Google ADs
Administrative Distance
Administrative Distance (AD) is the value of reliability or trustworthiness of a protocol, for selecting routes to be placed in the routing table.
If a layer 3 device (like Router) has routes to the same destination from two different routing protocols, the route with lowest AD will be preferred and henceforth its routes will be installed in the Routing / Forwarding table.
Juniper vs Cisco –
Below comparison chart shares AD value of protocols in Cisco and Juniper platform –
PROTOCOL | CISCO | JUNIPER |
|---|---|---|
| Connected / Direct | 0 | 0 |
| Static | 1 | 5 |
| EIGRP Summary | 5 | – |
| OSPF Internal | – | 10 |
| IS-IS Level 1 Internal | – | 15 |
| IS-IS Level 2 Internal | – | 18 |
| BGP External | 20 | – |
| EIGRP Internal | 90 | – |
| OSPF All | 110 | – |
| IS-IS All | 115 | – |
| RIP | 120 | 100 |
| OSPF External | – | 150 |
| IS-IS Level 1 External | – | 160 |
| IS-IS Level 2 External | – | 165 |
| EIGRP External | 170 | – |
| BGP All | – | 170 |
| BGP Internal | 200 | – |
Watch the below given video for better understanding of Administrative distance:
ABOUT THE AUTHOR
Founder of AAR TECHNOSOLUTIONS, Rashmi is an evangelist for IT and technology. With more than 12 years in the IT ecosystem, she has been supporting multi domain functions across IT & consultancy services, in addition to Technical content making.
You can learn more about her on her linkedin profile – Rashmi Bhardwaj
