IP Link-State Routing Protocols - CCIE Routing and Switching Exam Certification Guide - page 393

A loopback interface is configured, so the router uses the loopback interface IP address as its
RID. The loopback interface is in area 0.

Interface Serial 0.1 is a Frame Relay link in area 10. MD5 is enabled on this interface.

Summarizing OSPF Routes
The internetwork from Figure 8-6 in the previous examples is modified by adding a new interface
to Router 10, which has another router and several new IP subnets connected to it, as shown in
Figure 8-7. Tokenring0 is enabled on Router 10 and is part of area 20. The new subnetwork is
192.16.100.64/29.

OSPF Network Shown in Figure 8-6 with the Addition of a New Network on Router 10 Figure 8-7

Router 10
tokenring0: 192.16.100.65/29

Static 10.0.0.0/24

Area 20
transit area

Router 9
loop0: 192.16.100.2/32
e0: 192.16.100.18/28
s0: 192.16.100.241/30

Area 30

Router 9

Router 10

s0

s0

e0

e0

Area 0

Virtual Link

Router 10
loop0: 192.16.100.3/32
e0: 192.16.100.33/28
s0: 192.16.100.242/30

e0

Router 3
loop0: 192.16.100.4/32
e0: 192.16.100.19/28
s0.1: 192.16.100.245/30

Router 3

s0.1

Area 10
authentication
enabled

Frame
Relay

s0.1

Router 7

e0

Router 7
loop0: 192.16.100.5/32
e0: 192.16.100.129/27
s0.1: 192.16.100.246/30