Friday, February 24, 2006


Loopback and OSPF Router LSAs. (Question #23)

Assume that on a router with router-id a loopback interface is configured with the IP address In the area in which this router is connected, the OSPF database shows the following regarding this loopback interface -

R1#sh ip ospf database router
Link connected to: a Stub Network
(Link ID) Network/subnet number:
(Link Data) Network Mask:
Number of TOS metrics: 0
TOS 0 Metrics: 1

What can you deduce about the loopback interface configuration from the above output?

You probably have this configured under interface loopback:
ip ospf network point-to-point

otherwise you will see the
(Link Data) Network Mask:

even if you have the ip address of
You are right; the loopback interface is configured as a point-to-point interface.
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