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show/view/watch/display/differ is pretty unique to freeRouter, and is really meant to provide you the best user experience as a network operator ! these These command have proven to be helpful, especially if you deal with huge feed. However, be careful when you are working with very big output such BGP full feed. This won't crash the router of course as we used to when we issued "debug ip packet" but it will for sure imply a high CPU usage due to regular refresh at the control plane level.
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