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Loopback tester how to#
Loopback tester serial#

Let’s ping the loopback IP address from both R1 and R2. We can now see that the OSPF neighborship is established. Let’s start by configuring the physical and loopback interfaces.

We’ll use the network topology below for the sample configuration.

Loopback tester how to#

I am going to show you how to configure the loopback interface and loopback address and use it as the Router ID for OSPF. It also allows us to test IP software without worrying about broken or corrupted drivers or hardware.It can also be used as a source and destination address for testing network connectivity and lab environments.Adding and troubleshooting other services like LDP for MPLS or building MPLS L2 cross-connects, loopback address becomes extremely important to easily identify the peer routers to deliver the services in large Service Provider environments. Loopback address becomes even more important in large fully meshed or route-reflector BGP environments where many routers will have multiple peering with many other BGP speakers.

Loopback tester serial#

The ‘ip unnumbered’ configuration command allows you to enable IP processing on a serial interface without assigning it an explicit IP address.

It is also recommended that the unnumbered interface points to a loopback interface since loopbacks do not fail.

TACACS+ or RADIUS can use the loopback address as a source address for AAA functions and thereby reducing the administration overhead of having to add every IP address of the router to the AAA server.

A loopback interface can also be used to establish a Telnet session from the console port of the device to its auxiliary port when all other interfaces are down.

You can also configure the loopback address as the Router ID for routing protocols like OSPF and BGP.

A good example is mapping a router’s loopback IP address to its DNS server address.

We would reap the following advantages and benefits of having loopback interfaces and loopback addresses in our network: Loopback addresses are not limited to the 127.0.0.0/8 block.