RIP

                                         

                                 

                           Router Information Protocol (RIP)

Its distance vector routing protocol, Bellman-Ford algorithm is use.

Every 30sec its send out the periodic routing updates.

RIP metric is “Distance” & its AD value is 120.

Its use UDP-520 port, hops count upto 15hops & 16hops is considered as network unreachable.

                                     RIP Version 

RIPv1 is classful, its does not include the subnet mask with its routing table updates. Because RIPv1 does not support VLSMs.

When using RIPv1, networks must be contiguous, and subnets of a major network must be configured with identical subnet masks.

RIPv1 sends updates as broadcasts to address 255.255.255.255.

RIPv2 is classless its include the subnet mask with its routing table updates.

RIPv2 fully supports VLSMs, allowing discontiguous networks and varying subnet masks to exist.

RIP21 sends updates as Multicaste to address 224.0.0.9

                                       RIP timers

Update timer- 

The default timing for routing information being exchanged by the routers operating RIP is 30 seconds, the routers exchange their routing table periodically.

Invalid timer- 

If no update comes until 180 seconds, then the destination router consider it as invalid. In this scenario, the destination router mark hop count as 16 for that router.

Hold down timer- 

The router will wait from neighbor router to respond. If the router isn’t respond within a given time then it is declared dead, by default 180 seconds.

Flush time-

In this time route will be flushed & if it doesn’t respond within the flush time by default 60 seconds. This timer starts after the route has been declared invalid and after 60 seconds i.e time will be 180 + 60 = 240 seconds.