From: Joe Higgins (netsat@optonline.net)
Date: Thu Sep 19 2002 - 14:25:23 GMT-3
Frank,
The confusion is caused by the fact that there are two ways to do
authentication. The old way, by area, and the new way, by interface. The new
way which conforms to the latest RFC was implemented in IOS 12.0. You can
still use either method
Under the old way if area 0 was configured for authentication then the virtual
link
had to mirror that authentication type. Under the new way the virtual link
or any other interface does not have to track the area 0 authentication and can
be any type of authentication or no (null) authentication. Under the old way
only one authentication command was required on the interface. Under the new
way two authentication type commands are required on the interface. One of
these authentication commands lets the IOS know that you are using the new
authentication type.
any wrote:
> Group,
>
> I know this topic has been talked a lot, but just one thing is still not
> clear in my mind.
> Is there any relationship between virtual link authentication and
> backbone authentication or transit area authentication?
> For example, if ospf backbone has been asked to config as clear text
> authentication and transit area has been asked to config as MD5
> authentication, do I have to config virtual link authentication as clear
> text or MD5 or I don't even need to do authentication on virtual link?
> Thanks.
>
> Frank
>
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