User manual

Nortel Secure Router 8000 Series
Configuration -WAN Access 5 Logical interface configuration
Issue 5.3 (
30 March 2009) Nortel Networks Inc. 5-19
5.7.3 Example for configuring the loopback interface
Networking requirements
After you configure the loopback interface with IP address, it works as the lending party in
the IP unnumbered. Loopback interface uses 30-bit mask.
Figure 5-2 Networking diagram of configuring the loopback interface
RouterA RouterB
POS3/0/0
POS3/0/0
10.10.1.1/32
Configuration roadmap
The configuration roadmap is as follows:
1. Create the loopback interface and configure the IP address.
2. Configure the POS interface to borrow the IP address of the loopback interface.
Data preparation
To configure the loopback interface, you need the following data.
z
The loopback interface number is 6.
z
The IP address of the loopback interface is 10.10.1.1/30.
z
The interface that borrows the IP address is POS 3/0/0.
Configuration procedure
Step 1 Configure Router A.
# Create a loopback interface and allocate an IP address for it.
<Nortel> system-view
[Nortel] sysname RouterA
[RouterA] interface loopback 6
[RouterA-LoopBack6] ip address 10.10.1.1 30
[RouterA-LoopBack6] quit
# Configure POS 3/0/0 to borrow the IP address of the created loopback6.
[RouterA] interface pos 3/0/0
[RouterA-Pos3/0/0] ip address unnumbered interface loopback 6
[RouterA-Pos3/0/0] quit
Step 2 Configure Router B
<Nortel> system-view
[Nortel] sysname RouterB
[RouterB] interface pos 3/0/0
[RouterB-Pos3/0/0] ip address 10.10.1.2 30