Well up until not too long ago, to support IPv6 you would run OSPFv3 and for IPv4 you would run OSPFv2, making IS-IS more attractive, but that is no longer the case with support for IPv4 NLRI in OSPFv3. The only reason in my opinion to run IS-IS rather than OSPF today is due to the fact that IS-IS is decoupled from IP making it less vulnerable to attacks. Stefan Fouant JNCIE-M, JNCIE-ER, JNCIE-SEC, JNCI Technical Trainer, Juniper Networks http://www.shortestpathfirst.net http://www.twitter.com/sfouant Sent from my iPad On Aug 11, 2011, at 8:57 AM, CJ <cjinfantino@gmail.com> wrote:
Hey all, Is there any reason to run IS-IS over OSPF in the SP core? Currently, we are running IS-IS but we are redesigning our core and now would be a good time to switch. I would like to switch to OSPF, mostly because of familiarity with OSPF over IS-IS. What does everyone think?
-- CJ
http://convergingontheedge.com <http://www.convergingontheedge.com>