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Cisco IOS Quick Reference Cheat Sheet, Cheat Sheet of Operating Systems

Webster UniversityOperating Systems

Quick Reference Cheat Sheet on the Cisco IOS Operating Systems

Typology: Cheat Sheet

2019/2020

Uploaded on 10/09/2020

eekanath
eekanath 🇺🇸

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Cisco IOS Quick Reference Cheat Sheet 2.1
1 of 4
Cisco IOS Quick Reference Cheat Sheet 2.1
CISCO IOS QUICK REFERENCE CHEAT SHEET 2.1 .............. 1
ROUTER MODES ...................................................................... 1
QUICK START .......................................................................... 1
RESTRICT ACCESS TO ROUTER .................................................... 1
PERFORM PASSWORD ENCRYPTION SERVICE................................. 1
SETUP SSH AND DISABLE TELNET ............................................... 1
DOING THE DO COMMAND ........................................................ 1
CONFIGURATIONS: VIEW, SAVE, ERASE ....................................... 1
SDM BASIC SETUP FOR HTTP, HTTPS ........................................... 1
CONFIGURE AN INTERFACE ........................................................ 2
CONNECTIVITY ......................................................................... 2
TELNET ................................................................................... 2
DEFAULT AND STATIC ROUTES .................................................... 2
DHCP SERVER ........................................................................ 2
NAT / PAT ............................................................................ 2
PRIVILEGE LEVEL ACCOUNT ........................................................ 2
SWITCH: BASICS ....................................................................... 2
SWITCH: PORT SECURITY ........................................................... 2
SWITCH: VLAN ........................................................................ 3
SWITCH: CONFIGURE PORT AS A TRUNK PORT ............................... 3
SWITCH: VTP (VERSION 1) ........................................................ 3
INTER-VLAN ROUTING ............................................................. 3
RIP ........................................................................................ 3
BGP ....................................................................................... 3
EIGRP .................................................................................... 3
OSPF: .................................................................................... 3
ACCESS LIST: ............................................................................ 4
SEND LOGGING TO SYSLOG SERVER............................................... 4
SET CLOCK ............................................................................... 4
Router Modes
R> (User-mode prompt)
R# (Privileged-mode prompt)
R(config)# (Global configuration mode)
R(config-if)# (Interface mode)
R(config-subif)# (Sub interface mode)
R(config-line)# (Line mode)
R(config-router)# (Router configuration mode)
Quick Start
R> enable
R# config terminal
R(config)# hostname [Router1]
R(config)# exit
R#
R# ? (Help with commands)
Restrict Access to Router
Privileged-mode
R(config)# enable password [password] (Plain Text)
R(config)# enable secret [password] (Hashed)
User-mode
(Select a line)
R(config)# line console 0
R(config)# line vty 0 4
R(config)# line aux 0
R(config)# password [password]
R(config)# login
R(config)# exec-timeout [10] [0] (M, S)
Perform Password Encryption Service
R(config)# service password-encryption
Setup SSH and Disable Telnet
R(config)# ip domain-name [R1.MrCambron.com]
R(config)# crypto key generate rsa general-keys modulus
[1024]
R(config)# ip ssh time-out [180]
R(config)# ip ssh authentication-retries [2]
R(config)# line vty 0 4
R(config-line)# transport input ssh
Doing the do Command
(No need to be in R#)
R(config)# do show run
R(config)# do show int fa0/0
R(config)# do ping [172.16.0.1]
Configurations: View, Save, Erase
R# show running-config
R# show startup-config
R# copy run start (Copies run as startup-config)
R# write
R# erase start
R# reload (Reboots the router)
SDM Basic Setup for http, https
R(config)# int fa0/0
R(config-if)# ip address [10.10.10.1] [255.255.255.248]
R(config-if)# no shutdown
R(config)# ip http server
R(config)# ip http secure-server
R(config)# ip http authentication local
pf3
pf4

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Cisco IOS Quick Reference Cheat Sheet 2.

CISCO IOS QUICK REFERENCE CHEAT SHEET 2.1 ..............

ROUTER MODES ...................................................................... 1

QUICK START .......................................................................... 1

RESTRICT ACCESS TO ROUTER .................................................... 1

PERFORM PASSWORD ENCRYPTION SERVICE................................. 1

SETUP SSH AND DISABLE TELNET ............................................... 1

DOING THE DO COMMAND ........................................................ 1

CONFIGURATIONS: VIEW, SAVE, ERASE ....................................... 1

SDM BASIC SETUP FOR HTTP, HTTPS ........................................... 1

CONFIGURE AN INTERFACE ........................................................ 2

CONNECTIVITY ......................................................................... 2

TELNET ................................................................................... 2

DEFAULT AND STATIC ROUTES.................................................... 2

DHCP SERVER ........................................................................ 2

NAT / PAT ............................................................................ 2

PRIVILEGE LEVEL ACCOUNT ........................................................

