226 Chapter 7: OSPF, EIGRP, and IGRP
Simple password authentication exchanges clear-text passwords across the network and can be
detected with a network sniffer.
NOTE
Always use MD5 authentication. MD5 authentication uses cryptography and does not exchange
password information across the network.
Figure 7-6 shows an example of OSPF Clear-Text and Message Digest Authentication.
Figure 7-6
OSPF Authentication
Creating Neighbors
Two OSPF routers do not become neighbors unless they share the following:
·
Area-id--Routers that share a common segment must belong to the same area on that
segment.
Backbone area 0
Area border router
Area 1
Default link 0.0.0.0
87200333.book Page 226 Wednesday, August 22, 2001 2:37 PM