Cisco Router Basic Configuration Reference PDF

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Cisco Router Basic Configuration Reference

Basic Global Configuration

Command exampleDescription

enable

Enter Privileged Exec mode

configure terminal

Enter configuration mode

Negate or remove a command

hostname rtr1

Set router name

ip domain-name

Assign a default DNS domain

ip name-server 8.8.8.8 8.8.4.4

Assign a list of DNS servers

no ip-domain lookup

Or Disable DNS entirely (your choice)

service password-encryption

Encrypt system passwords

enable secret Set password to enter privileged exec (enable) mode user password Create user and set its password (different from enable) line vty 0 4

Configure first 5 virtual terminals

transport input ssh

Use SSH, disable telnet

Don't interpret bad commands as hostnames

crypto key generate rsa modulus 2048

Create a 2048-bit RSA key for SSH encryption

ip ssh time-out 120 Specify timeout interval for SSH connections in seconds ip ssh authentication-retries 3

Limit number of authentication retries to 3

ip ssh version 2

Only support version 2 of the SSH protocol

no ip http server

Disable HTTP interface

access-list 99 permit 10.10.0.0

0.0.0.255

Only allow hosts in 10.10.0.0/24. Must be applied somewhere else end or CTRL-Z

Leave configuration mode

ipv6 unicast-routing write memory

Save configuration to non-volatile RAM

show running-config

Show current operating configuration

show startup-config

Show config that is saved in non-volatile RAM

Interface Configuration

Command exampleDescription

interface FastEthernet0/0

Select an interface to configure

description Local Network

Provide a description for this interface

ip address 10.2.3.4 255.255.255.0

Configure IPv4 address and subnet mask

ip access-group Apply access-list to traffic going into/out of this interface no ip proxy-arp

Disable Proxy ARP

no ip redirects

Disable sending ICMP redirects on this interface

no ip directed-broadcast Disable translation of directed broadcast to physical broadcast ipv6 enable

Enable IPv6 on this interface

ipv6 address 2001:DB8::A::1/64

Configure IPv6 address

no shutdown

Activate this interface

exit

Exit interface configuration section

end

Exit configuration mode

show running interface Fast0/0

Verify interface configuration

Network Startup Resource Center - www.nsrc.org v1.0

Access Control (AAA)

Command exampleDescription

aaa new-model

Enable new access control commands and functions

aaa authentication enable default enable Allow access to privileged mode by providing enable password aaa authentication login default local group radius

Use local first, then RADIUS authentication

radius-server host 10.0.0.6

Add RADIUS server address

radius-server key MyLongSecretKey

Add RADIUS server key for encryption

Network Management

Command exampleDescription

ntp server pool.ntp.org Specify server to synchronize with using Network Time Protocol clock timezone Select your time zone, e.g. "EST" for Eastern Standard Time show clock

Verify time and date

show ntp status

Verify that clock is synchronized

snmp-server community NetManage RO 99

Set SNMP community and apply access list 99

snmp-server contact Configure contact information to be retrieved via SNMP snmp-server locaction Building A Configure location of router to be retrieved via SNMP snmp-server trap link ietf

Send SNMP traps regarding link up/down events

snmp-server enable traps envmon fan shutdown supply temperature status

Send traps for various important events

snmp-server host 10.0.0.5 version 2c

NetManage

Send SNMP version 2c traps to server using community

NetManage

cdp run

Enable Cisco Discovery Protocol

show cdp neighbors

Show neighbor devices discovered via CDP

lldp run Enable Link Layer Discovery Protocol (IEEE standard) show lldp neighbors

Show neighbor devices discovered via LLDP

logging buffered 16384 debugging

Specify buffer size and logging level

logging facility local3

Use local3 as the logging (Syslog) channel

logging trap debug

Set syslog server logging level

logging 10.0.0.5

IP address of the logging host

no logging console

Do not send logging information to console

Operation and Troubleshooting

Command exampleDescription

show ip/ipv6 interface brief Show list of interfaces with IPv4/v6 addresses and their status show interface Fast0/0

Show interface status and counters

show version

Show IOS version and other system details

show processes cpu

Show running processes and their CPU utilization

show log

Show contents of logging buffer

show ip arp

Show contents of ARP table

show ipv6 neighbors

Show IPv6 neighbor table (equivalent to ARP)

show ip route [A.B.C.D] Show IPv4 routing table, with optional network or host address show ipv6 route [X:X:X:X::X/<0-128>]

Show IPv6 routing table, with optional prefix

show environment

Display environmental status

show inventory Show inventory of physical components (line cards, etc.) Network Startup Resource Center - www.nsrc.org v1.0quotesdbs_dbs11.pdfusesText_17

[PDF] Cisco Router Basic Configuration Reference

Cisco Router Basic Configuration Reference

Basic Global Configuration

Command exampleDescription

Enter Privileged Exec mode

Enter configuration mode

Negate or remove a command

Set router name

Assign a default DNS domain

Assign a list of DNS servers

Or Disable DNS entirely (your choice)

Encrypt system passwords

Configure first 5 virtual terminals

Use SSH, disable telnet

Don't interpret bad commands as hostnames

Create a 2048-bit RSA key for SSH encryption

Limit number of authentication retries to 3

Only support version 2 of the SSH protocol

Disable HTTP interface

0.0.0.255

Leave configuration mode

Save configuration to non-volatile RAM

Show current operating configuration

Show config that is saved in non-volatile RAM

Interface Configuration

Command exampleDescription

Select an interface to configure

Provide a description for this interface

Configure IPv4 address and subnet mask

Disable Proxy ARP

Disable sending ICMP redirects on this interface

Enable IPv6 on this interface

Configure IPv6 address

Activate this interface

Exit interface configuration section

Exit configuration mode

Verify interface configuration

Access Control (AAA)

Command exampleDescription

Enable new access control commands and functions

Use local first, then RADIUS authentication

Add RADIUS server address

Add RADIUS server key for encryption

Network Management

Command exampleDescription

Verify time and date

Verify that clock is synchronized

Set SNMP community and apply access list 99

Send SNMP traps regarding link up/down events

Send traps for various important events

NetManage

NetManage

Enable Cisco Discovery Protocol

Show neighbor devices discovered via CDP

Show neighbor devices discovered via LLDP

Specify buffer size and logging level

Use local3 as the logging (Syslog) channel

Set syslog server logging level

IP address of the logging host

Do not send logging information to console

Operation and Troubleshooting

Command exampleDescription

Show interface status and counters

Show IOS version and other system details

Show running processes and their CPU utilization

Show contents of logging buffer

Show contents of ARP table

Show IPv6 neighbor table (equivalent to ARP)

Show IPv6 routing table, with optional prefix

Display environmental status