CN: Distance Vector Routing

Question

Consider the above network uses Distance vector routing with split horizon. Assume that all the routing tables are stabilized and after sometime link C->D is broken. Now what will be the entry in the routing table of D regarding C?Assume each entry in routing table has a format as:-  DestinationNode | Distance | Intermediate node

Intermediate node is a node to which the source is connected directly and using that node,the source reaches the destination.

Comments

rahul, yes correct

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@joshi_nitish:- Thanks for confirming.

If i ask what will be the b's behavior to reach C at the time when C->D is broken?Because it was also using the same link C->D to reach C.

It will also go to infinity at the time of link broken.And then later it will become 24(B-C) ,right?

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Acc to forouzan there are 2 cases which may arize when the link C-D will broke

Case 1 :- If D advertise its routing table to B first then there will no instability in the system.

Case 2 :- If B advertize its routing table to D first, then using split horizon it will advertise its routing table but not the entry in which D is the next node, Because B learn from D how to reach other nodes through D, So it will advertise following window:-

{A | 12 | -}

{B | 0 | -}

{D | 2 | -}

Not advertise the entry where Dest is C because it learnt from D only. acc to Split horizon.

Coming to the answer the entry in D table regarding C will have cost Infinity due to split horizon.