On Sat, Jan 22, 2005 at 12:01:10AM +0100, Ingo wrote: > 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.
I'm not sure what your point is. It's certaintly the case that they are only useful if you trust all hosts on the ethernet. -- Brooks -- Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4
pgpTbU6Qtb4Kc.pgp
Description: PGP signature
