book

Cisco Routers for the Desperate, 2nd Edition

by Michael W. Lucas

March 2009

Beginner to intermediate

144 pages

3h 13m

English

No Starch Press

Read now

Unlock full access

What This Book Will Teach You
Console SetupOther Router PortsPower-On
EXEC versus Privileged EXEC Mode
Running versus StartupStartup ConfigurationRunning Configuration
Configuring the RouterConfiguring a Particular InterfaceSaving ChangesBacking Up Router Configurations
Got Interface?

Configuring Ethernet InterfacesDescriptionduplexspeedDisabling Broadcast PingsMulticast Routing Cache
Configuring Serial Interfaces
Loopback InterfacesNull Interfaces
Internet ConnectionsChoosing an ISPISP Router Configuration
Choosing EquipmentOrdering CircuitsWho Installs the Circuit?Data or Voice Circuit?
Private Circuit IP AddressesReserved AddressesSubnettingRouting ConfigurationStatic RoutingRemote Office RoutingHeadquarters RoutingPlugging It All Together
Router Crashes
Initial Circuit TestspingtracerouteCircuit DesignThe SmartjackExamining the CircuitResetting the InterfaceRebooting the RouterNothing Worked!Interface Debugging InformationInput/Output RatesTypes of ErrorsUsing Carrier Transition to Detect a Bad Serial Connection
Circuit Loopback TestsIf It's Your Problem
Cisco Security Notifications
IOS VersionsChoosing Your IOS VersionFind the Current IOS ImageViewing Disk ContentsCopying FilesCopying Files over FTPCopying Files over SCPCopying Your Configuration to a File Server
IOS InstallationManaging Multiple IOS ImagesDisaster Recovery
BGP BasicsWhat BGP Isn't
Router FeaturesISPs with BGPIP AddressesGetting an ASNRouting Registries
Your Address AnnouncementsConfiguring Addresses for AnnouncementConfiguring BGPYour First NeighborRoute MapsA Complete BGP Configuration
Viewing RoutesResetting BGPLoad Balancing BGP
What Is HSRP?Tuning HSRPPreemptionInterface TrackingHSRP DelayAuthenticationBGP and HSRPTesting HSRP
CatOS, IOS, and Hybrid Mode
CDP Security
Viewing MAC AddressesFinding Host Connections
Lines
Making Lines Check Usernames
Enabling TelnetEnabling SSH
Cisco AutoSecure
Basics of NTPConfiguring NTPChecking NTP
Local LoggingSyslog Basics
What Is an IP Address?

Content preview from Cisco Routers for the Desperate, 2nd Edition

BGP Preparations

To run BGP, you must have the following:

A router with at least 512MB of RAM
Two ISPs, both willing to provide you with a BGP feed
An IOS version that supports BGP version 4
A block of IP addresses /24 or larger—several smaller chunks that add up to a /24 are useless for BGP
An Autonomous System Number
A routing registry entry for your network block

We'll look at each in turn.

Router Features

Let's dispose of the easy requirement first. Your router must have an IOS image that supports BGP. If your IOS doesn't support BGP, use your SmartNet contract to get a version that does.

Memory is a little more problematic. Each route announcement from a peer takes up a little bit of memory. When you are receiving full routes from two peers, your routing ...