OSPF supports two other authentication methods:
?– Plaintext (or simple) password authentication (Type 1)
?– MD5 authentication (Type 2)
OSPF MD5 authentication includes an increasing sequence number in each OSPF packet to
protect against replay attacks.
Example 4-9 Finding Equal-Cost Routes with the show ip route Command
RouterX#sshhooww iipp rroouuttee 119944..116688..2200..00
Routing entry for 194.168.20.0/24
Known via ???ospf 1", distance 110, metric 74, type intra area
Redistributing via ospf 1
Last update from 10.10.10.1 on Serial1, 00:00:01 ago
Routing Descriptor Blocks:
* 20.20.20.1, from 204.204.204.1, 00:00:01 ago, via Serial2
Route metric is 74, traffic share count is 1
30.30.30.1, from 204.204.204.1, 00:00:01 ago, via Serial3
Route metric is 74, traffic share count is 1
10.10.10.1, from 204.204.204.1, 00:00:01 ago, via Serial1
Route metric is 74, traffic share count is 1
Introducing OSPF 157
Con?¬?guring Plaintext Password Authentication
To con?¬?gure OSPF plaintext password authentication, complete the following steps:
Step 1 Use the interface level ip ospf authentication-key password command to
assign a password to use with neighboring routers that use the OSPF simple
password authentication.
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