North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Verio Decides what parts of the internet to drop
On Thu, 2 Dec 1999, Jared Mauch wrote: > Your pager didn't go off when the routing table had 100k prefixes > in it, I take it. > > This is a Good Thing(tm). Au contriar, monfrair (sp?). I was among the first to call Vinnie. > > I believe that if I have a customer who is multihomed between me and > > another provider, his punch-throughs to the non-address-space-providing > > provider should be heard. It's called 'global routability.' > > The people who "purchased" this space, didn't realize that such > routing policies exist, and it is not the problem of someone trying to reach > them, it's the problem of the person who is using address space that > was not originally assigned to them. You misinterpreted. Multihomed customer gets a /24 of my announced /16. He's announcing that /24 to his other provider; since it is more specific the other provider will always win (BGP 101). So, for it to work, I need to allow a punch through of a /24 to my peers. And for it to _really_ work, people would have to listen to the /24 from both us and the other provider to our multihomed customer. > > There are ways to get around this (as-path filtering, maximum-paths, etc) > > that aren't as nazi as one would hope, but will prevent stupidity and > > provide sanity checking. > > Maximum paths deals primarily with ibgp Well, thats patently wrong. I don't know how else to respond to this. > as-path filtering? How will this help? It will prevent redistribution of a person who announces * to you. It won't fix everything (including the 7007 debacle, but thats a whole another story), but it will fix most fsck-ups. > Oh yeah, I'll as-path filter my peers, and then have even > more reacability issues. Tell Sprint, Agis, and others. Unless they changed since my last dealing with them. > > But unfortunate. Will they announce a customer-announced /24? > > Yes. > > They can't guarentee that peers will listen to it though. Well, it's a start. > Jared Mauch | pgp key available via finger from [email protected] > clue++; | http://puck.nether.net/~jared/ My statements are only mine. > END OF LINE |
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