Common Routing protocol AD values

The AD values of the protocols are generally different across different vendors and care must be taken to take this fact into account in case of multi-vendor environments.

Cisco

Directly Connected Interface = 0
Static route = 1
EIGRP summary route = 5
External Border Gateway Protocol (eBGP) = 20
Enhanced Interior Gateway Routing Protocol (EIGRP) - Internal = 90
Open Shortest Path First (OSPF) = 110
Intermediate System to Intermediate System = 115
Routing Information Protocol (RIP) = 120
Enhanced Interior Gateway Routing Protocol (EIGRP) - External = 170
Internal Border Gateway Protocol (iBGP) = 200

Juniper

Directly Connected Interface = 0
Static route = 5
Intermediate System to Intermediate System - Level-1 Internal = 15
Intermediate System to Intermediate System - Level-2 Internal = 18
Routing Information Protocol (RIP) = 100
Summary Route (Aggregate route) = 130
Open Shortest Path First (OSPF) = 150
Intermediate System to Intermediate System - Level-1 External = 160
Intermediate System to Intermediate System - Level-2 External = 165
Border Gateway Protocol (BGP) = 170

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