> -----Original Message----- > VM placement affinity rules would NEVER see absolutely every local VM > belonging to a different tenant network and requiring connectivity only > to remote VMs.
[Linda] Being in one VLAN (or subnet) doesn't mean that those hosts (or applications) have higher traffic among themselves. For a typical Data Center, you may have many instances of WebServer in one subnet (typical one VLAN), many instances of AppServer in another subnet (VLAN), and many instances of DBServer in yet another subnet. The Subnet is only for policy enforcement and load balance purposes. The amount of traffic between "WebServer Instances" <-> "AppServer instances" <-> "DB server instances" is magnitude higher than the heartbeat traffic among all instances of one function. For some DC operators who want to optimize their traffic across racks, placing instances from different subnets in one rack can eliminate a lot of traffic traversing among racks. Linda _______________________________________________ Int-area mailing list Int-area@ietf.org https://www.ietf.org/mailman/listinfo/int-area
