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This updates (or adds) a compression context whenever a new prefix arrives at the border router. This allows 6LoWPAN to compress said prefix in the network. Sadly, there is now way to just remove the context when the prefix is overwritten, so I do not do it. If an administrator chooses to reset the prefix they can use `6ctx del` which timeouts the prefix appropriately, but IMHO it doesn't hurt to keep the old contexts.