What is the AD value of EIGRP, OSPF, RIP and BGP?
The Administrative Distance (AD) is a value used by routers to determine the preferred route when multiple routing protocols provide different paths to the same destination.
Here are the default Administrative Distance values for commonly used routing protocols :
1. EIGRP (Enhanced Interior Gateway Routing Protocol) :
* Internal EIGRP route: 90
* External EIGRP route: 170
2. OSPF (Open Shortest Path First) :
* Intra-area route: 110
* Inter-area route: 110
* External route (redistributed into OSPF): 110
3. RIP (Routing Information Protocol) :
* RIP version 1: 120
* RIP version 2: 120
4. BGP (Border Gateway Protocol) :
* External BGP (eBGP) route: 20
* Internal BGP (iBGP) route: 200
These values represent the default AD values assigned by the routing protocols. It's important to note that these values can be manually adjusted in router configurations if desired, allowing network administrators to influence the preferred routing paths. Lower AD values indicate a higher preference for a particular route.
