EIGRP Part1 | Basics of EIGRP | Hybrid Protocol | Network Zeal
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Enhanced Interior Gateway Routing Protocol
Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco proprietary routing protocol used for routing data across networks. It falls under the category of advanced distance-vector protocols but incorporates elements of link-state protocols as well. EIGRP was designed to provide rapid convergence, efficient use of bandwidth, and scalability for large networks. Here are some key features and aspects of EIGRP:
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1. *Hybrid Protocol:* EIGRP combines aspects of both distance-vector and link-state protocols. It uses the Diffusing Update Algorithm (DUAL) to calculate routes, which helps in achieving faster convergence compared to traditional distance-vector protocols.
2. *Metric Calculation:* EIGRP uses a composite metric to determine the best path to a destination. This metric takes into account factors such as bandwidth, delay, reliability, load, and MTU (Maximum Transmission Unit) of links. The formula for the metric calculation is proprietary to Cisco.
3. *Neighbor Discovery:* EIGRP routers establish neighbor relationships to exchange routing information. These relationships help in sharing updates efficiently and maintaining network stability.
4. *Feasible Successor:* EIGRP keeps backup routes, called feasible successors, to quickly recover from link failures and reduce convergence time. This contributes to network resiliency.
5. *Triggered Updates:* EIGRP sends updates only when there is a change in the network topology, reducing the amount of routing traffic and conserving bandwidth.
6. *Partial Updates:* EIGRP only sends the portion of the routing table that has changed, which minimizes the amount of data transmitted during updates.
7. *Authentication:* EIGRP supports authentication between routers to ensure that only authorized routers can participate in the routing updates.
8. *VLSM and CIDR Support:* EIGRP supports Variable Length Subnet Masking (VLSM) and Classless Inter-Domain Routing (CIDR), allowing for efficient utilization of IP address space.
9. *Automatic Summarization:* By default, EIGRP performs automatic summarization at network class boundaries. This can be disabled to allow more specific routing information to be advertised.
10. *Administrative Distance:* EIGRP has an administrative distance of 90, making it more preferable than certain other routing protocols like RIP (120) and OSPF (110).
11. *Stub Routing:* EIGRP supports stub routing, which allows you to configure certain routers in the network to act as stub routers, reducing the complexity of routing tables and conserving resources.
12. *Route Filtering and Redistribution:* EIGRP supports route filtering and redistribution of routes from other routing protocols, making it adaptable to various network environments.
It's important to note that EIGRP is a Cisco-proprietary protocol and primarily used within Cisco networking equipment. While it has been widely used in Cisco networks, other open-standard protocols like OSPF (Open Shortest Path First) and BGP (Border Gateway Protocol) are more commonly used in heterogeneous networking environments.
@RajeevPrashar @NetworkZeal
instagram.com/prasharr - DM me if you need any specific Networking Video
1. *Hybrid Protocol:* EIGRP combines aspects of both distance-vector and link-state protocols. It uses the Diffusing Update Algorithm (DUAL) to calculate routes, which helps in achieving faster convergence compared to traditional distance-vector protocols.
2. *Metric Calculation:* EIGRP uses a composite metric to determine the best path to a destination. This metric takes into account factors such as bandwidth, delay, reliability, load, and MTU (Maximum Transmission Unit) of links. The formula for the metric calculation is proprietary to Cisco.
3. *Neighbor Discovery:* EIGRP routers establish neighbor relationships to exchange routing information. These relationships help in sharing updates efficiently and maintaining network stability.
4. *Feasible Successor:* EIGRP keeps backup routes, called feasible successors, to quickly recover from link failures and reduce convergence time. This contributes to network resiliency.
5. *Triggered Updates:* EIGRP sends updates only when there is a change in the network topology, reducing the amount of routing traffic and conserving bandwidth.
6. *Partial Updates:* EIGRP only sends the portion of the routing table that has changed, which minimizes the amount of data transmitted during updates.
7. *Authentication:* EIGRP supports authentication between routers to ensure that only authorized routers can participate in the routing updates.
8. *VLSM and CIDR Support:* EIGRP supports Variable Length Subnet Masking (VLSM) and Classless Inter-Domain Routing (CIDR), allowing for efficient utilization of IP address space.
9. *Automatic Summarization:* By default, EIGRP performs automatic summarization at network class boundaries. This can be disabled to allow more specific routing information to be advertised.
10. *Administrative Distance:* EIGRP has an administrative distance of 90, making it more preferable than certain other routing protocols like RIP (120) and OSPF (110).
11. *Stub Routing:* EIGRP supports stub routing, which allows you to configure certain routers in the network to act as stub routers, reducing the complexity of routing tables and conserving resources.
12. *Route Filtering and Redistribution:* EIGRP supports route filtering and redistribution of routes from other routing protocols, making it adaptable to various network environments.
It's important to note that EIGRP is a Cisco-proprietary protocol and primarily used within Cisco networking equipment. While it has been widely used in Cisco networks, other open-standard protocols like OSPF (Open Shortest Path First) and BGP (Border Gateway Protocol) are more commonly used in heterogeneous networking environments.
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