vSAN Clustering Multicast problems

[SrVMwarer]

Hello vSAN Architects!

While learning vSAN by reading the vSAN essential book by depping Duncan Epping page 47, as much as I understand that if we see " Multicast assessment based on other checks" failed

that means we have problems with vSAN clutser because of something related to the Multicast from physical Networks

Following:

Option 1: Disable internet group management protocol (IGMP) snooping for the vSAN traffic VLAN. Now this will allow all multicast traffic through; but if the only traffic is vSAN, this should be a negligible amount of traffic and should be safe to use.

Option 2: Configure IGMP snooping querier. If there is other multicast traffic and you are concerned that disabling IGMP snooping might open the network up to a flood of multicast traffic, this is a preferred option.

I can read the words only, but yet I can't understand these words technically would you mind explaining it to me in other words.

[SrVMwarer]

Hello anybody can help :smileygrin:

[daphnissov]

This is now old information as vSAN, some time ago, was converted to use Unicast. So, while we could explain it, it probably wouldn't be relevant for you (unless you're implementing an old version of the product).

[SrVMwarer]

I am trying to understand it, However this is very helpful mention that it is an old version I must read updated versions of books. I am still interested in understanding how did it work : ))

[daphnissov]

What the author is saying here is that in case there are multicast issues on the VLAN used to carry vSAN traffic, you can either disable IGMP snooping altogether, OR you can enable IGMP snooping querier if you have other multicast traffic using that same segment. For explanations of IGMP snooping I advise you to use Google.

[SrVMwarer]

I just did thanks mate made it clearer