HP A7533A HP StorageWorks Fabric OS 6.1.1 administrator guide (5697-0235, Dece - Page 387
FCIP services license, Platforms that support SAN extension over IP, QoS concepts and implementation
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FCIP services license Most of the FCIP extension services described in this chapter require the High Performance Extension over FCIP/FC license. Use the licenseShow command to verify the license is present on the hardware used on both ends the FCIP tunnel. For details on obtaining and installing licensed features, see "Licensed features" on page 34. Platforms that support SAN extension over IP Fabric OS supports SAN extension between 400 Multi-protocol Routers or between FR4-18i blades installed on 4/256 SAN Directors or DC SAN Backbone Directors. The 400 Multi-protocol Router and FR4-18i both have16 physical Fibre Channel ports and two physical GbE ports. NOTE: The FCIP Tunneling Service for the 400 Multi-protocol Router and FR4-18i blade is not compatible with the XPath FCIP service; nor is it compatible with any other vendor's FCIP implementation. QoS concepts and implementation over FCIP Quality of Service (QoS) refers to policies for handling differences in data traffic. These policies are based on data characteristics and delivery requirements. For example, ordinary data traffic is tolerant of delays and dropped packets, but voice and video data are not. QoS policies provide a framework for accommodating these differences in data as it passes through a network. FOS versions 6.0.0 and later provide for Fibre Channel QoS through internal QoS priorities. Those priorities can be mapped to TCP/IP network priorities. There are two options for TCP/IP network based QoS: • Layer three DiffServ code Points (DSCP). • VLAN tagging and Layer two class of service (L2CoS). DSCP quality of service Layer three class of service DiffServ Code Points (DSCP) refers to a specific implementation for establishing QoS policies as defined by RFC2475. DSCP uses six bits of the Type of Service (TOS) field in the IP header to establish up to 64 different values to associate with data traffic priority. DSCP settings are useful only if IP routers are configured to enforce QoS policies uniformly within the network. IP routers use the DSCP value as an index into a Per Hop Behavior (PHB) table. Control connections and data connections may be configured with different DSCP values. Before configuring DSCP settings, determine if the IP network you are using implements PHB, and consult with the network administrator to determine the appropriate DSCP values. L2CoS quality of service Devices in physical LANs are constrained by LAN boundaries. They are usually in close proximity to each other, and share the same broadcast/multicast domain. Physical LANs often contain devices and applications that have no logical relationship. Also, when logically related devices and applications reside in separate LAN domains, they must be routed from one domain to the other. A VLAN is a virtual LAN network. A VLAN may reside within a single physical network, or it may span several physical networks. Related devices and applications that are separated by physical LAN boundaries can reside in the same VLAN. Also, a large physical network can be broken down into smaller VLANs. VLAN traffic is routed using 802.1Q compliant tags within an Ethernet frame. The tag includes a unique VLAN ID, and Class of Service (CoS) priority bits. The CoS priority scheme (sometimes called Layer two Class of Service, or L2CoS), uses only the upper three bits of the TOS field, allowing eight priorities. Fabric OS 6.1.x administrator guide 387
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