Ted, > -----Original Message----- > > What matters is that an observation has been made that a L2 VPN could > have severe negative behavior characteristics in plausible > circumstances. This is a really strong reason not to use an L2 VPN.
[Linda] I understand that many people are still not convinced of the need for hosts within one subnet to be placed in different server racks. For a typical Data Center, there may be many instances of WebServer in one subnet (typical one VLAN), many instances of AppServer in another subnet, and many instances of DBServer in yet another subnet. Being in one subnet doesn't mean that those hosts (or applications) have higher traffic among themselves. One of the main reasons for partitioning hosts to multiple Subnets is 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. Placing hosts based on their Subnets actually creates more across rack traffic than placing instances of different functions (or subnets) based on their traffic patterns. 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
