VMware-vSphere5.5-Platform-Whats-New(18)

vSphere 5.5最新资料

What’s New in VMware vSphere 5.5 Platform As shown in Figure 10, the traffic-filtering configuration is at the port group level.

(CoS), applied on Ethernet/layer 2 packets, and Differentiated Service Code Point (DSCP), applied on IP packets. The physical network devices use these tags to identify important traffic types and provide QoS based on the value of the tag. Because business-critical and latency-sensitive applications are virtualized and are run in parallel with other applications on an ESXi host, it is important to enable the traffic management and tagging features on VDS.

The traffic management feature on VDS helps reserve bandwidth for important traffic types, and the tagging feature enables the external physical network to detect the level of importance of each traffic type. It is a best practice to tag the traffic near the source and help achieve end-to-end QoS. During network congestion scenarios, the highly tagged traffic doesn’t get dropped, providing the traffic type with higher QoS.

VMware has supported 802.1p tagging on VDS since vSphere 5.1. The 802.1p tag is inserted in the Ethernet header before the packet is sent out on the physical network. In vSphere 5.5, the DSCP marking support enables users to insert tags in the IP header. IP header–level tagging helps in layer 3 environments, where physical routers function better with an IP header tag than with an Ethernet header tag.

T E C H N I C A L W H I T E P A P E R/18