Teaming driver detecting “false” RX Path failures.Either way the recommendation is never to disable it as a solution to the problem.


Blade Hacks: NIC teaming recommendations with Virtual Connect

A simple question came across the virtual watercooler yesterday and the experts weighed in with some great advice.


What are the recommended NIC teaming options when using VC? Any conditions where one setting would be preferable over another?


There are no “recommended” NIC teaming option for Virtual Connect but ther is extra flexibility in defining your uplink sets, which give you HA you can’t get in the rackmount world.  To summarize:


You can make an NFT team from NICs that are serviced by the same or different VC Ethernet modules.  One NIC or the other is active at any given moment, and stays active until a link loss is detected.  Note – Smartuplink should be set on VC networks servicing NFT teams, so that an uplink failure translates to a downlink failure to the NIC, triggering NFT to fail over to the other NIC.  If all NICs in an NFT team are serviced by the same module, that module can be a single point of failure.  If serviced by separate modules, then you have better HA.

You can make a TLB team from NICs that are serviced by the same or different VC Ethernet modules.  If all NICs in an TLB team are serviced by the same VC module, that module can be a single point of failure.  If serviced by separate modules, then you have better HA.

SLB is NOT supported with any VC module. SLB=port channeling and VC doesn’t support it. Only NFT and TLB are supported.

See the Virtual Connect Ethernet cookbook and Usage Scenario videos found here for more details.


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