no, IRB is a technique integrating routing and bridging. but switching routers use hardware switching technique which based on layer 3 address not layer 2 address. this is one of the differences between router switches and switching routers. it's my point, pls correct it.
----- Original Message ----- From: "Chuck" To: Sent: Friday, March 15, 2002 11:24 AM Subject: Re: Layer 3 switch ? [7:38358] > so if I enable IRB on my 2501, I now have a layer 3 switch? ;-> > > > ""mlh"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > According to Clark's Cisco LAN Switching(page 452 ), > > layer 3 switching techniques can be grouped > > into two categories: > > Routing switches > > Switching routers > > > > mlh > > > > ----- Original Message ----- > > From: "Larry Letterman" > > To: > > Sent: Friday, March 15, 2002 2:48 AM > > Subject: RE: Layer 3 switch ? [7:38358] > > > > > > > A true router, 2621/3640/7200, is not usually considered > > > a L3 switch. A 6500 with an MSFC module installed can be > > > is a L3 switch and will perform L2/L3 routing and switching. > > > > > > A 6500 without the MSFC module is just a large high speed switch, > > > capable of only L2 switching. > > > > > > A layer 3 switch usually routes the first packet in the flow of data > > > and then switches the rest in the switching hardware. This is why L3 > > > routing/switching is quite a bit faster. A traditional router will use > > > IOS software to determine routes and the switch each packet between the > > > interfaces in the router. > > > > > > > > > Larry Letterman > > > Cisco Systems > > > [EMAIL PROTECTED] > > > > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > > > John Green > > > Sent: Thursday, March 14, 2002 10:50 PM > > > To: [EMAIL PROTECTED] > > > Subject: Layer 3 switch ? [7:38358] > > > > > > > > > Is it ok to refer to a "router" as a Layer 3 switch ? > > > > > > cisco 6500 was referred to as a Layer 3 switch. > > > > > > question: does it(6500) have routing capabilities ? > > > ----------------------------------------------------- > > > > > > to connect to different vlans one needs a router. > > > right ?? (as shown below) > > > switchA --------ROUTER-------switchB > > > > > > but say some nodes connected to switchB are on the > > > vlan of switchA. so now to connect switchA and switchB > > > can router be ok ? > > > ------------------------------------------------------ > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Yahoo! Sports - live college hoops coverage > > > http://sports.yahoo.com/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38493&t=38358 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
