Friday, February 24, 2006

 

Loopback and OSPF Router LSAs. (Question #23)

Assume that on a router with router-id 1.1.1.1 a loopback interface is configured with the IP address 80.80.80.80/24. 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 1.1.1.1
 :
 :
   Link connected to: a Stub Network
    (Link ID) Network/subnet number: 80.80.80.0
    (Link Data) Network Mask: 255.255.255.0
     Number of TOS metrics: 0
      TOS 0 Metrics: 1
 :
 :

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

# posted by Cisco da Gama @ 3:15 PM
Comments:
You probably have this configured under interface loopback:
ip ospf network point-to-point

otherwise you will see the
(Link Data) Network Mask: 255.255.255.255

even if you have the ip address of 80.80.80.80/24
# posted by Anonymous Anonymous : Tue Mar 14, 03:40:00 PM 2006
 
You are right; the loopback interface is configured as a point-to-point interface.
# posted by Blogger Cisco da Gama : Tue Mar 14, 11:01:00 PM 2006
 
Great read thankss
# posted by Anonymous Insulation Contractors Greenville : Sat Nov 19, 03:04:00 AM 2022
 
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