CCIE R&S Written Overview: IPv4 Overview

IPv4 Routing Protocols Overview

• Static Routing

• RIPv2

• EIGRP

• OSPF

• BGP

• Policy Routing

• IP Tunneling

IP Routing Overview

• Longest Match Routing (Highest number of bits matching destination route/Most specific subnet)

• Metric vs. Distance

– Same protocol vs. different protocols

Administrative Distance Reference

Connected 0
Static 1
EIGRP Summary 5
External BGP 20
Internal EIGRP 90
IGRP* 100
OSPF 110
IS-IS 115
RIP 120
EGP* 140
ODR 160
External EIGRP 170
Internal BGP 200
Infinite 255 *Deprecated