Category Archives: Presentations

An Overview of BGP FlowSpec

I have given this presentation a few times in the last year and was asked to make this available for public consumption. Essentially, this is a brief overview of RFC 5575, entitled “Dissemination of Flow Specification Rules”, written by Danny McPherson, Jared Mauch, and others. This standard had somewhat of a rocky beginning as there was limited vendor support, but as of recently it appears to have picked up quite a bit of steam with Cisco announcing support for the protocol in the very near future. The benefit of BGP Flow Spec is that it allows BGP speakers to use a new BGP NLRI defining flow filter information which can then be advertised to upsteam neighbors via BGP. The primary and immediate motivation of this protocol is to provide intra and inter provider distribution of traffic filtering rules to filter DoS and DDoS attacks, however it can be used for a wide variety of applications in which filtering information must be dynamically distributed throughout a network. I will probably make additional modifications to these slides as the protocol gains more significant foothold throughout the vendor community and as Service Providers gain more practical deployment experience. As with my other presentations, I will eventually add a voice-over to turn this into a slide-cast.

IP Routing Tutorial

I’ve given this tutorial quite a few times now and several people have asked me to make it publicly available. This is very much geared towards non-technical folks who would like to have a better understanding of how routing in the Internet works. It covers a brief history of the Internet and evolution of dynamic routing protocols, as well as high-level coverage of link-state vs. distance vector IGPs in addition to discussing EGPs and their role in the exchange of routing information between Autonomous Systems. It also has a few slides on QoS, MPLS, and IPv6. I would still like to make some modifications to a few of the slides as well as adding more content around MPLS and the future of IP.  I will also eventually add a voice-over to turn this into a true slide-cast.  In the meantime, I’ve put it up on my slideshare account for those of you who would like to have access to it.