North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: BGP Path Filtering
On Thu, 15 May 2003, Mark Radabaugh wrote: > I'm having a hard time finding best practices for filtering outbound bgp > announcements when providing transit to bgp-speaking customers. While we > currently multi-home to several providers it appears we will soon need to > provide transit for customers with their own AS's. I like using BGP communities: o filter announcements you receive from downstreams based on your criteria of choice o set a specific BGP community (yourAS:whatever) on announcements which are to be propagated to various places (upstream providers, etc.) o do output filtering based on the communities you set Make sure you clear yourAS:whatever in announcements from your BGP peers. You can use this same technique for prefixes you originate, so that all your outbound BGP filtering is based on communities. ________________________________________________________________________ Jay Ford, Network Engineering Group, Information Technology Services University of Iowa, Iowa City, IA 52242 email: [email protected], phone: 319-335-5555, fax: 319-335-2951
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