SWITCH: BASICS .......................................................................

SWITCH: PORT SECURITY ...........................................................

SWITCH: VLAN ........................................................................

SWITCH: CONFIGURE PORT AS A TRUNK PORT ...............................

SWITCH: VTP (VERSION 1) ........................................................

INTER-VLAN ROUTING .............................................................

RIP ........................................................................................

BGP.......................................................................................

EIGRP....................................................................................

OSPF: ....................................................................................

ACCESS LIST: ............................................................................

SEND LOGGING TO SYSLOG SERVER...............................................

SET CLOCK ...............................................................................

Router Modes

R> (User-mode prompt) R# (Privileged-mode prompt)

R(config)# (Global configuration mode) R(config-if)# (Interface mode) R(config-subif)# (Sub interface mode) R(config-line)# (Line mode) R(config-router)# (Router configuration mode)

Quick Start

R> enable R# config terminal R(config)# hostname [Router1] R(config)# exit R# R#? (Help with commands)

Restrict Access to Router

Privileged-mode

R(config)# enable password [password] (Plain Text) R(config)# enable secret [password] (Hashed)

User-mode

(Select a line) R(config)# line console 0 R(config)# line vty 0 4 R(config)# line aux 0

R(config)# password [password] R(config)# login R(config)# exec-timeout [10] [0] (M, S)

Perform Password Encryption Service

R(config)# service password-encryption

Setup SSH and Disable Telnet

R(config)# ip domain-name [R1.MrCambron.com] R(config)# crypto key generate rsa general-keys modulus [1024] R(config)# ip ssh time-out [180] R(config)# ip ssh authentication-retries [2] R(config)# line vty 0 4 R(config-line)# transport input ssh

Doing the do Command

(No need to be in R#) R(config)# do show run R(config)# do show int fa0/ R(config)# do ping [172.16.0.1]

Configurations: View, Save, Erase

R# show running-config R# show startup-config R# copy run start (Copies run as startup-config) R# write R# erase start R# reload (Reboots the router)

SDM Basic Setup for http, https

R(config)# int fa0/ R(config-if)# ip address [10.10.10.1] [255.255.255.248] R(config-if)# no shutdown R(config)# ip http server R(config)# ip http secure-server R(config)# ip http authentication local

R(config)# username [cisco] privilege 15 password 0 [cisco] R(config)# line console 0 R(config-line)# login local R(config)# line vty 0 4 R(config-line)# privilege level 15 R(config-line)# login local R(config-line)# transport input ssh

Configure an Interface

R(config)# interface [fa0/0] R(config-if)# description [Sales VLAN] R(config-if)# ip address [192.168.1.10 255.255.255.0] R(config-if)# no shutdown R(config-if)# clock rate [64000] (only for Serial DCE)

PPP Encapsulation (Phases: LCP, Authentication, NCP)

R(config-if)# encapsulation ppp

PPP Authentication Using chap

R(config)# hostname RA RA(config)# username RB password cisco RA(config-if)# ppp authentication chap

Troubleshooting and Viewing Information

R# show controllers serial 0/0/0 (layer 1 and layer 2 info) R# show ip interface brief R# show interface (View LCP is open) R# debug ppp negotiations (PPP packets during startup phase) R# debug ppp packet (real-time PPP packet flow)

Connectivity

R# ping [172.16.0.1] R# traceroute [172.16.0.1] R# telnet [172.16.0.1] R# show interface [fa0/0] R# show ip interface [fa0/0] (layer 3)

Telnet

R> telnet 172.16.0. R1# terminal monitor (Displays console messages) R1# terminal no monitor

Default and Static Routes

R(config)# ip route [0.0.0.0 0.0.0.0 172.17.0.2] R(config)# ip route [172.18.0.0 255.255.0.0] [172.17.0.2] R# show ip route

DHCP Server

R(config)# ip dhcp pool [Pool_Name] R(dhcp-config)# network [172.16.0.0 255.255.0.0] R(dhcp-config)# dns-server [172.16.0.1 172.16.0.2] R(dhcp-config)# default-router [172.16.0.1] R(config)# ip dhcp excluded-address [172.16.0. 172.16.1.99]

NAT / PAT

NAT

R(config)# ip nat inside source static [10.10.10. 209.165.200.224] R(config)# int [fa0/0] (Inside interface) R(config-if)# ip nat inside R(config)# int [serial0/0] (Outside interface) R(config-if)# ip nat outside

