""Vicky Rode"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > comment in-line: > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Monday, February 17, 2003 2:10 AM > To: [EMAIL PROTECTED] > Subject: RE: Does MLS (Layer 3 switching) require VLANs? [7:63147] > > > DEar Stefen, > > you are doing a bit of confusion: > > > so does layer 3 switching require the use of VLANs to actually do > > the switching? > > It's true the contrary case: the Vlans requires L3 to be routed, or, in > other terms, to comunicate each others. The L3 switching has no sens without > VLAN > > > Say for instance I have 2 hosts on the same layer 3 switch, but the > two > hosts are on 2 different IP subnets (No VLANs are defined). > > That's not possible! if you are talking about 2 IP subnet, than: > ------------------------- > actually it is by doing secondaries, but i would highly recommend doing > vlans if possible. keep it clean and simple.
one may also configure the physical interfaces as L3 interfaces - just as one might do on a router with several ethernet ports. > > > > > /vicky > > > 1) you are talking about 2 subnet in 2 distinct sides of a router > 2) you are talking about 2 Vlans in one L3 switch > > > Host A wants to talk to host B. Can the switch not look up the > > routing info and then know to switch to that port? I am not seeing > where > the requirement for the VLAN comes into play. > > 1) host A and Host B are in two different VLAn: they need the L3 engine to > comunicate > 2) host A and host B are in the same Vlan but they have IP addresses (be > careful .... this anyway a mistake!) who belongs to different VLAN: A can't > comunicate with B because A doesn't know the MAC of B ... A can have > knoledge of the MAC's of > a) the hosts in the same subnet > b) the gateway of the A's subnet > and B's MAC doesn't match either of the a and b case. > > Hope this halp you > > Greetings > > Luca Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63186&t=63147 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
