Summary
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Routing is a critical function in the global switched telephone network. |
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It is important to note that the term dynamic routing used in this chapter refers to dynamic call routing in the telephone network; it should not be confused with dynamic routing in IP networks. |
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Most dynamic call routing schemes for the telephone network require exchange of link state information—such information exchange does not use flooding; instead separate dedicated channels or a signaling network are used. |
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Hierarchical routing is a routing method based on hierarchical addressing. |
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Dynamic routing performs the same function as static routing except it is more robust. |
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Static routing allows routing tables in specific routers to be set up in a static manner so network routes for packets are set. |
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Dynamic routing allows routing tables in routers to change as the possible routes change. |
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Dynamic Non hierarchical Routing commonly known as DNHR can overflow to alternate if needed and also drop call if all alternate paths are busy. |
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Dynamically Controlled Routing is a routing system controlled by a centralized Network Processor (NP) that provides to the switches an alternative path recommendation for traffic in a network. |