Introduction to Cisco Routers and Switches

Willis Kim

8 October 2005

Terminology

Routers make decision on the flow of network traffic

Switch – joins multiple devices from the same network

Terminology (con’t) An IP address is the logical address of a

network adapter. The IP address uniquely identifies computers on a network.

An IP address can be private, for use on a LAN, or public, for use on the Internet or other WAN. IP addresses can be determined statically (assigned to a computer by a system administrator) or dynamically (assigned by another device on the network on demand).

IP Addressing

Class A = 1-126 * . H . H . H

Class B = 128-191 . N . H . H

Class C = 192-223 . N . N . H

* IP addresses beginning with 0 and 127 are reserved. IP Addresses in the range of 10.H.H.H, 172.16-31.H.H, and 192.168.x.H are reserved for private use and are not assigned.

Subnet

Building networks

Topology, interface and configuration diagrams are essential before starting

Know where you are going so you know when you get there!

Network diagram

VDSL via POTS

Seoulcc Wireless Router 802.11b/g

192.168.1.1 (gateway)

VDSL modemWireless Bridge 802.11b192.168.1.50 (mgt only)

Linksys Wireless Router 802.11b/g

192.168.1.2 (gateway)

Cisco 2611 routerWith DHCP

Catalyst 3500XL Switch VLAN1 192.168.200.5

192.168.100.2 Ethernet 0/0

`

DHCP, 192.168.200.x

192.168.200.1 Ethernet 0/1

192.168.100.1

Voice over IP phone192.168.15.1

Subnet 1.x

Subnet 100.x

Subnet200.x

Subnet 15.x

Configuring the router (Command-line)

Use HyperTerminal Private Edition Settings 9600, 8-N-1, hardware Initial configuration using serial

terminal and 180° cisco cable into console port

Unprivileged and privileged modes Router> to Router# (all

configurations)

Configuring the router (con’t) Router#show interfaces

Ethernet0/0 is up, line protocol is up Hardware is AmdP2, address is 0050.3ee4.1100 (bia 0050.3ee4.1100) Internet address is 192.168.100.2/24 MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set …. 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 27399 packets input, 6250892 bytes, 0 no buffer Received 2650 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 input packets with dribble condition detected 30322 packets output, 5415946 bytes, 0 underruns 102 output errors, 25 collisions, 3 interface resets 0 babbles, 0 late collision, 195 deferred 102 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out

Configuring the router (con’t) Router#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route

Gateway of last resort is 192.168.100.1 to network 0.0.0.0

C 192.168.200.0/24 is directly connected, Ethernet0/1C 192.168.100.0/24 is directly connected, Ethernet0/0S* 0.0.0.0/0 [1/0] via 192.168.100.1

Configuring the router (con’t) Global configuration

For example - Hostname, name-server, privilege password

Configuring interfacesinterface Ethernet0/0 ip address 192.168.100.2 255.255.255.0 half-duplex!interface Ethernet0/1 ip address 192.168.200.1 255.255.255.0 half-duplex

Configuring the router (con’t)

Configuring DHCPip dhcp excluded-address

192.168.200.1 192.168.200.100!ip dhcp pool demonstration network 192.168.200.0 255.255.255.0 dns-server 168.126.63.1 168.126.63.2 default-router 192.168.200.1

Configuring the router (con’t)

Routing Static vs. Dynamic Stub network - staticip route 0.0.0.0 0.0.0.0 192.168.100.1ip route 192.168.200.0 255.255.255.0

192.168.200.2

Configuring the router (con’t) Saving your configuration

ExampleName#show running-config You do want to save your successful running configuration. Issue the command copy running-config startup-config.

ExampleName#copy running-config startup-config Your configuration is now saved to non-volatile RAM (NVRAM). Issue the command show startup-config.

ExampleName#show startup-configNow any time you need to return your router to that configuration, issue the command copy startup-config running-config.

ExampleName#copy startup-config running-config

Configuring the switch

VLAN1 is associate with all ports Assign an IP addressinterface VLAN1 ip address 192.168.200.2

255.255.255.0

Configuring the Linksys router

Internet IP - 192.168.1.2

Gateway – 192.168.1.1

Local IP - 192.168.100.1

Gateway – 192.168.1.2

What is missing?

Testing connectivity ping from nearest to farthest traceroute

What is missing?

Static routes back from the Linksys router (200.x and 15.x)

Static routes back from the Seoulcc router (200.x, 100.x and 15.x)

Questions

7dBi Annenta

Ximeta - Network Storage

Netdisk 250GB using NDAS For Local Area Network (Ethernet)