Cisco IOS
Cisco Internetwork Operating System (IOS) is a family of network operating systems used on many Cisco Systems routers and current Cisco network switches
Contents
Basic commands
show version
orsh ver
(includes uptime information)show clock
Interfaces:
show interfaces
show interface link
show interface status
show interface trunk
show interfaces switchport
. To display the administrative and operational status of a switching (nonrouting) port
show configuration
orsh conf
show running-config
orsh run
An enable mode command that displays the current configurationconfigure terminal
orconf t
Logs you into configuration mode
switchport mode access|trunk
- interface Te1/0/1
show ip [OPTION]
show ip interface
show ip interface brief
orsh ip int br
enable
Logs into enable mode. Also known as user exec mode or privileged mode. See also:show privilege
enable 5
Change to level 5no enable password
show ip traffic
show tcp brief
show archive log config all
no shutdown
. Enables an interface (brings it up).
show process
ip domain lookup
no ip domain lookup
ip domain-lookup
no ip domain-lookup
ip host HOSTNAME xx.xx.xx.xx
(Similar to/etc/hosts
)
- [no]
ip forward-protocol nd
ip route-cache
no ip route-cache
include
, similar togrep
linux command
show vlan [brief | id <vlan-id> | name <name> [ifindex] | <ifindex>]
show vlan
show vlan brief
orsh vlan br
show vlan summary
orsh vlan s
show ip arp
show ip ssh
show privilege
username
Create and delete usersshow users
Access List
Configuring IP Access Lists: https://www.cisco.com/c/en/us/support/docs/security/ios-firewall/23602-confaccesslists.html#acltypes
Types of ACLs: Standard ACLs, Extended ACLs, Lock and Key (Dynamic ACLs), IP Named ACLs, Reflexive ACLs, Time-Based ACLs Using Time Ranges, Commented IP ACL Entries, Context-Based Access Control, Authentication Proxy, Turbo ACLs, Distributed Time-Based ACLs, Receive ACLs, Infrastructure Protection ACLs, Transit ACLs.
show access-list
show ip access-list
router(config)#access-list 101 deny icmp any any
router(config)#access-list 101 permit ip any any
router(config)#ip access-list extended test
router(config-ext-nacl)#permit ip host 2.2.2.2 host 3.3.3.3
router(config-ext-nacl)#permit tcp host 1.1.1.1 host 5.5.5.5 eq www
router(config-ext-nacl)#permit icmp any any
router(config-ext-nacl)#permit udp host 6.6.6.6 10.10.10.0 0.0.0.255 eq domain
ip access-group
HTTP Server
sh ip http server all
R1(config)#ip http server
R1(config)#ip http authentication local
R1(config)#ip http secure-server
Configuration Guides
Activities
- Read wikipedia article about Cisco Internetwork Operating System
- Read Cisco IOS command reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/fundamentals/command/Cisco_IOS_Configuration_Fundamentals_Command_Reference.pdf
- Read Cisco IOS Cheat Sheet: https://www.netwrix.com/cisco_commands_cheat_sheet.html
- Configure a user with public key access /Configure public RSA key authentication/
- /Associate a user with default higher privileges/ using
/username/
command
See also
- Networking: bandwidth, latency, Jitter, Ethernet, UPnP, MPLS, Frame Relay, ATM, TCP/IP, ARP, WiFi, BGP, Networking timeline, Router, Proxy ARP, Services & Networking, Traffic shapper
- Cisco IOS, PAN-OS, Junos OS, FortiOS
- OS: PAN-OS, FortiOS, SonicOS, IPFire, JunOS
- Cisco, Meraki, Cisco IOS, Cisco NX-OS, Cisco UCS, Cisco ACI, Cisco IOS XE, Cisco SD-access, AppDynamics, CCT, CCNA, CCNP, CCENT, Duo Mobile, Cisco Duo Mobile, Webex
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