Configuring Router Interfaces
Routers support both WANs and LANs thus they can interconnect multiple types of networks. Due to this, Routers support many types of interfaces.
G2 ISRs (Generation 2 Integrated Services Routers) have one or two integrated Gigabit Ethernet interfaces and HWIC (High-Speed WAN Interface Card) slots to accommodate many different types of network interfaces, like for example Cable, Serial and DLS connections/interfaces.
For an interface to become available first we will need to configure it as follows
Router Interface Configuration
Enter Global Configuration Mode
R1> enable R1# configure terminal Enter configuration commands, one per line. End with CNTL/Z.
Enter Interface Configuration Mode
R1# interface [interface-id]
Assign an IPv4 Address and a subnet mask to the interface
R1(config-if)# ip address [ip-address] [subnet-mask]
Assign an IPv6 Address and a prefix length (if applicable)
R1(config-if)# ipv6 address [ipv6 address/prefix]
Assign an IPv6 Link-Local Address (if applicable)
R1(config-if)# ipv6 address [ipv6 address/prefix] link-local
(optional) Assign a short description to the interface
R1(config-if)# description [description]
Enable the Interface
R1(config-if)# no shutdown
Exit interface configuration mode
R1(config-if)# exit R1#
Interface Configuration Complete Example
R1> enable R1# configure terminal Enter configuration commands, one per line. End with CNTL/Z. R1# interface gigabitethernet 0/0/0 R1(config-if)# ip address 192.168.1.1 255.255.255.0 R1(config-if)# ipv6 address 2001:db8:cafe:1::1/64 R1(config-if)# ipv6 address fe80::1 link-local R1(config-if)# description Link to LAN R1(config-if)# no shutdown R1(config-if)# exit R1#