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 = *. H. H. H Class B = N. H. H Class C = N. N. H * IP addresses beginning with 0 and 127 are reserved. IP Addresses in the range of 10.H.H.H, H.H, and 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 Subnet 1.x Subnet 100.x Subnet 200.x Subnet 15.x

Configuring the router 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 ee (bia ee4.1100) Internet address is /24 MTU 1500 bytes, BW 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 packets input, 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 packets output, 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 to network C /24 is directly connected, Ethernet0/1 C /24 is directly connected, Ethernet0/0 S* /0 [1/0] via

Configuring the router (con’t) Global configuration For example - Hostname, name-server, privilege password Configuring interfaces interface Ethernet0/0 ip address half-duplex ! interface Ethernet0/1 ip address half-duplex

Configuring the router (con’t) Configuring DHCP ip dhcp excluded-address ! ip dhcp pool demonstration network dns-server default-router

Configuring the router (con’t) Routing Static vs. Dynamic Stub network - static ip route ip route

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-config Now 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 address interface VLAN1 ip address

Configuring the Linksys router Internet IP Gateway – Local IP Gateway –

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)