Routing algorithm

Routing Algorithm 2004. 11. 3 Ahn Kook Jin

Contents ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Routing Protocol and Algorithm ,[object Object],source host destination host 5 2 1 2 3 1 3 5 2 1 B A C E D F first-hop router default router source router destination router least-cost path

Classifications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Link State Routing Algorithm ,[object Object],[object Object]

Link State Routing Algorithm ,[object Object],D B C A e 1 1 2+e 0 0 1+e 0 0 0 1 1 0 0 0 e 0 1+e 0 0 0 0 0 1+e 1 2+e 0 2+e 0 0 1+e 0 0 0 1

Distance Vector Routing Algorithm ,[object Object],[object Object],[object Object],[object Object]

Distance Vector Routing Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object]

Distance Vector Routing Algorithm 7 2 1 Y X Z 7 ∞ Z ∞ 2 Y Z Y D X 1 ∞ Z ∞ 2 X Z X D Y 1 ∞ Y ∞ 7 X Y X D z

Distance Vector Routing Algorithm 7 2 1 Y X Z 7 3 Z 8 2 Y Z Y D X 1 9 Z 8 2 X Z X D Y 1 9 Y 3 7 X Y X D z

Distance Vector Routing Algorithm 7 2 1 Y X Z 7 3 Z 8 2 Y Z Y D X 1 5 Z 4 2 X Z X D Y 1 9 Y 3 7 X Y X D z

Distance Vector Routing Algorithm ,[object Object],50 4 1 1 Y X Z 6 4 X Z X D Y 5 50 X Y X D z

Distance Vector Routing Algorithm ,[object Object],50 4 1 60 Routing loop Y X Z 6 60 X Z X D Y 5 50 X Y X D z

Distance Vector Routing Algorithm ,[object Object],50 4 1 60 Too many iterations! (count-to-infinity problem) Y X Z 8 60 X Z X D Y 9 50 X Y X D z

Distance Vector Routing Algorithm ,[object Object],50 4 1 60 Y X Z ∞ 4 X Z X D Y 5 50 X Y X D z

Distance Vector Routing Algorithm ,[object Object],[object Object],50 4 1 60 Y X Z 51 60 X Z X D Y ∞ 50 X Y X D z

LS Algorithm vs. DV Algorithm Bad Good Robustness Slow(count-to-infinity problem) O(n 2 ) algorithm Speed of convergence Maybe small O(nE) Message complexity DV LS

Hierarchical Routing ,[object Object],[object Object],[object Object],[object Object]

Hierarchical Routing Autonomy system(AS) Gateway router Intra-AS Inter-AS B.a B.a A.a A.b A.c A.d C.b C.c C.a Host H1 Host H2

Hierarchical Routing Topological view for inter-AS routing protocol B.a A.a A.c C.a

Routing algorithm

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Routing algorithm