An administrative distance when two or more routing protocol configure in the network for transmitting data source to destination. An administrative destination defines which route or routing protocol will be best to transmit data. Lower the value higher the priority. The administrative value is 0 to 225. We can say that administrative distance is “Trust-Worthiness of Routing Protocols.” The routing protocols have some rules and commands as their own id the routing protocols are complex. Before knowing about each protocol’s administrative distance, there are some basic things that we should know. Mainly there three things that we should care about are, routing loops and distance classes of routing protocols.
Now we are going to discuss what is lies in the administrative distance?. The best answer to this question is that it is the trustworthiness od the routing information. This lie depends on some protocols or the methods that are learned by the router. Now we are going to study about the exact topic, administrative distance. It can be clearly defined as it is the trustworthiness of the routes that telling to the routers, and all the protocols have this administrative distance. This value can be from 0 to 225 with a lower value being better. As we mentioned above, each protocol has it is on administrative distance and this value is assigned by default.
Consider a situation that there only one single protocol that is running on all the routers, there would be many paths to the remote network. The path chosen to transfer the routing information is by choosing the best path for the best output. This choice is based on the or it depends on the metric. We can use the metrics to represent the routes to the destination from the host if there are multiple routing paths present.
The router can use the administrative destination if the router has many routes presented to the destination. By using the administrative destination it can decide which path should be taken and inserted into the routing table. If a router wants to send a packet, then the routes do the following thing. It first checks the routing table and uses the longest match prefix route. If a router learned about the same route, from multiple sources, which route is going select fast. Or administrative distance is the trustworthiness of keeping routing information from it a neighbor router.
The following are some points of administrative distance
- Firstly integral part of how Cisco routers work.
- The second point is that Not all routers use the same terminology or technology.
- A predefined set of precedence numbers, known as Administrative distance.
- The most important one is to Qualifies how believable a learned router is.
- The fourth point is, The lower the number, the more believable the route.
- The reliability of the protocols used for routing can be determined using the administrative distance.
- It can refer to using the abbreviation AD.
- If AD is small, it can be trusted more by the router.
- Best AD distance:0-255.
- The best path can be determined by this, if there are multiple routes are presented to a single destination.
- Finally, EIGRP is much more sensitive to line conditions and has a lower number.
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