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Vmware Link State Only Vs Beacon Probe

jskfan
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Vmware Link State Only Vs Beacon Probe

I have done some reading about Vmware Link State Only Vs Beacon Probe.
Not sure about the difference from Vmware administrator perspective, since if there is a failure somewhere in the Network then it does not matter which detection option you have used.
it states that to use Beacon, it is recommended to have 3 or more physical Nics
Any clarification on this topic ?

Thank you
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
Link Status Only - this relies on the LINK STATUS on the network interface, e.g. insert or remove a cable and the LINK LIGHT goes ON or OFF respectively. Also detects if a physical switch reboots/powers off.

Beacon Probing - sends out a beacon probe on all network interfaces in the team, and then listens for the response, this is used also in conjunction with Link Status Only - this determine's in there is a link failure.

You could just have 2 in the team, but they must be active/active or active/standby, the nics must not be set to unused.

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Commented:
What does it help Vmware Administrator with when configuring either Link Status Only or Beacon Probing  ?

if I understand when the link fails then probably the best that vSwitch can do is , it will know which link has failed if it was configured with Beacon Probing, and it will not know which link has failed if it was configured with Link Status Only

By the way, I have read that 3 physical Adapters are required on the vSwitch to have the Beacon Probing efficiently detect the link that has failed
Also based on what elements that Vmware Administrator will configure Beacon Probing or Link Status Only?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
What does it help Vmware Administrator with when configuring either Link Status Only or Beacon Probing  ?

If you can use Beacon Probing you should, it's another layer of failure detection. It can detect upstream link failures.

Link State only will only detect a failure of the first physical switch conneced to.

By the way, I have read that 3 physical Adapters are required on the vSwitch to have the Beacon Probing efficiently detect the link that has failed

So much depends on the physical switches you are connected to. 2 or more are required for a team.

Again all this depends on your network design from the start, rather than just click options.

See this document

https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/techpaper/virtual_networking_concepts.pdf

This was one of the original ESX/ESXi document whitepapers explaining networking, which is still very relevant today.

Author

Commented:
from this Link: https://kb.vmware.com/s/article/1005577

Where it makes sense to enable Beacon Probing:
b
Where it does not make sense to enable Beacon Probing:
bOR here:
b
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
Yes, they are many different scenarios, depends on your network design, and if you have the ability to influence network design, or just have to use what has been given to you!

and sometimes you may not be given diagrams as to how the network is organised.

VMware loves to paint a classroom textbook picture, but remember VMware creates documentation for EXAMS, and not necessarily what is in the wild!!!!

This is a typical VCP exam question!

are you training for a VCP ?

Author

Commented:
am not training for VCP..Just like to hover over Technology  such as VMware , Cisco, Microsoft, etc....
I go back and forth......

Well, regarding Link Status Only  and Beacon Probing...I believe the latter can be more helpful to detect the failure in the upstream physical switches and failover the traffic to the link that is up... that said , it will only be helpful if the design of the network is tailored to beacon probing as posted on the first screenshot.

Link status Only will detect the failure on just the connected link

Now if you are Vmware Admin and you are not aware of the Network Design, can you just leave it with Link Status Only ?

Thanks
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
am not training for VCP..Just like to hover over Technology  such as VMware , Cisco, Microsoft, etc....
I go back and forth......

Okay, I was just re-interrating this is often an exam question! so remember!

Well, regarding Link Status Only  and Beacon Probing...I believe the latter can be more helpful to detect the failure in the upstream physical switches and failover the traffic to the link that is up... that said, it will only be helpful if the design of the network is tailored to beacon probing as posted on the first screenshot.

Correct, that's what I wrote! (it also includes Link Status!)

Link status Only will detect the failure on just the connected link

Correct, poor man's failure detection...

Now if you are Vmware Admin and you are not aware of the Network Design, can you just leave it with Link Status Only ?

Correct, that will provide you with basic protection.

Author

Commented:
if inadvertently selected Beacon Probing and the design was not adequat enough to take advantage of Beacon Probing .....then it is not going to hurt anything... Correct ?
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It should not do, but with all configurations, you should always test a configuration and solution.

e.g. we've dropped beacon probing on one site because it affected the teaming configuration when it was enabled! (they use HPE 5500 Edge Switches) and reverted to Link State only (basic), because we could not negotiate with the Networking Team to investigate further!

Author

Commented:
Thank you for the Info.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
not a problem.....