CCNA Cisco Unidad 3.2.2.2 IGP y AGP

In this blog post, we will explore the concepts of IGP (Interior Gateway Protocol) and AGP (Autonomous System Gateway Protocol) in the context of CCNA Cisco networking.

IGP and AGP are routing protocols used in computer networks, specifically within the scope of inter-domain routing. They help establish and maintain routes between different networks, ensuring efficient data transmission and network connectivity.

IGP: Interior Gateway Protocol

Interior Gateway Protocol, as the name suggests, is used within an autonomous system (AS). It provides routing information within a single AS and enables routers to exchange information and update routing tables accordingly. Some commonly used IGP protocols include:

• Routing Information Protocol (RIP)
• Open Shortest Path First (OSPF)
• Interior Border Gateway Protocol (IBGP)

RIP is a distance-vector protocol that uses hop count as a metric to determine the best path. OSPF is a link-state protocol that calculates the shortest path using the Dijkstra algorithm. IBGP is used to exchange routing information between autonomous systems.

AGP: Autonomous System Gateway Protocol

Autonomous System Gateway Protocol is an external gateway protocol used for routing between different autonomous systems. It helps connect multiple ASes together and facilitates inter-domain routing. BGP (Border Gateway Protocol) is the most commonly used AGP. It allows routers in different ASes to exchange routing information and enables routing decisions based on policies and network conditions.

BGP uses the concept of path attributes to determine the best path for routing. It takes into account factors such as AS path length, origin type, and local preference while making routing decisions. By exchanging routing information and maintaining up-to-date routing tables, BGP ensures reliable inter-domain communication.

Benefits of Using IGP and AGP

The use of IGP and AGP protocols brings several benefits to network administrators and organizations:

• Efficient routing: IGP and AGP protocols help establish optimal routes between networks, minimizing congestion and ensuring faster data transmission.
• Scalability: With the ability to handle large networks and multiple autonomous systems, IGP and AGP protocols provide scalability and flexibility for network expansion.
• Reliability: By constantly updating routing tables and exchanging routing information, IGP and AGP protocols ensure reliable network connectivity and fault tolerance in case of failures or changes in network topology.
• Policy-based routing: AGP protocols like BGP allow network administrators to define routing policies based on specific requirements, enabling traffic engineering and control over the flow of data.

Conclusion

In this blog post, we explored the concepts of IGP and AGP in the context of CCNA Cisco networking. We learned that IGP is used within an autonomous system to establish routing information, while AGP facilitates routing between different autonomous systems. Both protocols play a crucial role in ensuring efficient and reliable network connectivity. By understanding these protocols and their benefits, network administrators can design and manage robust networks that meet their organization's requirements.