I have a main router with several other switches connected to it. The network went down and when I consoled the main router, it was sluggish. Rebooted it, but once the interfaces where the other switches were connected came up, the router went back to being sluggish. Bounced the switches one by one and everything was back to normal. Now I need to figure out which of the switches was the source of the issue, and what the issue was.
What logs should I be looking at? What might I be looking for?