> > I feel your pain Bill, but from a slightly different angle. For years the > large CDNs have been disregarding prepends. When a source AS disregards > BGP best path selection rules, it sets off a chain reaction of silliness > not attributable to the transit AS's. At the terminus of that chain are > destination / eyeball AS's now compelled to do undesirable things out of > necessity such as: > 1) Advertise specifics towards select peers - i.e. inconsistent edge > routing policy & littering global table > 2) Continuing to prepending a ridiculous amount anyway > Gotta wonder how things would be if everyone just abided by the rules. >
What 'rule' are you asserting is being broken here? On Mon, Jan 22, 2024 at 9:56 PM Jeff Behrns via NANOG <nanog@nanog.org> wrote: > > > William Herrin <b...@herrin.us> wrote: > Until they tamper with it using localpref, BGP's default behavior with > prepends does exactly the right thing, at least in my situation. > > I feel your pain Bill, but from a slightly different angle. For years the > large CDNs have been disregarding prepends. When a source AS disregards > BGP best path selection rules, it sets off a chain reaction of silliness > not attributable to the transit AS's. At the terminus of that chain are > destination / eyeball AS's now compelled to do undesirable things out of > necessity such as: > 1) Advertise specifics towards select peers - i.e. inconsistent edge > routing policy & littering global table > 2) Continuing to prepending a ridiculous amount anyway > Gotta wonder how things would be if everyone just abided by the rules. > >
