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Thread Index [isp-bgp] Re: BGP for the Tier-1 providers
Yes they do, 701 as a case in point use prefix lists to prevent people from advertising blocks they haven't organised to have advertised. Best regards David Taylor Network Architect Routed Solutions Ph : +612 8920 9652 Mo : +614 1407 2098 Email : davetayl@....au WWW : www.routedsolutions.com.au -----Original Message----- From: Jeff Barrows [mailto:jsb@...Sent: Saturday, 26 April 2003 02:39 To: isp-bgp@isp-bgp.com Subject: [isp-bgp] Re: BGP for the Tier-1 providers > All big ISP has AS path filtering based on internet registries. They > generate filters automatically one or two times in each day. Look at > http://www.irr.net/ for example. This is incorrect. Most networks [this thread was about networks such as AS 3561, 701, 1, and 1239] of that sort employ some sort of filtering towards peers that are also 'like them' in size or scope-- but some don't do any filtering of inbound announcements other than for bogons. These policies, and the processes that get the actual filters changed, are quite different from network to network. These policies and processes for 'peer' connections are also typically quite different than the policies and processes used for customer connections. Search the NANOG archives for RADB or IRR for more details and a variety of opinions as to their usefulness. You will also find a good bit of information relating to how the major networks employ various types of filtering across their 'peer' and customer BGP sessions. - jsb -- Jeff Barrows, President Firefly Networks http://FireflyNetworks.net +1 703 287 4221 Voice +1 703 288 4003 Facsimile An Advanced Internet Engineering & Professional Services Organization ------------------------ANNOUNCEMENT--------------------------------- --------------------------------------------------------------------- >> ISP Technology << VPN, DNS Security Management, spam, 3G, WLAN Security, P2P, VoIP, PLC, 802.11i, 802.1x and much more! http://www.wispcon.com/spring2003/attend-sessionlist.asp The 10th Annual ISPcon, Baltimore Waterfront Marriott April 23-25 ---------------------------------------------------------------------- ---------------------------------------------------------------------- ------------------------ANNOUNCEMENT--------------------------------- --------------------------------------------------------------------- >> ISP Technology << VPN, DNS Security Management, spam, 3G, WLAN Security, P2P, VoIP, PLC, 802.11i, 802.1x and much more! http://www.wispcon.com/spring2003/attend-sessionlist.asp The 10th Annual ISPcon, Baltimore Waterfront Marriott April 23-25 ---------------------------------------------------------------------- ----------------------------------------------------------------------
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