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 <[email protected]> wrote: > 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 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 (due to mergers and acquisitions) and the two ASes happen to run ISIS > and OSPF respectively. In such instances, there is a brief period when two > protocols might run together before one gets turned off and there is only > one left. > > The other instance would be when say OSPF is used to manage the OOB network > and the ISIS is used for network reachability. > > Is there any other scenario? > > Glen
