DCN adjusts the administrative distance of the routing protocol

Route source Administrative distance

direct route 0

static route 1

DEIGRP summary route 5

External BGP 20

Internal BEIGRP 90

OSPF                  110

IS-IS                    115

RIPV1、RIPV2 120

External BEIGRP 170

Internal BGP 200

unknown 255

AD (administrate distance), that is to say, it is used to judge the credibility of this route.
The default AD is 90 for EIGRP, 100 for IGRP, 110 for OSPF, 120 for RIP, 0 for direct connections, and 1 for static routes. The maximum value of AD is 255, the smaller the value, the higher the reliability.

network first