Dynamic NAT

R(config)# access-list 1 permit 172.17.0.0 0.0.0. R(config)# ip nat pool pub-addr 209.165.202. 209.165.202. R(config)# ip nate inside source list 1 pool pud-addr R(config)# int fa0/ R(config)# ip address 172.17.0.1 255.255.255. R(config)# ip nat inside R(config)# int ser0/0/ R(config)# ip address 209.165.202.1 255.255.255. R(config)# ip nat outside

PAT

R(config)# access-list 1 permit 172.17.0.0 0.0.0. R(config)# ip nat inside source list 1 int ser0/0/0 overload R(config)# int fa0/0 (inside) R(config)# ip nat inside R(config)# int ser0/0/0 (outside) R(config)# ip nat outside R# show ip nat translations (Verify NAT translation)

Privilege Level Account

R(config)# username [admin] privilege 15 password 0 [cisco]

Switch: Basics

S# erase start S# delete vlan.dat S# reload S# show run S# show ip interface

Switch: Port Security

S(config)# interface fa0/18 (use this or next line) S(config)# interface range fa0/1 - 24 S(config-if)# switch port-security

Port Security Options

S(config-if)# switchport port-security mac-address [MAC: MAC_Address | Sticky: (Last Source MAC)] S(config-if)# switchport port-security maximum [Max# MAC allowed] S(config-if)# Switchport port-security violation [shutdown | restrict | protect]

Disable Port Security

S(config)# interface fa0/ S(config-if)# no switchport port-security

Troubleshoot and View Status of Port Security

R(config-if)# ip address 10.0.1.1 255.255.255. R(config-if)# ip ospf message-digest-key 10 md [area_password] R# show ip ospf? R# debug ip ospf?

Tuning Priority

R(config-if)# ip ospf priority [1-255]

Tune Router ID, Loopback Address, Int Address

R(config-router)# router-id 10.1.1.1 (Router ID) R(config-if)# ip address 10.1.1.1 255.255.255. (Loopback Address) R(config-if)# ip address 192.168.1.0 255.255.255. (Interface Address) (After changing int priority or router ID use next line) R# clear ip ospf process

Tune Reference Bandwidth

R(config-router)# auto-cost reference-bandwidth [10000] (Mbit)

Configure Interface Cost Value

R(config)# ip ospf cost

Propagating a Default Router

R(config)# ip router 0.0.0.0 0.0.0.0 serial0/0/ R(config-router)# default0information originate

Configuring OSPF Summarization

R# area 0 range 192.168.0.0 255.255.252.

Verify and Troubleshoot

R# show ip protocols R# show ip ospf? R# show ip route R# debug ip ospf?

Access List:

Standard (Place close to destination)

R(config)# access-list [1-99|1300-1999] remark [To servers] R(config)# access-list 1 [deny|permit] [source] [mask] R(config)# access-list 1 permit any R(config)# no access-list 1

Extended (Place close to source)

R(config)# access-list [100-199|2000-2699] remark [to servers] R(config)# access-list 100 [permit|deny] [tcp|ip|ospf] [source] [mask] host [destination] [mask] [eq|gt|lt] [tcp_port] R(config)# access-list 100 permit ip host 192.168.1. host 192.168.5. R(config)# access-list 100 permit tcp any host 10.10.10.250 eq 80 R(config)# access-list 101 permit tcp any any established R(config)# access-list 123 tcp host 172.16.1.2 any range ftp-data ftp

Named

R(config)# access-list [standard|extended] SALES-ONLY R(config-ext-nacl)# permit 192.168.20.0 0.0.0. R(config-ext-nacl)# permit host 192.168.10. R(config-ext-nacl)# deny any

Assign ACL to an Interface

R(config-if)# ip access-group [100] [in|out]

Assign ACL to vty

R(config-line)# access-class 1 in

Default ACL Match Tracking

R# show access-list [1|100|name] (how many matches)

ACL Console Logging

R(config)# no access-list 100 R(config)# access-list 100 permit ip host 192.168.1. 0.0.0.255 any log R(config)# access-list 100 deny ip any any log R# no logging console (turns off)

Configuring an ACL with NAT

R1(config)# int fa0/ R1(config-if)# ip address 192.168.1. R1(config-if)# ip access-group 10 in R1(config-if)# ip nat inside

R1(config)# int Ser0/0/ R1(config-if)# ip address 209.165.201. R1(config-if)# ip nat outside

R(config)# ip nat inside source list 1 int ser0/0/0 overload R(config)# access-list 10 permit 192.168.1.0 0.0.0.

Troubleshooting and Viewing ACLs

R# show access-lists (Displays all ACLs) R# clear access-list counters R# debug ip packet

Send logging to syslog server

R1# clock set 15:22:00 may 17 2007 R1(config)# clock timezone cst - R1(config)# service timestampts R1(config)# logging 192.168.1. R1(config)# no logging console

Set Clock

R# clock set 18:30:00 sep 17 2008 R# clock timezone EST -