On Fri, Oct 23, 2015 at 1:41 AM, marcel.duregards@yahoo.fr <marcel.duregards@yahoo.fr> wrote:
sorry for that, but the only one I've heard about switching his core IGP is Yahoo. I've no precision, and it's really interest me. I know that there had OSPF in the DC area, and ISIS in the core, and decide to switch the core from ISIS to OSPF.
Wait, what? *checks memory* *checks routers* Nope. Definitely went the other way; OSPF -> IS-IS in the core.
Why spend so much time/risk to switch from ISIS to OSPF, _in the core_ a not so minor impact/task ? So I could guess it's for maintain only one IGP and have standardized config. But why OSPF against ISIS ? What could be the drivers? People skills (more people know OSPF than ISIS) --> operational reason ?
I'm sorry you received the wrong information, the migration was from OSPF to IS-IS, not the other way around. Thanks! Matt