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https://kb.vmware.com/s/article/2044735
IP Multicast sends data to a group of receivers in a single transmission using Multicast groups and the IGMP protocol. In ESX/ESXi, Multicast works the same way it does in a physical environment and the requirements and considerations are also the same.
https://communities.vmware.com/thread/86572
Feb 23, 2009 · IGMP snooping isn't supported on ESX, and for a good reason: we don't need it. We directly know the multicast filters applied to each virtual port of a vswitch, so there's no need to "learn" group memberships.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-97724211-5167-428F-A217-871963A7DFF7.html
In addition to the default basic mode for filtering multicast traffic, vSphere Distributed Switch 6.0.0 and later releases support multicast snooping that forwards multicast traffic in a more precise way based on the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) messages from virtual machines.
https://community.cisco.com/t5/switching/nexus-7k-and-esx-host-multicast-issues/td-p/2042820
Hi all, I having a multicast issue and hope someone can give me some input in this. I've got a cluster of Linux servers with 5 nodes spreading between two ESX hosts (3 nodes on one and 2 nodes on the other) and both ESX hosts are connected to same Nexus 2K. The way the cluster is setup is all 5 no...
https://www.borgcube.com/blog/2016/03/12/multicast-support-in-vsphere/
I have fielded a number of questions on VMware’s multicast support and figure it is time I did a short blog on it. There is a good white paper on the topic on the VMware site called Multicast Performance on vSphere 5.0 that deals with performance changes that have been made to enhance multicast support in vSphere 5. The recurring question I get is how multicast is handled in vSphere.
http://www.vryan.co.uk/index.php/2015/06/03/how-to-enable-vm-multicast-traffic-across-multiple-hosts-on-cisco-ucs/
Recently I was asked to investigate an issue occurring on some VM’s within the environment I look after. The sysadmin informed me that he was unable to receive multicast traffic on VM’s in the same VLAN when they were separated on different hosts in the cluster. However, when the …
https://blogs.vmware.com/performance/2011/08/multicast-performance-on-vsphere-50.html
Aug 31, 2011 · In releases of vSphere prior to 5.0, the packet replication for multicast is done using a single context. When there is a high VM density per host, at high packet rates the replication context may become a bottleneck and cause packet loss. VMware added a new feature in ESXi 5.0 to split the cost of replication across various physical CPUs.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-50AF72D4-F766-4D68-8330-BA15250E4E99.html
Use multicast snooping on a vSphere Distributed Switch to forward traffic in a precise manner according to Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) membership information that virtual machines send to subscribe for multicast traffic.
https://blogs.vmware.com/vsphere/2013/05/vxlan-series-multicast-basics-part-2.html
May 03, 2013 · In the last post here, I provided some details on vSphere hosts configured as VTEPs in a VXLAN deployment.Also, I briefly mentioned that Multicast protocol support is required in the physical network for VXLAN to work. Before I discuss how Multicast is utilized in VXLAN deployment, I want to briefly talk about some of basics on Multicast.
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