Some Cisco router command configurations

Router single-arm routing configuration

• Technical Principles

• One-arm routing: is a three-layer network device router for inter-VLAN communication, which requires only one Ethernet interface, which can assume all VLAN gateways by creating sub-interfaces, while forwarding data between different VLANs.

• Experimental steps

• New Packet tracer topology diagram ()

• When the switch is set to two VLANs, it becomes logically two networks, and the broadcast is isolated. For networks of two VLANs to communicate, must pass through the router, if access to a physical port of the router, then there must be two sub-interfaces corresponding to two VLANs, but also requires that the router is connected to the port of the switch F0/1 to be set to trunk, because this port to pass through two VLAN packets.

• Check the settings to see the VLAN and trunk information correctly.

• The gateway of the computer points to the sub-interface of the router, respectively.

• Configure sub-interfaces to turn on the physical interface of the router.

• Default encapsulation is dot1q protocol;

• Configure the Router sub-interface IP address.

Cli

Switch

Switch (config) #vlan 2

Switch (Config-vlan) #exit

Switch (config) #vlan 3

Switch (Config-vlan) #exit

Switch (config) #int F0/2

Switch (config-if) #switchport Access VLAN 2

Switch (config-if) #int F0/3

Switch (config-if) #switchport Access VLAN 3

Switch (config-if) #switchport mode trunk

Router:

Router (config) #int f0/0

Router (config-if) #no sh

Router (config-if) #int f0/0.1

Router (config-subif) #encapsulation dot1q 2

Router (config-subif) #ip add 192.168.1.1 255.255.255.0

Router (config-subif) #no sh

Router (config-subif) #exit

Router (config) #int f0/0.2

Router (config-subif) #encapsulation dot1q 3

Router (config-subif) #ip add 192.168.2.1 255.255.255.0

Router (config-subif) #no shutdown

Router (config-subif) #exit

Router#show IP route//You can see that there are two routing addresses in the routing table

CODES:C-connected, s-static, I-igrp, R-rip, M-mobile, B-BGP

D-EIGRP, Ex-eigrp External, O-OSPF, IA-OSPF Inter area

N1-OSPF NSSA External Type 1, N2-OSPF NSSA external type 2

E1-OSPF external Type 1, E2-OSPF external type 2, E-EGP

I-is-is, L1-is-is level-1, L2-is-is level-2, ia-is-is Inter area

*-Candidate default, U-per-user static route, O-ODR

P-periodic downloaded static route

Gateway of last resort are not set

C 192.168.1.0/24 is directly connected, fastethernet0/0.1

C 192.168.2.0/24 is directly connected, fastethernet0/0.2

Some Cisco router command configurations