Distance vector routing algorithm
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This document provides an example to illustrate how the distance vector routing algorithm works. It shows the vector tables of routers B, D, and C that store the distances to all other routers. It then calculates the routing table for router A based on the distances through neighboring routers B, D, and C, taking the minimum distances. The final routing table for A is (0, 2, 2, 1, 2, 2) with routes going through routers D, C, D, D, D respectively.
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Distance vector routing algorithm
- 1. B Y G A U R A V S I N G H R A W A T 1 2 3 1 6 E N 0 0 9 S Y S T E M E N G I N E E R I N G Distance Vector Routing Algorithm
- 2. Solution of Distance vector Routing Algorithm Distance Vector Routing algorithm is a distributed algorithm. This routing algorithm is a iteration algorithm. When ever a packet comes to router the neighboring router will give the vector table and a new vector table is created at that router. Now we understand this with a simple example:
- 3. Distance Vector Routing Algorithm A C B D F E Vector table New routing table Packet transfer to router A
- 4. A B C D E F Vector table of B (1, 0, 3, 2, 4, 3). Vector table of D (2, 1, 2, 0, 1, 1). Vector table of C (3, 2, 0, 4, 5, 6). measured delay of B,D,C from A are 3,1,2. Now calculate the final routing table of A=? A, B, C, D, E, F Routing Table of A via B=(0, 3, 6, 5, 7, 6). AB=AB+BB=3+0=3; AC=AB+BC=3+3=6; AD=AB+BD=3+2=5; AE=AB+BE=3+4=7; AF=AB+BF=3+3=6; AA=0;
- 5. A B C D E F Routing Table of A via D: (0, 2, 3 , 1, 2, 2) AB=AD+DB=1+1=2 AC=AD+DC=1+2=3 AD=AD+DD=1+0=1 AE=AD+DE=1+1=2 AF=AD+DF=1+1=2 A B C D E F Routing Table of A via C: (0, 4, 2, 6, 7, 8) AB=AC+CB=2+2=4 AC=AC+CC=2+0=2 AD=AC+CD=2+4=6 AE=AC+CE=2+5=7 AF=AC+CF=2+6=8
- 6. Now the final routing table of A: Taking minimum value of A via (B,C,D): = (0, 2, 2, 1, 2, 2) router used for the routing table of A is; = (0, 2, 2, 1, 2, 2) (_, D, C, D, D, D). As similarly we find the routing table of all other router.