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
I am here to share my knowledge and experience in the field of networking with the goal being – “The more you share, the more you learn.”
I am a biotechnologist by qualification and a Network Enthusiast by interest. I developed interest in networking being in the company of a passionate Network Professional, my husband.
I am a strong believer of the fact that “learning is a constant process of discovering yourself.”
– Rashmi Bhardwaj (Author/Editor)
