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[RouterA-GigabitEthernet2/0/1] ip address 10.1.1.1 255.255.255.0
[RouterA-GigabitEthernet2/0/1] quit
# Specify an IPv4 address for Serial 2/1/0, which is the physical interface of the tunnel.
[RouterA] interface serial 2/1/0
[RouterA-Serial2/1/0] ip address 2.1.1.1 255.255.255.0
[RouterA-Serial2/1/0] quit
# Create the IPv4 over IPv4 tunnel interface Tunnel 1.
[RouterA] interface tunnel 1 mode ipv4-ipv4
# Specify an IPv4 address for the tunnel interface.
[RouterA-Tunnel1] ip address 10.1.2.1 255.255.255.0
# Specify the IP address of Serial 2/1/0 as the source address for the tunnel interface.
[RouterA-Tunnel1] source 2.1.1.1
# Specify the IP address of Serial 2/1/1 on Router B as the destination address for the tunnel
interface.
[RouterA-Tunnel1] destination 3.1.1.1
[RouterA-Tunnel1] quit
# Configure a static route destined for IPv4 group 2 through the tunnel interface.
[RouterA] ip route-static 10.1.3.0 255.255.255.0 tunnel 1
• Configure Router B:
# Specify an IPv4 address for GigabitEthernet 2/0/1.
<RouterB> system-view
[RouterB] interface gigabitethernet 2/0/1
[RouterB-GigabitEthernet2/0/1] ip address 10.1.3.1 255.255.255.0
[RouterB-GigabitEthernet2/0/1] quit
# Specify an IPv4 address for Serial 2/1/1, which is the physical interface of the tunnel.
[RouterB] interface serial 2/1/1
[RouterB-Serial2/1/1] ip address 3.1.1.1 255.255.255.0
[RouterB-Serial2/1/1] quit
# Create the IPv4 over IPv4 tunnel interface Tunnel 2.
[RouterB] interface tunnel 2 mode ipv4-ipv4
# Specify an IPv4 address for the tunnel interface.
[RouterB-Tunnel2] ip address 10.1.2.2 255.255.255.0
# Specify the IP address of Serial 2/1/1 as the source address for the tunnel interface.
[RouterB-Tunnel2] source 3.1.1.1
# Specify the IP address of Serial 2/1/0 on Router A as a destination address for the tunnel
interface.
[RouterB-Tunnel2] destination 2.1.1.1
[RouterB-Tunnel2] quit
# Configure a static route destined for IPv4 group 1 through the tunnel interface.
[RouterB] ip route-static 10.1.1.0 255.255.255.0 tunnel 2
Verifying the configuration
# Use the display interface tunnel command to display the status of the tunnel interfaces on Router
A and Router B. Verify that the tunnel interfaces are up. (Details not shown.)
# Verify that Router A and Router B can ping the IPv4 address of the peer interface GigabitEthernet
2/0/1. This example uses Router A.
[RouterA] ping -a 10.1.1.1 10.1.3.1
Ping 10.1.3.1 (10.1.3.1) from 10.1.1.1: 56 data bytes, press CTRL_C to break