Oops. The last one was a Null Post. I meant to hit the Quote button and hit the Post button instead.
I do have a few comments, though, of course. :-) See below. Priscilla Oppenheimer wrote: > > The Long and Winding Road wrote: > > > > ""Priscilla Oppenheimer"" wrote in > > message > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > The router is probably in the same rack as the switch. The > > cable is > > probaby > > > very short. The fact that electrons have to travel across it > > is not a > > > consideration. They travel at about 2/3 the speed of light. > > > > I was being half facetious while referring to the fact that > > router on a > > stick has to do things with the L2 headers as it forwards, > > while an > > intergrated L3 switch does not. Along with the CPU interrupt > > times and > > issues. You mentioned two things, to quote your message: "the integrated L3 switch will be faster because a)electrons don't have to travel as far and b) the stripping and rewriting of L2 headers can be more efficiently done (if it is necessary at all ) on the integrated L3 switch." The first one is silly. The second one is interesting. I would think that the L2 headers would still have to be rewritten, for traffic going through the router part of the swouter, (my new name for a cross between a switch and a router.) I could believe that it's much more efficent on the swouter than on a router, though. For one thing, the swouter probably has modern hardware components and a more optimized architecture. Anything else you can say on this aspect? Thanks, Priscilla > > > > Agreed - this "might" be a factor only on high end equipment > > passing > > zillions of packets and frames. > > > > > > > > > > > > > > Priscilla > > > > > > The Long and Winding Road wrote: > > > > > > > > wrote in message > > > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > > > Dear All, > > > > > > > > > > Need your advice on the following scenario: > > > > > > > > > > I am using VLANs to provide the partitons for the > traffic > > > > (voice and data) > > > > > from various departments. In order to provide routing > > between > > > > various > > > > > VLANs, I would need a router to do so. > > > > > > > > > > Please advice if there are any difference in the > > > > functionalities etc. if I > > > > > use > > > > > > > > > > 1) a L3 switch for routing between VLANs, > > > > > 2) a L2 switch followed by a router for routing between > > VLANs. > > > > > > > > > > > > > 1) define "functionality" > > > > > > > > 2) define "difference" > > > > > > > > in either case, the net result is the same. for inter-vlan > > > > forwarding on the > > > > same box, the integrated L3 switch will be faster because > a) > > > > electrons don't > > > > have to travel as far and b) the stripping and rewriting > of > > L2 > > > > headers can > > > > be more efficiently done ( if it is necessary at all ) on > > the > > > > integrated L3 > > > > switch. > > > > > > > > once in a while this group has entertained the discussion > of > > > > the relative > > > > merits of L3 switches versus routers. it occurs to me that > > at > > > > the electron > > > > level integrated L3 switching is indeed superior to > > routing, or > > > > at least > > > > inter-vlan routing versus router on a stick. Howard - care > > to > > > > offer your > > > > insight here? I'm talking about things as they happen at > > the EE > > > > level. > > > > Router on a stick has to be "slower" and "less efficient" > > than > > > > integrated L3 > > > > for inter-vlan routing. OTOH, I don't see any advantage > for > > an > > > > integrated L3 > > > > switch acting solely as a router, forwarding traffic from > > > > itself to another > > > > router down the wire, all other things being equal. > > > > > > > > > > > > > > > > > > > > > > > > > Thanks in advance! > > > > > > > > > > Maurice > > > > > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=62222&t=62166 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
