route authentication

I'm wondering just how many ISPs are using HMAC-MD5 to authenticate IS-IS route advertisements within their ASs, or MD5 on BGP peering sessions? I don't need a real number, just a sense of the community. Is usage increasing? is it dead? is it regional? etc. Any anecdotal info you have is appreciated. I don't need names of ISPs, just whether or not these technologies are being used. thanks, Barbara Barbara Fraser Consulting Engineer Cisco Systems, Inc. Phone: +1 (408) 525-1735