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

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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

Router Logging

A router knows when the equipment attached to it changes, when it has problems, and when people change its configuration. When you make changes to your router via the console, or if a circuit has a problem, you'll probably notice messages such as

%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/1, changed state to down

By default, these messages are dumped onto the console so that the administrator can figure out what is happening. If you're not staring at the console 24 hours a day, it's less than helpful. While the router can store log messages locally, it can also send these messages to another system for safekeeping. We'll start with the local logs and proceed to the more advanced remote logs.