Vyatta Network OS Documentation

Learn how to install, configure and operate the Vyatta NOS, which helps drive our virtual networking & physical platforms portfolio.

Basic IP unnumbered interface configuration

Configuring IP unnumbered interfaces presents a sample configuration of two routers with unnumbered interfaces and a static route.

Figure 1. Configuring IP unnumbered interfaces

To configure these interfaces, perform the following steps in configuration mode.

Table 1. Configuring IP unnumbered interfaces on VR1

Step

Command

Create a loopback interface, and configure the IP address.

vyatta@Router# set interfaces loopback lo1 address 133.0.0.1/32

Create the configuration node for the vif; assign the vif VLAN ID 60; and then assign the IP address for the vif.

vyatta@Router# set interfaces dataplane dp0s192 vif 60 vlan '60'

Borrow the IP address from a loopback interface.

vyatta@Router# set interfaces dataplane dp0s192 vif 60 ip unnumbered donor‐interface lo1

Add a static-interface route to reach the other network.

vyatta@Router# set protocols static interface‐route 132.0.0.1/32 next‐hop‐interface 'dp0s192.60'

Add a route to the destination network.

vyatta@Router# set protocol static route 192.168.2.0/0 nexthop 132.0.0.1

Commit the configuration.

vyatta@Router# commit

Verify whether the IP unnumbered support has been configured correctly.

vyatta@Router# show interfaces dataplane dp0s192 vif 60
ip {
        unnumbered {
                donor-interface lo1
        }
}
vlan 60

Table 2. Configuring IP unnumbered interfaces on VR2

Step

Command

Create a loopback interface, and configure the IP address.

vyatta@Router# set interfaces loopback lo1 address 132.0.0.1/32

Create the configuration node for the vif; assign the vif VLAN ID 60; and then assign the IP address for the vif.

vyatta@Router# set interfaces dataplane dp0s192 vif 60 vlan '60'

Borrow the IP address from a loopback interface.

vyatta@Router# set interfaces dataplane dp0s192 vif 60 ip unnumbered donor‐interface lo1

Add the static interface route to reach the other network.

vyatta@Router# set protocols static interface‐route 133.0.0.1/32 next‐hop‐interface 'dp0s192.60'

Add a route to the destination network.

vyatta@Router# set protocol static route 192.168.1.0/0 nexthop 133.0.0.1

Commit the configuration.

vyatta@Router# commit

Verify whether the IP unnumbered support has been configured correctly.

vyatta@Router# show interfaces dataplane dp0s192 vif 60
ip {
        unnumbered {
                donor-interface lo1
        }
}
vlan 60