Routing information protocol updating algorithm
It defines how long an entry can keep being valid in the routing table without being refreshed.When the router invalid timer expires, the hop count of the entry is set to cost infinity (16), marking the destination as unreachable.RIP, depending on the implementation, includes split horizon, route poisoning and path hold down mechanisms to limit propagation of incorrect routing information.RIP is suitable for small, stable and homogeneous networks: It is tried to be avoided by not resetting the routing update timer on sending a triggered update and by sending gratuitous Response messages with a variable delay between 25 and 35 seconds.It defines how long an entry is not subject to changes following a suspected start of count of infinity.
Access to this mesh cloud is dependent on the radio nodes working in harmony with each other to create a radio network. When one node can no longer operate, the rest of the nodes can still communicate with each other, directly or through one or more intermediate nodes.A stratagem can be adopted to make version 1 of RIP work in networks with variable-length netmask addresses: given an announced network address, the router scans the network addresses assigned to its connected interfaces: RIP defines the hop count limit equal to 16 → destinations whose distance is larger than 15 are considered unreachable.Such a low maximum value was chosen to limit the well-known problem of count to infinity of DV-based algorithms: when a route cost reaches value 16, the route is considered unreachable and its cost can not rise even more.In a wireless mesh network, topology tends to be more static, so that routes computation can converge and delivery of data to their destinations can occur.Hence, this is a low-mobility centralized form of wireless ad hoc network.
This does mean that the network can not have more than 15 routers in a cascade: the only effect is that two routers too far away can not communicate directly one with each other.