Barry, Stephen wrote:
Please can someone explain to me the reasoning behind setting up a Loopback interface and using that as the source for flow exports. I forgot to do this on my original setup and everything seems to be working OK - will this cause me problems in the future? Does it matter what IP I use for the Loopback address - does this have any bearing on anything?
Do you have redundant paths from your router to your flow collector? If so, the export packets will have a source address of the "closest" interface to your collector at any given moment. If you lose a link and now prefer to reach your collector through a different router interface, your collector now thinks a new router is contacting it.
Even if you don't have redundant paths now, you'll probably want to add them later, and loopbacks are a Smart Choice(tm) for many other router tasks.
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