What is the administrative distance value used for EIGRP?

EIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco proprietary routing protocol that is commonly used in computer networks. Like other routing protocols, EIGRP assigns a metric value to each route it knows about, which helps determine the best path for data to travel from one network to another. However, in addition to the metric, EIGRP also uses a concept known as administrative distance.

What is administrative distance?

Administrative distance is a numerical value used in routing protocols like EIGRP to determine the reliability or trustworthiness of a route. It represents the credibility of the source advertising the route. The smaller the administrative distance, the more reliable and preferred the route.

What is the administrative distance value used for EIGRP?

**The administrative distance value used for EIGRP is 90.** This value is assigned to routes learned through EIGRP, indicating that they are very reliable and preferred within the network. It means that EIGRP considers its own routes as the most trustworthy and preferable when compared to other routing protocols.

How is the administrative distance value determined?

The administrative distance value for each routing protocol is predetermined by the router operating system. Cisco routers assign the administrative distance value for EIGRP as 90 by default.

Can the administrative distance value be changed?

Yes, the administrative distance value can be manually changed. Network administrators have the flexibility to modify the administrative distance for EIGRP routes if desired.

What happens when routes have the same administrative distance value?

When multiple routes have the same administrative distance value, EIGRP uses the metric value to break the tie and determine the best path. The route with the lowest metric is chosen.

Are all routing protocols subject to administrative distance?

Yes, all routing protocols, including EIGRP, have an associated administrative distance value. This value allows routers to prioritize the use of routes from trusted sources when multiple routing protocols are in use.

How does administrative distance affect the routing table?

Administrative distance influences the selection and inclusion of routes in the routing table. Routers prefer the route with the lowest administrative distance, as it indicates greater reliability.

What is the default administrative distance value for other routing protocols?

The default administrative distance values for some commonly used routing protocols are as follows:
– RIP: 120
– OSPF: 110
– BGP: 20
– Static routes: 1

Can the administrative distance be different for different routing protocols?

Yes, the administrative distance value can vary for different routing protocols. Each routing protocol has its own predefined administrative distance that may or may not be modified by the network administrator.

Does administrative distance only apply to external routes?

No, administrative distance applies to both external and internal routes. It helps routers determine the best path within the local network as well as beyond.

What happens if a router receives multiple routes with the same administrative distance from different sources?

If a router receives multiple routes with the same administrative distance, it will load-balance the traffic across these routes. This allows for effective utilization of available paths and increases network redundancy.

Which takes precedence – administrative distance or routing protocol cost?

Administrative distance takes precedence over routing protocol cost. If routes with different administrative distance values have equal metrics, the route with the lowest administrative distance will be preferred.

In conclusion, the administrative distance value used for EIGRP is 90. It plays a vital role in determining the credibility and preference of routes within a network. By understanding administrative distance and its significance, network administrators can effectively manage routing and make informed decisions about network traffic.

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