We are migrating from SharePoint 2010 to 2013. currently we have about 35 site collections where each site collection has its own database. So, we will be upgrading site collection by site collection by using database de-attach/attach method.
Now, here is the problem. We want to keep the same URL which is possible in case of doing the enitire upgrade in one go but we will be doing it in several phases. For this, we need to have both farms available simultaniously.
Can anybody suggest me a way to keep the same URL or may be a re-direct at site collection level as I need to migrate 35 site collection and once all are done then I can update the DNS to target SharePoint 2013 farm. This setting is required only for the transition phase which may take 4-6 months.
Any help is appreciated