Here's the official explanation -
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We noticed our connection go down on one of our two main distribution switches. The connection to our 6509 routing switch was online the whole time, but since we didn't have a link between that and one of the distribution switches about half our network segment was in a routing loop. The 6500 wanted to route to something, but didn't have a link to route to. About 15 minutes later, the connection came back to normal. It may be a gbic that needs to be replaced. We're keeping a close eye on it.
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