ROUTINGChapter 11

Intro to Routing & Switching

OBJECTIVES Upon completion of this chapter, you

should be able to:Configure a router with a basic

configurationConfigure a serial WAN link with a clock rateConfigure a default routeUse CDP to identify neighboring Cisco

devices

BASIC CONFIGURATION

11.1

PACKET TRACER ACTIVITY

Open up Packet Tracer & add:A PC2960 switch1841 router w/ WIC-

2T added in slot 0Ethernet & console

cables

CONFIGURE THE ROUTER

Configure: Hostname- GCC Enable password- cisco Secret password- class Con 0 & vty password-

gcit Encrypt all passwords Fa0/0 Subnet 185.17.105.0

need 5 networks; use the 1st usable for this network 1st in range for fa0/0 3rd in range for PC

SAMPLE CONFIGURATION

ADD MORE Add:

Another 1841 w/ WIC-2T in slot 0

Connect with serial DCE cable from left to right S0/0/0 to s0/0/0

Another switchAnother PCConnect with

Ethernet and console cables

CONFIGURE THE ROUTER

Configure:Hostname- GCECEnable password- ciscoSecret password- classCon 0 & vty password-

gcitEncrypt all passwordsFa0/0

2nd usable range 1st in range for fa0/0 3rd in range for PC

HOW YOU CONNECT TO ISP

Real life serial (WAN) connection to ISPYour router is a DTECSU/DSU is the DCE

Connects to ISP network Provides a clocking rate for signal

External CSU/DSU or module for router

SERIAL CABLES DB-60 to V.35 Smart Serial

CONFIGURE THE CLOCK RATE

On the serial port connected to CSU/DSUDCE

CONFIGURE CLOCK RATE

REVIEW- 5Q What is the purpose of a CSU/DSU?

Connect router to ISP & provide clock rate What kind of cable would you connect

from your router to a CSU/DSU? Smart serial to DB-60

In our class/PT, on which type of port would you configure a clock rate on? Serial

What is the command to configure the clock rate? Router(config-if)# clock rate 56000

Is your router normally a DCE or DTE? DTE

HOW TO ROUTE DATA

11.2

CONFIGURE A DEFAULT ROUTE

Router forwards packet to a destination networkLooks at routing table to see which port to

go outYou can set a default route to go out if

destination network is not in routing table

CONFIGURE DEFAULT ROUTE

Default route using outgoing

INT

Default route using outgoing

next hop IP

REVIEW- 4Q What do you configure in a router to tell it

“if you don’t have the destination network in the routing table, go this way.” Default route

What are the 2 possible commands to configure a default route? B(config)# ip route 0.0.0.0 0.0.0.0 next hop IP B(config)# ip route 0.0.0.0 0.0.0.0 outgoing

int What does the quad zero mean?

Any network (IP/SM) Which command encrypts all passwords?

Service password-encryption

CISCO DISCOVERY PROTOCOL

11.3

CISCO DISCOVERY PROTOCOL- CDP

Shares info between directly connected Cisco devices (neighbors) Runs on boot Sends periodic CDP advertisements, every 60 sec. Operate at Layer 2

Information gathered by CDP includes: Device host name Layer 3 addresses What the directly connected port is, “serial 0/0/0” Capabilities list – Router, Switch Platform, for example Cisco 1841

SHOW CDP NEIGHBORS

SHOW CDP NEIGHBORS DETAIL

DISABLING CDP Why disable it?

PT 5.4.4.5

OTHER CDP COMMANDS

Show cdp interfaceVerify frequency sentP2R3#show cdp interfaceFastEthernet0/0 is up, line protocol is upencapsulation ARPASending CDP packets every 60 secondsHoldtime is 180 seconds

REVIEW- Q What layer does CDP operate at?

Layer 2 How often do CDP advertisements get

sent?60 seconds

What does CDP do?Discover neighboring Cisco devices

What command displays the table of neighboring devices?B# show cdp neigbors

REVIEW- Q What command turns CDP off for the

router?B(config)# no cdp run

Why would you turn CDP off?Neighbors aren’t Cisco devices

Your Cisco router connects to a 3Com switch on Fa0/0 and a Cisco router on S0/0/0. What command will make the router not exchange CDP advertisements to the switch?B(config-if)# no cdp enable

REVIEW- Q Identify what each category in the table

means.

SUMMARY You configured a router with basic

settings. You know how a router connects to an

ISP with a CSU/DSU. You can identify DCE and DTE devices. You know which cable connects from the

router to the CSU/DSU. You can configure a clock rate on a

serial interface. You can configure a default route and

know why you should configure one.

SUMMARY You know the purpose of CDP and

how/when it is used. You can read a CDP table and can

backwards design the network based on the output.

You know which command is used to display the CDP table and the detailed output.

You can turn CDP off on the router and on the interface.

REVIEW & STUDY Complete the study guide handout

Take the quiz on netacad.com

Jeopardy review

ROUTINGChapter 11

Intro to Routing & Switching