Both ISIS and OSPF are widely deployed in SP networks. Going to one or another depends on a lot of factors, one of them being or familiar your staff is with the protocol.
My preference would be ISIS as I believe it is more scalable. Also ISIS has always been the first IGP to support the new features such as MPLS TE, ipv6, etc because of the fact that it is more easily extendable.
Hope this helps,
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) email@example.com México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
as a bonus, a draft for RAPID routing and U-Turn routing is put on for RFC/standard. If implemented and with all finger crossed, the feature can reroute within 50ms (of course you need MPLS and LDP for this). This draft is for OSPF and ISIS.
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