When two routing sources offer the same prefix, AD picks the source. Within one source, the metric picks the best path. This chapter gives the standard AD table and explains the metric used by each protocol.
| Source | AD |
|---|---|
| Connected | 0 |
| Static | 1 |
| EIGRP summary | 5 |
| External BGP | 20 |
| EIGRP internal | 90 |
| IGRP | 100 |
| OSPF | 110 |
| IS-IS | 115 |
| RIP | 120 |
| EIGRP external | 170 |
| Internal BGP | 200 |
| Unreachable | 255 |
You can see the title, summary, learning objectives and the opening sections. The rest of this chapter, like all of modules 2–8, comes with the Course & Lab Pass and All-Access Max. A free account opens Module 1: Network Foundations end-to-end and saves your labs — start there, no card required.
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