ISIS and OSPF together

2013-05-12 Thread Glen Kent
Hi, I would like to understand the scenarios wherein the service provider/network admin might run both ISIS and OSPF together inside their network. Is this something that really happens out there? One scenario that i can think of when somebody might run the 2 protocols ISIS and OSPF together for

Re: ISIS and OSPF together

2013-05-12 Thread Peter Ehiwe
Ospf offered as Pe-ce protocol to L3 mpls vpn customers and Isis as IGP for MPLS Core. Sent from my iPhone On May 12, 2013, at 9:41 AM, Glen Kent glen.k...@gmail.com wrote: Hi, I would like to understand the scenarios wherein the service provider/network admin might run both ISIS and

Re: ISIS and OSPF together

2013-05-12 Thread Mikael Abrahamsson
On Sun, 12 May 2013, Glen Kent wrote: Is there any other scenario? When you might run OSPFv3 (for IPv6) and ISIS (IPv4) together because you have equipment that is buggy for ISIS multi topology. -- Mikael Abrahamssonemail: swm...@swm.pp.se

Re: ISIS and OSPF together

2013-05-12 Thread Randy Bush
One scenario that i can think of when somebody might run the 2 protocols ISIS and OSPF together for a brief period is when the admin is migrating from one IGP to the other. This, i understand never happens in steady state. The only time this can happen is if an AS gets merged into another AS

Re: ISIS and OSPF together

2013-05-12 Thread Victor Kuarsingh
Glen, One transition scenario you noted below is often a use case. I have seen networks move from OSPF to IS-IS (more cases then the reverse). In those cases, the overlap period may not be very short (years vs. weeks/months). I have also seen some use one protocol (which I think was mentioned

Re: ISIS and OSPF together

2013-05-12 Thread Måns Nilsson
Subject: ISIS and OSPF together Date: Sun, May 12, 2013 at 02:11:37PM +0530 Quoting Glen Kent (glen.k...@gmail.com): Hi, I would like to understand the scenarios wherein the service provider/network admin might run both ISIS and OSPF together inside their network. Is this something that

Re: ISIS and OSPF together

2013-05-12 Thread Glen Kent
Victor, Folks could, at least theoretically, use ISIS or OSPF multi instance/multi topology extensions to support IPv4 and IPv6 topologies. This way they would only need to run a single protocol and thereby requiring expertise in handling only one protocol. With whatever i remember, OSPFv3 can

Re: ISIS and OSPF together

2013-05-12 Thread Scott Morris

Re: ISIS and OSPF together

2013-05-12 Thread Victor Kuarsingh
Glen, Yes, if you are referring to RFC5838 like functionality in OSPFv3 (AF support) that is correct. I personally don't have experience with that mode of operation (as the networks I had experience with went dual stack a while back). I guess someone looking to dual stack now may want to