| 单词 | mesh topology |
| 释义 | mesh topology A network topology characterized by the intertwining of nodes through links connect- ing them together directly, rather than through one or more intermediate points of interconnection.There are two types of mesh topologies: full mesh and partial mesh. • full mesh: A topology that connects every node directly with every other node. A full mesh minimizes propagation delay, latency, and the potential for data errors and loss in transit, as the path is direct and involves no intermediate processing points. A full mesh also provides the greatest number of alternative paths between any two nodes, which has the advantage of extreme network redundancy and resiliency. In the event of a catastrophic failure or performance degradation anywhere in the network, sufficiently intelligent nodes can redirect traffic around the point of failure. A full mesh topology would be highly desirable if it were not for the large number of circuits and ports required. An eight-node full mesh network, as illustrated in Figure M-1, requires 28 circuits, each of which requires two ports, calculated as follows: X = n( n – 1) / 2 28 = 8(8 – 1) / 2 The cost and complexity of full mesh networks generally makes them impractical for more than three or four nodes, at least in wireline networks.Wireless networking can be quite another matter in some cases. Several Wireless LAN (WLAN) technologies operating in the unlicensed ISM bands support full mesh networking, as the cost of a establishing a link is essentially zero, as is the level of complexity. • partial mesh: A topology that provides a path by which any node can connect with any node, but not necessarily a direct path, and which provides no common point of interconnection for all nodes. A partial mesh is characterized by a backbone that takes the form of a small mesh of centrally located 74570c13.qxd 9/11/07 12:25 PM Page 307 |
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