In this section, we are going to be learning about the different types of authentication supported by OSPF. Unlike EIGRP, OSPF supports plain text and MD5 authentication. The authentication method used by OSPF is specified in the OSPF packet header in the 16-bit Auth Type field. This field may contain one of three codes. These three codes are:
- Code 0 – Used to indicate that there is Null or no authentication
- Code 1 – Used to indicate that the plain text authentication
- Code 2 – Used to indicate Message Digest 5 (MD5) authentication
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