Cisco Router

Enterprise-grade networking solutions and configuration guide

Access Methods CLI Commands
Cisco Router Interface

Default Access Methods

Default IPs

Primary: 192.168.1.1

Alternative 1: 192.168.10.1

Alternative 2: 192.168.0.1

Alternative 3: 192.168.1.254

Alternative 4: 192.168.62.1

Alternative 5: 192.168.20.1

Alternative 6: 10.0.0.1

Default Username
cisco
Default Password
cisco
Enable Password
cisco
Console Access
9600 baud rate, No parity, 8 data bits, 1 stop bit

Latest IOS Versions (2024)

ISR 4000 Series
IOS-XE 17.12.1a
ISR 1000 Series
IOS-XE 17.12.1a
Catalyst 8000
IOS-XE 17.12.1a
Small Business
RV340 Series: 1.0.03.23

Essential CLI Commands

Basic Configuration

enable
configure terminal
hostname Router
enable secret your-password
interface GigabitEthernet0/0
ip address 192.168.1.1 255.255.255.0
no shutdown
exit
ip domain-name your-domain
crypto key generate rsa
ip ssh version 2
line vty 0 4
transport input ssh
login local
exit
username admin privilege 15 secret your-password
service password-encryption

Security Configuration

access-list 100 permit ip 192.168.1.0 0.0.0.255 any
interface GigabitEthernet0/0
ip access-group 100 in
exit
ip dhcp excluded-address 192.168.1.1 192.168.1.10
ip dhcp pool LAN
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 8.8.8.8
exit

Key Features

Security

IOS Firewall, IPSec VPN, SSL VPN, Zone-Based Policy Firewall

Routing

OSPF, EIGRP, BGP, Static Routes, Policy-Based Routing

Wireless

WiFi 6 (802.11ax), Dual-band, MU-MIMO, BeamFlex+

Performance

QoS, Traffic Shaping, Application Visibility

Common Issues & Solutions

Password Recovery
  1. Break boot sequence (Ctrl+Break)
  2. Enter ROMMON mode
  3. Change configuration register
  4. Reload and reset password
Interface Issues

Commands:

show interfaces
show ip interface brief
clear counters
Memory Issues

Commands:

show processes memory
show memory summary