Why rip hop count is 15

Figure 2 shows an example of the split horizon technique. In this example, Router A can reach Router C in 2 hops. However, the advertisement from Router B to Router A is unnecessary, because Router A can already reach the route in 2 hops. The split horizon technique helps reduce extra traffic by eliminating this type of route advertisement.

Similarly, the poison reverse technique helps to optimize the transmission of routing information and improve the time to reach network convergence. If Router A learns about unreachable routes through one of its interfaces, it advertises those routes as unreachable hop count of 16 out the same interface.

Figure 3 shows an example of the poison reverse technique. Router A readvertises those routes out the same interface as unreachable. Because RIP processes routing information based solely on the receipt of routing table updates, it cannot ensure bidirectional connectivity.

As Figure 4 shows, RIP networks are limited by their unidirectional connectivity. Because the path to Router E has the fewest hops when routed through Router A, that route is imported into Router B's forwarding table. However, suppose that Router A can transmit traffic but is not receiving traffic from Router B because of an unavailable link or invalid routing policy.

If the only route to Router E is through Router A, any traffic destined for Router A is lost, because bidirectional connectivity was never established. The Routing Information Protocol next generation RIPng is an interior gateway protocol IGP that uses a distance-vector algorithm to determine the best route to a destination, using hop count as the metric.

RIPng is disabled by default. On devices in secure context, IPv6 is disabled. RIPng allows hosts and routers to exchange information for computing routes through an IP-based network. RIPng is prone to routing loops when the routing tables are reconstructed. Especially when RIPng is implemented in large networks that consist of several hundred routers, RIPng might take an extremely long time to resolve routing loops.

RIPng uses only a fixed metric to select a route. Response messages are sent periodically or when a request message is received. Update messages contain the command and version fields and a set of destinations and metrics.

Version number—Specifies the version of RIPng that the originating router is running. This is currently set to Version 1. The rest of the RIPng packet contains a list of routing table entries consisting of the following fields:. Route tag—A route attribute that must be advertised and redistributed with the route.

Help us improve your experience. Let us know what you think. Do you have time for a two-minute survey? Maybe Later. RIP Overview RIP is an interior gateway protocol IGP that uses a distance-vector algorithm to determine the best route to a destination, using the hop count as the metric.

Distance-Vector Routing Protocols Distance-vector routing protocols transmit routing information that includes a distance vector, typically expressed as the number of hops to the destination.

Figure 1: Distance-Vector Protocol. Now the RIP will select route 1 though it has high traffic its bandwidth is much less than the bandwidth of route 2. This is one of the biggest disadvantages of RIP. Do share this blog with your friends to spread the knowledge. Visit our YouTube channel for more content. You can read more blogs from here.

Admin AfterAcademy 10 Feb Share this blog and spread the knowledge. Share On Facebook. Share On Twitter. Share On LinkedIn. Share On Telegram. Share On Reddit. Share On WhatsApp. Stay up to date. Updates routing information are always broadcast. Full routing tables are sent in updates. Routers always trust routing information received from neighbor routers.

This is also known as Routing on rumours. RIP v2 is known as Classless Routing Protocol because it sends information of subnet mask in its routing update.

R1 has IP address R2 has IP address R3 has IP address Skip to content. Change Language. Related Articles. Computer Network Fundamentals. Physical layer. Data Link layer. Network layer.