February 2000
Intermediate to advanced
387 pages
7h 36m
English
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CRANKBACK AND ALTERNATE ROUTING
The DTL may not be the most accurate information because of the changing conditions in the routing domain. Consequently, a call being processed according to the DTL information may be blocked. When this situation occurs, the call is cranked back to the creator of the DTL, with an indication of the problem. This node can then choose an alternative path for the call, or may crank back the call further. The alternate path must avoid the paths in the original call of course, and must obey all received higher-level DTLs, in order to support the address aggregation tables in the routing domain.
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