nanog mailing list archives
Re: [NANOG] OSPF minutia, and, technote publication venues
From: "Chris Grundemann" <cgrundemann () gmail com>
Date: Mon, 5 May 2008 11:18:56 -0600
On Mon, May 5, 2008 at 10:07 AM, Paul Vixie <vixie () isc org> wrote:
scg () gibbard org (Steve Gibbard) writes: > > ... if each anycast cluster is really several servers, each using OSPF > > ECMP, then you can lose a server and still have that cluster advertising > > the route upstream, and only when you lose all servers in a cluster will > > that route be withdrawn. > > This is getting into minutia, but using multipath BGP will also accomplish > this without having to get the route from OSPF to BGP. This simplifies > things a bit, and makes it safer to have the servers and routers under > independent control. i think the minutia is good, especially after a long weekend of layer 9 threads. my limited understanding of multipath bgp is that it's a global config knob for routers, not a per peer knob, and that it has disasterous consequences if the router is also carrying a full table and has many peers.
I am not sure what routers specifically are being discussed here, but in JunOS you can enable multipath on a global, group or single neighbor level, possibly eliminating your concern...
also, in OSPF, ECMP is not optional, even though most BSD-based software routers don't implement it yet (since multipath routing is very new.) so, we have been using OSPF for this, it just works out better. i dearly do wish that something like a "service advertisement protocol" existed, that did what OSPF ECMP did, without a router operator effectively giving every customer the ability to inject other customer routes, or default routes. in that sense, i agree with your "safer... independent control" assertion. > But yes, Joe's ISC TechNote is an excellent document, and was a big help > in figuring out how to set this up a few years ago. and now for something completely different -- where in the interpipes could a document like that have been published, vs. ISC's web site? the amount of red tape and delay involved in Usenix or IETF or IEEE or ACM are vastly more than most smart ops people are willing to put in. where is the light / middle weight class, or is every organization or person who wants to publish this kind of thing going to continue to have the exclusive and bad choice of "blog it, or write an article for ;login:/ACM-Queue/Circle-ID, or write an academic paper and wait ten months"? isn't this a job for... NANOG? -- Paul Vixie _______________________________________________ NANOG mailing list NANOG () nanog org http://mailman.nanog.org/mailman/listinfo/nanog
-- Chris Grundemann www.linkedin.com/in/cgrundemann _______________________________________________ NANOG mailing list NANOG () nanog org http://mailman.nanog.org/mailman/listinfo/nanog
Current thread:
- Re: [NANOG] Did Youtube not pay their domain bill?, (continued)
- Re: [NANOG] Did Youtube not pay their domain bill? Mike Lewinski (May 03)
- Re: [NANOG] Did Youtube not pay their domain bill? Kevin Blackham (May 03)
- Re: [NANOG] Did Youtube not pay their domain bill? Steve Gibbard (May 03)
- Re: [NANOG] Did Youtube not pay their domain bill? Paul Vixie (May 04)
- Re: [NANOG] Did Youtube not pay their domain bill? Deepak Jain (May 04)
- Re: [NANOG] Did Youtube not pay their domain bill? Steve Gibbard (May 05)
- [NANOG] OSPF minutia, and, technote publication venues Paul Vixie (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Mr. James W. Laferriere (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues David Andersen (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Marshall Eubanks (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Chris Grundemann (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Steven M. Bellovin (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Roland Dobbins (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Steven M. Bellovin (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Paul Vixie (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Roland Dobbins (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Paul Vixie (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Stuart Henderson (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Nathan Ward (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Joe Abley (May 05)
- Re: [NANOG] OSPF minutia, and, technote publication venues Nathan Ward (May 05)