Security inside AS

Hi,

I understand that in theory we need to protect our IGPs from all sorts
of attacks.

But do we really have service providers who enable authentication
(MD5, etc) inside their ASes for their IGPs (OSPF/IS-IS)?

Thanks,
Glen

Yes, i know of several providers who do this.

  - jared

Thanks to everyone for replying!

I am overwhelmed with the response that i received offline.

Thanks once again!

Cheers,
Glen