Date of Issue: 11-18-2002 Rate this Study Guide

CCNA IP Routing

by Jason Sinclair

There's No Such Thing as Routing
    What Is a Switch, Anyway?
  Routed, Routing, and Transport Protocols
  Internet Control Message Protocol (ICMP)
What's the Problem You Are Trying to Solve?
  Broadcast Control
    How Many Broadcasts Is a Lot?
  Media Conversion
  Introducing Hierarchy
Review of "Traditional" Distance Vector Protocols
  Distance Vector Protocol Operation
    Building Network Knowledge
    Routing Update Processing
    Change in Topology
    Periodic vs. Triggered Updates
  Routing Updates
    Characteristics of Distance Vector Protocols Summarized
  Distance Vector Routing Issues
    Network Convergence
    Loop Detection and Prevention
  Routing Loop Prevention
    Split Horizon
    Poison Reverse
    Holddown Timer
    Holddown Timer
    Other Timers
    Summary of Distance Vector Pros and Cons
How Do Routes Get into the Routing Table?
    RIBs and FIBs
  Previously Unknown Route
  More Specific Route
  Lower Administrative Distance
  Load Balancing
Default Items
    Default Route
    Default Gateway
    Default Network
    Gateway of Last Resort
Summarization Issues
  The Problem -- Discontiguous Networks
    An Occasional Gotcha
    Secondary Addresses
    IP Unnumbered
  Classless Issues
    ip subnet-zero
    ip classless
    What about the Default Route?
RIPv1 Review
  RIP Routing Operation
    Note on Broadcast Impact
    Triggered Updates
  Sending and Receiving Updates
    Routing Table
    Criteria for Declaring RIP Updates Invalid
  Stability Features and Timers
    RIP Version 1 at a Glance
  RIPv1 and Subnet Masks
    Subnet Masks within RIP
IP RIPv1 Configuration on Cisco Routers
  Basic RIP Configuration: Enabling RIP
  Optional RIP Configuration Commands
    Configuring a Default Route in RIP
    Controlling Broadcasts and Multicasts
    Modifying Timers
    Applying Offsets to Routing Metrics
    Disabling Split Horizon
    RIP Version 2 at a Glance
  RIPv1 vs. RIPv2
  RIP Summarization Principles
  Basic RIPv2 Configuration on Cisco Routers
  Optional Configuration Commands
    RIP Authentication
    Controlling Support of RIP Version(s)
Advanced Distance Vector Protocols
Introduction to EIGRP
EIGRP Terminology
EIGRP Operation
  EIGRP Neighbors
  EIGRP Metrics
  EIGRP Route Selection Mechanism
  EIGRP Internal Mechanisms -- The Databases
    Neighbor Database
    Topology Database
    Tip: How to View All Routes to a Destination Learned via EIGRP
Additional EIGRP Features
  Unequal-Cost Load Balancing
  Bandwidth Use
EIGRP Limitations
  Stuck-In-Active Events
    Solving the SIA Problem
Basic EIGRP Configuration
Additional EIGRP Configuration Tasks
  Automatic Summarization
  Overriding Automatic Summarization
  Configuring Bandwidth Use
Load Balancing
  RIP and EIGRP Load Balancing -- Equal Cost
  EIGRP Unequal-Cost Load-Balancing Configuration
Conclusions and Summary

Copyright © 2002 Genium Publishing Corporation