I'm working with some sites that have a custom CMS. When you enter a new URL for a 301 redirect, apparently a session ID is created, and I started noticing a lot of these IDs in Google Analytics coming up as landing pages for the sites. Is it worth it to just leave the crappy URLs well enough alone and focus on other on-site elements, or should I implement the canonical link element and hope that it works? Right now there's no way to not create the session IDs upon redirecting pages.