Routing

Cisco Router Basic Configuration Reference

Basic Global Configuration

Command example

enable configure terminal no hostname rtr1 ip domain-name ip name-server 8.8.8.8 8.8.4.4 no ip-domain lookup service password-encryption enable secret user password line vty 0 4 transport input ssh login authentication default transport preferred none crypto key generate rsa modulus 2048 ip ssh time-out 120 ip ssh authentication-retries 3 ip ssh version 2 no ip http server access-list 99 permit 10.10.0.0 0.0.0.255 end or CTRL-Z ipv6 unicast-routing write memory show running-config show startup-config

Description

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 Set password to enter privileged exec (enable) mode Create user and set its password (different from enable) Configure first 5 virtual terminals Use SSH, disable telnet Enable password checking and use the default authentication list Don't interpret bad commands as hostnames Create a 2048-bit RSA key for SSH encryption Specify timeout interval for SSH connections in seconds Limit number of authentication retries to 3 Only support version 2 of the SSH protocol Disable HTTP interface Only allow hosts in 10.10.0.0/24. Must be applied somewhere else 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 example

interface FastEthernet0/0 description Local Network ip address 10.2.3.4 255.255.255.0 ip access-group no ip proxy-arp no ip redirects no ip directed-broadcast ipv6 enable ipv6 address 2001:DB8::A::1/64 no shutdown exit end show running interface Fast0/0

Description

Select an interface to configure Provide a description for this interface Configure IPv4 address and subnet mask Apply access-list to traffic going...