RIP V1 – Some points to remember

Routing advertisements Transmit rules :

1. If the to-be-advertised network and the interface on which it has to be transmitted on, has same major networks and masks, then it sends the subnet.
2. If the to-be-advertised network and the interface on which it has to be transmitted on, has same major networks but different masks, then the router will drop the update.
3. If the to-be-advertised network and the interface on which it has to be transmitted on, has different major networks, then, the router sends the the major network alone/summarized route.

Receiving routing updates manipulating rules :

1. If the major network of the received updated and the interface on which it is received has same major network, then it assumes the mask of that interface.
2. If the major network of the received update and the interface on which it is received has different major network, then the router assumes the default mask .

· When a router received the update, it first stores in the router, then increments the metric by 1 and send it to the neighbor.