Cisco CCNA CCNP Certification Introduction To BGP Attributes

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Cisco CCNA and CCNP Certification: An Introduction to BGP Attributes


Summary


Tackling BGP (Border Gateway Protocol) can be daunting during your CCNP studies. However, breaking it down into fundamental concepts can make it more manageable. This tutorial, crafted by Chris Bryant, CCIE

12933, aims to simplify BGP attributes and help you excel in your exams.


Understanding BGP Attributes


BGP is often considered one of the most complicated subjects in the CCNP curriculum. From my own experience, it was the most challenging part. However, remember that no Cisco technology is insurmountable if you focus on the basics before moving on to complex configurations.

Overview of BGP Attributes


BGP attributes play a crucial role in routing decisions, similar to how metrics function in OSPF, RIP, IGRP, and EIGRP. Although not visible in the routing table, these attributes help BGP select the best path when multiple loop-free options exist.

Here’s the order in which BGP evaluates these attributes:

1. Highest Weight: A Cisco-proprietary value.
2. Highest Local Preference (LOCAL_PREF)
3. Prefer Locally Originated Routes
4. Shortest AS_PATH
5. Lowest Origin Code: Internal paths are favored over external ones, while external paths are preferred over routes with an "incomplete" origin.
6. Lowest Multi-Exit Discriminator (MED)
7. External BGP Routes over Internal BGP Routes
8. Lowest IGP Cost to the Next-Hop Router for iBGP: If no external route is available.
9. Most Recent Route
10. Lowest BGP Router ID (RID)

Don't worry if you’re unfamiliar with these terms or configurations. The following sections of this BGP tutorial will delve into each attribute thoroughly. Start by familiarizing yourself with this order, and stay tuned for part II, where we’ll explore these values in detail. Keep studying and mastering BGP!

You can find the original non-AI version of this article here: Cisco CCNA CCNP Certification Introduction To BGP Attributes.

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