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-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Kelly Cobean Sent: Tuesday, February 18, 2003 7:54 PM To: [EMAIL PROTECTED] Subject: RE: Does MLS (Layer 3 switching) require VLANs? [7:63147] Priscilla, Ok, you caught me not telling the whole truth. There is a second VLAN on the switch, but my point was that the MLS cache is full of entries for one host talking to another host off of the same VLAN interface but on a secondary subnet, indicating that L3 switching (routing) took place for that data-flow...So now I guess there are two hands clapping ;-) You sure do keep us all on our toes!!! Thanks! ----------------------------- that's because packet switching between subnets using secondaries are process-switched. regards, /vicky -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, February 18, 2003 1:08 AM To: [EMAIL PROTECTED] Subject: RE: Does MLS (Layer 3 switching) require VLANs? [7:63147] I'm loath to continue this discussion, but I do have a question for Kelly. Why do you have a VLAN at all in your example?? Isn't a single VLAN sort of like one hand clapping? Seriously, what role is it playing in your network? Of course you don't have to have VLANs to do routing/L3 switching, as you probabaly know. But maybe there's some weird configuration gotcha, specific to the 6509? Just curious. Thanks. Larry said the majority of the Cisco campus is networked with L3 switches and not using vlans. That says a lot right there! Priscilla Kelly Cobean wrote: > > All, > I'd like to add to this something that I haven't seen in > other posts yet, > and that is a quick look at layer2 function. I have a Catalyst > 6509 with an > MSFC on it. There is only *ONE* VLAN configured on the MSFC, > however, that > VLAN has several secondary addresses assigned to it (I know, > not a great > solution, but let's not go there). If I do a "show mls entry" > on my switch, > it is full of entries for hosts talking to hosts on the same > VLAN. My > point? When a host wants to talk to a host on another subnet > (VLAN or not), > it ANDs the address with it's own mask, determines that the > host is in fact > on a different subnet, then arps (if necessary) for it's > default gateway > (the MSFC) and sends the packet on it's way. The 6509/MSFC > receive the > packet and begin the MLS cache setup process (candidate packet, > timeout, > etc). All this is still done inspite of the fact that the MSFC > only has a > single VLAN. > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On > Behalf Of > Stephen Hoover > Sent: Monday, February 17, 2003 8:33 PM > To: [EMAIL PROTECTED] > Subject: Re: Does MLS (Layer 3 switching) require VLANs? > [7:63147] > > > > > ------------------------- > > > 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. > > > Oooooo ok, now THAT statement leads me to believe the L3 > switching IS > possible without VLANs. > > > -Stephen Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63371&t=63147 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
