Routing protocols use a metric called administrative distance to help determine the best routes. The lower the number the better. Here is a list of administrative distances assigned to different routing protocols:
- Directly Connected – 0
- Static Routes – 1
- EIGRP – 90
- OSPF – 110
- RIPv1 & RIPv2 – 120
- External EIGRP – 170
- Unknown or Unbelievable – 255 (an AD of 255 will not route traffic)
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