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diffusing update algorithm Last modified: Thursday, November 16, 2006
Abbreviated as DUAL, the diffusing update algorithm is a routing protocol used by EIGRP to calculate and create routing tables to determine whether a path is looped or loop-free. It also allows a router running EIGRP to find alternate paths without waiting on updates from other routers. The diffusing update algorithm (DUAL) was developed at SRI International by Dr. J.J. Garcia-Luna-Aceves. See also Enhanced Interior Gateway Routing Protocol (EIGRP).
A More Efficient Distance Vector Routing Algorithm (PDF) A whitepaper by J. J. Garcia-Luna-Aceves. Advanced Encryption Standard (AES) This document describes the Advanced Encryption Standard feature in Cisco IOS Release 12.2(13)T. Enhanced Interior Gateway Routing Protocol (EIGRP) EIGRP contains several important protocols that greatly increase its operational efficiency relative to other routing protocols. One of these protocols is the Diffusing update algorithm (DUAL) developed at SRI International by Dr. J.J. Garcia-Luna-Aceves. DUAL enables EIGRP routers to determine whether a path advertised by a neighbor is looped or loop-free, and allows a router running EIGRP to find alternate paths without waiting on updates from other routers.	Related Categories Internet Protocols Routing Related Terms DDR Enhanced Interior Gateway Routing Protocol hot potato routing Interior Gateway Routing Protocol OSPF router routing virtual router