Cisco command about IP Address and IP Router

IP Address Command:

Router(config)# interface ethernet 0(configure IP address)
Router(config-if)# ip address “IP address” “subnet address”
Router(config-if)# no shutdown
Router(config-if)# exit

Router# show interfaces ethernet 0 (verify the setting of IP address)
Router# show ip interface (show all setting of IP address in layer-3 in details)
Router# show ip interface brief (show only the interfaces line state and protocol state are up or down, and also the corresponding ip address)

Router on a Stick:

Router(config)# interface fastethernet 0/0
Router(config-if)# no shutdown
Router(config-if)# exit
Router(config)# interface fastethernet 0/0.10 point (point-to-point serial link)
Or
Router(config)# interface fastethernet 0/0.10 multipoint (routing between multiple VLANs: trunk connection)

Router(config-subif)# encapsulation isl 1 (Cisco ISL with VLAN 1)
Or
Router(config-subif)# encapsulation dot1q (IEEE 802.1q with VLAN 1)
Router(config-subif)# ip address “IP address” “subnet address”
Router(config-subif)# exit

Router(config-if)# ip directed-broadcast (enable forward directed broadcasts)
Router(config-if)# no ip directed-broadcast (disable forward directed broadcasts)

Change the display format of IP Address (every time log into the router):

Router# term ip netmask-format bit-count | decimal | hexadecimal

Change the display format of IP Address (permanent):

Router(config)# line console | auxiliary | vty “line #”
Router(config-line)# ip netmask-format bit-count | decimal | hexadecimal

To define a DNS:

Router(config)# ip name-server “IP address of server” [“2nd server’s IP address…]

Router(config)# no ip domain-lookup (to disable DNS lookup)

Router(config)# show host (to see the DNS entries)

Configuring Static Routes:

Router(config)# ip route “IP Address” “Subnet mask” “interface to exit” [“administrative distance”] [permanent] (permanent will keep the static route in routing table)

To setup default route (it is used to forward the packet if the destination is not known)

Router(config)#: ip route 0.0.0.0.0.0.0.0 “interface to exit” [“administrative distance”] [permanent]

Router(config)# ip classless (define as a variable length subnet mask)

Router Command:

Router(config)# router “Name of the IP routing protocol”
Router(config-router)#(enter the Router Configuration mode)

Router(config-router)# network “IP network #” (defines which interface will be participating in the routing protocol)

Router(config)# router rip (example, configuring IP RIP)
Router(config-router)# network 172.16.0.0 (remember rip and igrp are classful)

Router# show ip protocols (display the IP routing protocols that have been configured and are running on your router)

Router# show ip route (see the list of paths to destination in a routing table)
Router# debug ip rip (see more detailed troubleshooting of IP RIP problem)

Router(config)# router igrp 100 (configuring IP IGRP with autonomous system number 100)
Router(config-router)# network “IP network #”

Router(config-router)# variance “multiplier” (1 for equal-cost path)
Router(config-router )# traffic-share balanced
Or
Router(config-router)# traffic-share min across-interfaces

Router# clear ip route (clear the routing table)

Router# debug ip igrp transactions (see the routing updates receive / send in details)
Router# debug ip igrp events (see the routing updates receive / send in summary)

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