nanog mailing list archives
Re: OSPF -vs- ISIS
From: Eric Gauthier <eric () roxanne org>
Date: Wed, 22 Jun 2005 11:42:46 -0400
On Tue, Jun 21, 2005 at 03:16:06PM +0100, Richard Dumoulin wrote:
Hi Eric, what's the reason for migrating to ISIS?
There are currently a few projects that we're doing which prompted us to take a look at how we're doing routing, both IGP and EGP. We're altering our border connectivity by spreading our multiple commodity Internet and Internet2 peers across multiple routers that connect into our core at multiple locations. As a result, we're likely to bring iBGP into our core and, clearly, this is going to alter our IGP setup. We're also looking into MPLS layer 2 VPNs to solve certain traffic classification issues (e.g. limiting I2 access, allowing "guest wireless" etc), which also means that we'd likely need to make modifications to our IGP/EGP setup. Though we filter OSPF multicast traffic, we wanted to add in MD5 passwords to our neighbors. We're deploying IPv6 within our campus, so we needed to look for an IGP to support this. Since we're going to have to make changes, some significant, to our IGP setup (currently multi-area OSPF) no matter what, we felt it made sense to review our options. It looks like IS-IS and OSPF are pretty much the same in terms of functionality. IS-IS, though, looks like it handles IPv6 networks more efficiently, its area scheme seems to match a little more to our topology, and the "security' element (i.e. you can't inject packets) of the adjacencies seems interesting. Also, as I said, we're likely going to move to an iBGP-based core, which seems to run parrallel to what service providers are doing, so I have to admit that "follow the leader" also played into the decision as larger ISP seem to be doing the iBGP/IS-IS combo. Eric :)
Current thread:
- RE: OSPF -vs- ISIS, (continued)
- RE: OSPF -vs- ISIS Manav Bhatia (Jun 22)
- Re: OSPF -vs- ISIS Abhishek Verma (Jun 27)
- Re: OSPF -vs- ISIS Fergie (Paul Ferguson) (Jun 21)
- RE: OSPF -vs- ISIS Mike Bernico (Jun 21)
- Re: OSPF -vs- ISIS Stephen Sprunk (Jun 21)
- Re: OSPF -vs- ISIS Wayne E. Bouchard (Jun 21)
- Re: OSPF -vs- ISIS Robert E . Seastrom (Jun 21)
- Re: OSPF -vs- ISIS Stephen Sprunk (Jun 21)
- RE: OSPF -vs- ISIS Manav Bhatia (Jun 22)
- Re: OSPF -vs- ISIS Fergie (Paul Ferguson) (Jun 21)
- RE: OSPF -vs- ISIS Barry Greene (bgreene) (Jun 22)
- Looking for feedback on Huawei Ethernet over Sonet gear fkittred (Jun 22)
- Re: OSPF -vs- ISIS Eric Gauthier (Jun 22)
- Re: OSPF -vs- ISIS Dan Evans (Jun 23)