I read a recent study that showed that ISIS is the IGP used by the majority of the world's tier-1 ISP's.
""MADMAN"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > If ISIS is used anywhere besides the lab it's by larger ISPs. > > Dave > > "Ladrach, Daniel E." wrote: > > > > On our backbone we use Juniper routers. Also, we do not run OSPF either. > > > > Daniel Ladrach > > CCNA, CCNP > > WorldCom > > > > -----Original Message----- > > From: Jeffrey Reed [mailto:[EMAIL PROTECTED]] > > Sent: Monday, March 18, 2002 7:22 AM > > To: [EMAIL PROTECTED] > > Subject: RE: IGP's in ISP [7:38614] > > > > Is it a good assumption that most ISP's, big & small run Cisco routers in > > their core networks? If so, why don't they use EIGRP? I've run into so many > > Cisco routers guys in corporations who threaten holy wars when you ask them > > to move to standards-based OSPF. They claim EIGRP runs more efficiently on > a > > Cisco router than OSPF... less memory, less CPU etc. If this is correct, > why > > don't ISPs run that as their interior routing protocol? > > > > Jeffrey Reed > > Classic Networking, Inc. > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > Peter > > van Oene > > Sent: Sunday, March 17, 2002 8:35 PM > > To: [EMAIL PROTECTED] > > Subject: Re: IGP's in ISP [7:38614] > > > > ISP's typically run one of IS-IS, or OSPF as their IGP's and manage only > > link and loopback address space within it. IBGP is always fully meshed, > > although most use tools like Route Reflection and Confederations to avoid > > the n*(n-1)/2 scaling issues IBGP can present. Synchronization is an > > antiquated feature that hasn't been turned on in production ISP's for > > years. Most new routing implementations do not even include the > > functionality in their BGP code. > > > > An overall design theory is to keep the IGP as small and efficient as > > possible to as to maximize convergence, and to keep everything else in BGP > > where rich tools like community based policy can be leveraged fully. > > > > pete > > > > At 05:52 PM 3/17/2002 -0500, Steven A. Ridder wrote: > > >Hey guys and gals, > > > > > >I have never worked in an ISP, so I have no idea how they run. I'm just > > >curious, do they run an IGP in addition to IBGP and is it fully > > >synchronized? I'm just curious to see how it's done in the real world. > > > > > >-- > > > > > >RFC 1149 Compliant. > > >Get in my head: > > >http://sar.dynu.com > -- > 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=38707&t=38614 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
