At 04:44 PM 6/26/2003 +0000, Priscilla Oppenheimer wrote: > > In fact I seem to remember that you *had* to specify it on a > subinterface level > > for a while, and it was in fact the encapsulation type that selected the > > subinterface. The reason for this behavior is that "Ethernet" has two > > sub-layers within Layer 2, so even there you have an implied encapsulation > > assigned to the physical interface (the lower of the two > sub-layers, the IEEE > > 802.3/Ethernet II format), and only the higher layer (layer 802.2) > > encapsulation is assigned to a subinterface. > >You can't tell an Ethernet interface to use 802.2 except within the IPX >network commands. Maybe you're thinking of the 802.1Q VLAN tagging standard.
No, I am thinking about the IPX case. Using multiple different encapsulations on a single physical interface used to be a typical question in the CCIE lab, that's why I remember it. I've never had to use it ever since, so I might have said something incorrectly, but I don't see what that was. I quickly looked at this page: http://www.cisco.com/univercd/cc/td/doc/product/software/ios111/mods/4mod/4cbook/4cipx.htm and I think it confirmed what I said (search for "subinterface" within the page), but I wouldn't mind to be corrected. >Ethernet encapsulation behavior isn't much like encapsulation on serial >interfaces, which can only be one of the major categories: HDLC, PPP, Frame >Relay. But Frame Relay has 2 varieties. I think I am missing the point here. Obviously they aren't the same, otherwise it would be foolish to give them such different names :), but I do think that the Ethernet encapsulations play a very similar role to the serial encapsulations (only in a different situation). If you mean that the original question was very Frame Relay and Cisco IOS implementation specific, and compared to that my answer was too generic and theoretical, then you are probably right. :) Thanks, Zsombor Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=71477&t=71421 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
