RE: OSPF vs IS-IS vs PrivateAS eBGP

Configure eBGP from your edge to the client edge using private-AS. Since I already have copy/paste templates (thanks to RANCID), I make it a habit to ensure filters are at both ends. Goes without saying that BCP-38 is followed, and strict is deployed everywhere possible.

peer-group and regexes are handy.

If you're starting from scratch, use peer templates, they are slightly more versatile than the peer groups and allow (limited) inheritance. Ivan http://www.ioshints.info/about http://blog.ioshints.info/