networking - RIP- Counting to infnity -



networking - RIP- Counting to infnity -

i'm having problems understanding count infinity rip.

i understand how table set using distance vectors. when link breaks costs must recalculated , updated in new table. i'm not sure how (3,3) value updated after (4,1). why cost node 3 node 3 3.

in illustration prof posted link between node 3 , 4 breaks.

the table route table node 4 destination.

(x,y) in table means "i can node 4 via x in y steps.

before break: n1 can n4 via n2 in 3 steps. n2 can n4 via n3 in 2 steps. n3 can n4 via n4 in 1 step.

after break, n3 no longer knows how n4 directly. problem n2 thinks knows how n4 in 2 steps, , communicates n3. hence n3 thinks can n4 via n2 in 3 steps, , downward spiral begins.

networking routing router

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