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Nokia Network Voyager for IPSO 4.0 Reference Guide 117
Loopback Interfaces
By default, the loopback interface has 127.0.0.1 configured as its IP address. Locally originated
packets sent to this interface are sent back to the originating process.
You might want to assign an address to the loopback interface that is the same as the OSPF
firewall ID, or is the termination point of a BGP session. This allows firewall adjacencies to stay
up even if the outbound interface is down. Do not specify an IP subnet mask length when you
add addresses to the loopback interface.
To add an IP Address to a Loopback Interface
You might want to assign an address to the loopback interface that is the same as the OSPF
router ID, or is the termination point of a BGP session. This allows firewall adjacencies to stay
up even if the outbound interface is down.
Note
The loopback interface always has a logical interface created and enabled.
1. Click Interfaces under Configuration > Interface Configuration in the tree view.
2. Click the loopback logical interface link in the Logical column (loop0c0).
3. To add an IP address, enter the IP address for the device in the New IP address text box.
Click Apply.
Each time you click Apply, the configured IP address appears in the table. The entry fields
remain blank to allow you to add more IP addresses.
4. Click Save to make your changes permanent.
To change the IP Address of a loopback interface
1. Click Interfaces under Configuration > Interface Configuration in the tree view.
2. Click the loopback logical interface link in the Logical column (loop0c0).
3. To remove the old IP address, click the Delete check box that corresponds to the address to
delete.
Click Apply.
4. To add the new IP address, enter the IP address for the device in the New IP address text
box.
Click Apply.
Each time you click Apply, the configured IP address appears in the table. The entry fields
remain blank to allow you to add more IP addresses.
5. Click Save to make your changes permanent.