CCNA, CCNA Exam, CCNA help, Cisco Certified Network Associate, CCNA study, CCNA prep

CCNA 3.2.e: Administrative distance

Overview:

Administrative distance is what is used to select the best path when a router has two different paths to the same destination via two different routing protocols.

 

Study Notes:

Show IP Route Image

  • Most routing protocols are not compatible with other protocols.
  • In a network with multiple routing protocols, being able to select the best path between multiple protocols is critical.
  • Administrative distance defines the reliability of a routing protocol.
  • Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value.
  • IPv6 uses the same distances as IPv4.
  • Default Administrative Distances:

 

Routing Protocol

Administrative Distance
Connected 0
Static 1
BGP (external) 20
EIGRP 90
IGRP 100
OSPF 110
RIP 120
BGP (internal) 200

See CCNA 3.3.a: Admin Distance for a full list


Leave a Reply

s2Member®