hi stephen,
see comments in-line: -----Original Message----- From: Stephen Hoover [mailto:[EMAIL PROTECTED]] Sent: Monday, February 17, 2003 11:20 AM To: Vicky Rode Cc: [EMAIL PROTECTED] Subject: Re: Does MLS (Layer 3 switching) require VLANs? [7:63147] > > 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. > Vicki, You mention the use of secondary IP's. On a L3 switch (a switch with the router engine in it) is it not possible to define Ethernet sub interfaces instead of using secondary IPs - without VLANs defined? ---------------------------- yes you can but when you create sub-interfaces it ask for encapsulation type and this is where vlans come into play. whereas with secondaries it will route between the subnets. I'm sorry to be so thick, I'm just not getting it. If a L3 switch (with a routing module/engine in it) is essentially a wire speed router, then the VLAN just seems like an additional identifier on top of the L3 address - and doesn't really serve any purpose. In my previous example, 2 hosts on the same L3 switch, but on 2 different IP subnets - wouldn't a defined Ethernet subinterface be each clients respective gateway, and thus normal L3 routing would occur, just at switch speeds???? --------------------- ....well let me you ask this, why not just supernet and put all stations on the same subnet (don't do this i'm being facetious). that's because you do not want to create this huge broadcast domain. that's the whole purpose of having vlans. if this still doesn't make sense, feel free to ask...would love to help. regards, /vicky Thanks again! Stephen Hoover Dallas, Texas Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63228&t=63147 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
