I was teaching some basic BGP to some people today, sourcing off a loopback, ebgp-multihop 2, yada yada, when one of them asked "well why don't we just always set it to 255 to avoid wrong hop counts?". I wasn't able to answer that question. Researching it, I found someone that said you shouldn't do that, but he didn't even explain why. Most other articles just explained the basics of the command. So, why do you all think we shouldn't set it to 255? It's good enough for an IPv4 packet, so why not for BGP?
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