Date: Sat, 22 Jan 2005 00:01:10 +0100 (CET) From: Ingo <chaoztc@confusion.at> To: <freebsd-net@freebsd.org> Subject: Re: [PATCH] 802.1p priority (fixed) Message-ID: <20050121235344.E93890-100000@ix.reflection.at> In-Reply-To: <20050121195050.GA2866@odin.ac.hmc.edu>
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Hi, > My concern is that 802.1p is like the TOS bits in that it differentiates > packets within a network rather then segregating them in to networks > like 802.1Q. In a switch it makes sense to handle priorities as separate > networks, but I'm not sure it makes sense in a host. If nothing else, > it seems to make sense to be able to set priorities on vlan encapsulated > frames. In an Isp backbone I trust 802.1Q packets because no customer has access to tagged vlan connections. Trusting in TOS bit is in such a network no good idea because every customer could send IP traffic. And overwriting the TOS bit at all network edges could be a pain to not miss some edges. 802.1Q is some kind of "out of band" QOS for IP. L2 Ethernet switches could also handle 802.1Q but not the TOS bits in the IP header. bye, Ingo
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