H3C Technologies H3C Intelligent Management Center - Manual (Page 159)

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can be set up between nodes. You must enable SPB function on all network devices in an SPBN
network.
SPB—Shortest Path Bridging is a technology that creates large and flat non-blocking Layer 2 network.
The SPB technology requires the SPB protocol, which is a bridging method of IEEE 802.1aq and the
extension of the Spanning Tree Protocol (STP).
Transit mode—When an FCoE switch is operating in Transit mode, it can place its Ethernet interfaces in
ENode mode or FCF mode to receive traffic only from specific ENode or FCF switches.
Transit RB—A transit RB is the intermediate node through which a frame passes the TRILL network.
Transit switch—A transit switch is an FCoE switch in Transit mode. Its Ethernet interfaces can operate in
ENode mode or FCF mode. VFM does not manage transit switches.
TRILL device—A TRILL device is a routing bridge (RB).
TRILL—Transparent Interconnection of Lots of Links (TRILL) uses Intermediate System-to-Intermediate
System (IS-IS) to provide transparent Layer 2 forwarding. TRILL combines the simplicity and flexibility of
Layer 2 switching with the stability, scalability, and rapid convergence capability of Layer 3 routing.
VFC—A virtual fiber channel (VFC) interface is a logical interface that is manually created on the FCF
switch to simulate the function of a physical FC interface. A VFC interface must be bound to a physical
Ethernet interface. VFC interfaces support E mode, F mode (the default), and NP mode.
VFM—VAN Fabric Manager (VFM) is an IMC Platform-based network management software for
managing data centers.
VLink—A virtual link (VLink) connects two EVI devices that belong to different DCs.
VM migration—Virtual machine (VM) migration refers to the process that the VM migrates from one
server onto another.
VSAN—The virtual storage area network (VSAN) technology breaks a physical SAN into multiple
isolated VSANs, and provides secure, reliable, and flexible services. Devices in a VSAN cannot get
information about any other VSANs and devices in the VSANs. Each VSAN performs the following
operations independently: selecting a principal switch, assigning domain IDs, running routing protocols,
maintaining routing table and FIB table, and providing services.
VSI—An SPB virtual switch instance (VSI) provides MAC-in-MAC tunnel service for Ethernet service
instances.
WRR—WRR is an algorithm for scheduling the queues in turn. WRR queuing schedules all the queues in
turn to ensure every queue is served for a certain time. Assume a port provides eight output queues.
WRR assigns each queue a weight value (represented by w7, w6, w5, w4, w3, w2, w1, or w0) to
decide the proportion of resources assigned to the queue. On a 100 Mbps port, you can configure the
weight values of WRR queuing to 50, 30, 10, 10, 50, 30, 10, and 10 (corresponding to w7, w6, w5,
w4, w3, w2, w1, and w0, respectively). In this way, the queue with the lowest priority can get a
minimum of 5 Mbps of bandwidth.
WWN—The World Wide Name (WWN) is a 64-bit address that identifies a fabric or an entity (such
as an FC switch, node, or port) in an FC SAN. The upper-layer protocol of FC uses WWNs for
communication. Each entity has a factory-assigned globally unique WWN.
Zone alias—A zone alias is a set of N_Ports, which can be considered as a whole. You can add
common zone members in multiple zones to a zone alias, and add the zone alias in different zones to
simplify configuration.
Zone member—Zone members are N_Ports of servers or storage devices.