Create 2 or More Link from Ethernet

Few days ago I ever show about create 2 or more link from 1 physical link use frame-relay encapsulation Serial interface. Now I show about create more link use Ethernet interface, you can use Ethernet, FastEthernet, GigabitEthernet or xxxEthernet.

Ethernet interface as layer 2 or layer 3 can create logical link. Ethernet interface layer 3 use subinterface as logical link. Here example the configuration :

Router R with step configure

R#sh run int f0/0  
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
end

R(config)#int f0/0.1
R(config-subif)#ip address 10.10.10.1 255.255.255.252

% Configuring IP routing on a LAN subinterface is only allowed if that 
subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q, 
or ISL vLAN.

R(config-subif)#encapsulation ?
  dot1Q  IEEE 802.1Q Virtual LAN
  isl    Inter Switch Link - Virtual LAN encapsulation

R(config-subif)#encapsulation dot1Q ?
  <1-4094>  IEEE 802.1Q VLAN ID

R(config-subif)#encapsulation dot1Q 10
R(config-subif)#ip address 10.10.10.1 255.255.255.252

R#sh run int f0/0.1
interface FastEthernet0/0.1
 encapsulation dot1Q 10
 ip address 10.10.10.1 255.255.255.252
 no snmp trap link-status
end

R#sh run int f0/0.2
interface FastEthernet0/0.2
 encapsulation dot1Q 20
 ip address 10.10.20.1 255.255.255.252
 no snmp trap link-status
end

Router R2 and verify

R2#sh run int f0/0
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
end

R2#sh run int f0/0.1
interface FastEthernet0/0.1
 encapsulation dot1Q 10
 ip address 10.10.10.2 255.255.255.252
end

R2#sh run int f0/0.20
interface FastEthernet0/0.20
 encapsulation dot1Q 20
 ip address 10.10.20.2 255.255.255.252
end

R2#ping 10.10.10.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/28/44 ms

R2#ping 10.10.20.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.20.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/36/52 ms