I have yet to have an ISP refuse to announce a customers /24 network so I don't think it's that common.
Dave Eric wrote: > > IMHO - You will need at least a /21 as some ISP's set policies that will > filter anything less. > > Best bet is to pick up a copy of: Internet Routing Architectures, Second > Edition. ISBN# 1-57870-233-X. > > This book will also introduce you to the third item to consider when > connecting to two ISP's: Symmetry. > > Regards, > Eric > > ----- Original Message ----- > From: "John Neiberger" > To: > Sent: Tuesday, January 15, 2002 7:37 PM > Subject: Re: BGP AS Number [7:32107] > > > To make connections to separate ISPs work, you need to have > > some address space assigned to you that is large enough to be > > routed successfully. This generally means that you have to > > have at least a /24 prefix. > > > > Once you've successfully gotten that address space from one of > > your providers you can apply at www.arin.net to get an ASN. > > > > If you were only considering multiple connections to the same > > ISP one option would be to use a private ASN, or you might not > > need to use BGP at all. > > > > However, to do what you're considering, you need to have your > > own ASN and address space. > > > > Also, for the nitpickers I'm being overly general on > > purpose. This can get to be much more complicated if you want > > it to be. :-) > > > > HTH, > > John > > > > > > ________________________________________________ > > Get your own "800" number > > Voicemail, fax, email, and a lot more > > http://www.ureach.com/reg/tag > > > > > > ---- On Tue, 15 Jan 2002, Shawn Xu ([EMAIL PROTECTED]) > > wrote: > > > > > As far as we know, when you connect to two ISPs for load > > balancing and > > > fault > > > tolerance, you have to configure BGP, please refer > > > > > > http://www.cisco.com/warp/public/459/40.html > > > > > > but from the above examples, you have to have your own AS > > number. If I > > > don't > > > have my own AS number, I can not connect to two ISPs? > > > > > > Please help, thanks. > > > > > > Shawn Xu > > > > > > > > ________________________________________________________________ > > _ > > > MSN Photos is the easiest way to share and print your photos: > > > http://photos.msn.com/support/worldwide.aspx > > [EMAIL PROTECTED] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 "Emotion should reflect reason not guide it" Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=32168&t=32107 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
