RE: Layer 3 switching
Any 6500 series switch can be a layer 3 switch as well as the 3500 series and 2900 series, I believe. Thanks, -- ** Q. Wade Billings Product Operations Manager Excite@Home - The Leader in Broadband _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Layer 3 switching
Muhammad Asif Rashid wrote: > > Any 6500 series switch can be a layer 3 switch as well as the 3500 > series and 2900 series, I believe. With many limitations. Check the documentation. It depends on the environment you want to put the switch into. Same for 2948G-L3 and other "layer 3" devices from Cisco (and other vendors for that matter). You gain lots of speed but lose a lot of traditionl IOS router functionality. Jeff Kell <[EMAIL PROTECTED]> _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Layer 3 switching
Title: Layer 3 switching 2948G-L3 -- Basically a 48-port router! -Original Message-From: Fowler, Joey [mailto:[EMAIL PROTECTED]]Sent: Wednesday, September 27, 2000 11:19 AMTo: [EMAIL PROTECTED]Subject: Layer 3 switching I know there has been much discussion on this in the past, but I want to make sure that I understand it. Layer 3 switching is the equivalent of routing, but is usually referred to as Layer 3 switching because it's designed for high speed LAN traffic. Assuming the above is correct what are some examples of a regular routers vs. layer 3 switch? I'm guessing the 2500 series routers would be regular but what would be a good example of a layer 3 switch? Thanks, Joey Fowler Senior Network Engineer Foodtrader.com
RE: Layer 3 switching
Title: Layer 3 switching I believe the 6000 series can be outfitted with a module to make it a layer-3 switch... -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Fowler, JoeySent: Wednesday, September 27, 2000 11:19 AMTo: [EMAIL PROTECTED]Subject: Layer 3 switching I know there has been much discussion on this in the past, but I want to make sure that I understand it. Layer 3 switching is the equivalent of routing, but is usually referred to as Layer 3 switching because it's designed for high speed LAN traffic. Assuming the above is correct what are some examples of a regular routers vs. layer 3 switch? I'm guessing the 2500 series routers would be regular but what would be a good example of a layer 3 switch? Thanks, Joey Fowler Senior Network Engineer Foodtrader.com
RE: Layer 3 switching
Any 6500 series switch can be a layer 3 switch as well as the 3500 series and 2900 series, I believe. Thanks, -- ** Q. Wade Billings Product Operations Manager Excite@Home - The Leader in Broadband begin:vcard n:Billings;Q. Wade tel;fax:801 234-8350 tel;work:801 234-8316 x-mozilla-html:FALSE org:Excite Business Applications;Product Operations adr:;;700 East Technology Ave;Orem;Utah;84097;USA version:2.1 email;internet:[EMAIL PROTECTED] title:Product Operations Manager fn:Q. Wade Billings end:vcard
RE: Layer 3 switching
Title: Layer 3 switching 6000 series switch, 5500, 4006 have a router module to put in it. -Original Message-From: Iohan Reyes [mailto:[EMAIL PROTECTED]]Sent: Wednesday, September 27, 2000 12:45 PMTo: Fowler, Joey; [EMAIL PROTECTED]Subject: RE: Layer 3 switching I believe the 6000 series can be outfitted with a module to make it a layer-3 switch... -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Fowler, JoeySent: Wednesday, September 27, 2000 11:19 AMTo: [EMAIL PROTECTED]Subject: Layer 3 switching I know there has been much discussion on this in the past, but I want to make sure that I understand it. Layer 3 switching is the equivalent of routing, but is usually referred to as Layer 3 switching because it's designed for high speed LAN traffic. Assuming the above is correct what are some examples of a regular routers vs. layer 3 switch? I'm guessing the 2500 series routers would be regular but what would be a good example of a layer 3 switch? Thanks, Joey Fowler Senior Network Engineer Foodtrader.com
RE: Layer 3 switching
Please correct me if I am wrong, but aren't the 2900 and 3500 layer 2 only? -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Q Wade Billings Sent: Wednesday, September 27, 2000 1:40 PM To: [EMAIL PROTECTED] Subject: RE: Layer 3 switching Any 6500 series switch can be a layer 3 switch as well as the 3500 series and 2900 series, I believe. Thanks, -- ** Q. Wade Billings Product Operations Manager Excite@Home - The Leader in Broadband **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Layer 3 switching
Title: Layer 3 switching
OK,
maybe this is a question of semantics, maybe I'll get flamed, but here goes
anyway. The 6000 series does Multilayer switching, which is quite
different in its functionality than layer 3 switching. Multilayer
switching must still have a layer 3 router available to making the initial
routing decision for a flow. True layer 3 switching uses ASICS to perform
the routing functionality.
Steve
Brokaw, MCSE CCNA CCNP
-Original Message-From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Abruzzese,
JohnSent: Wednesday, September 27, 2000 12:37 PMTo:
Cisco Group Study (E-mail)Subject: FW: Layer 3
switching
-Original Message-From: Abruzzese, John
Sent: Wednesday, September 27, 2000 1:36 PMTo: Iohan
ReyesSubject: RE: Layer 3 switching
The
Catalyst 6000 switch family will do layer 3 switching with the Multi-Layer
Switching Card(MSFC) and the Policy Feature Card(PFC). You can do both Layer 2
& 3 switching in addition to access lists.
-Original Message-From: Iohan Reyes
[mailto:[EMAIL PROTECTED]]Sent: Wednesday, September 27, 2000 12:45
PMTo: Fowler, Joey; [EMAIL PROTECTED]Subject: RE:
Layer 3 switching
I
believe the 6000 series can be outfitted with a module to make it a layer-3
switch...
-Original Message-From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Fowler,
JoeySent: Wednesday, September 27, 2000 11:19 AMTo:
[EMAIL PROTECTED]Subject: Layer 3
switching
I know there has been much discussion on this
in the past, but I want to make sure that I understand it. Layer 3
switching is the equivalent of routing, but is usually referred to as
Layer 3 switching because it's designed for high speed LAN
traffic.
Assuming the above is correct what are some
examples of a regular routers vs. layer 3 switch? I'm guessing the 2500
series routers would be regular but what would be a good example of a
layer 3 switch?
Thanks, Joey Fowler Senior Network Engineer Foodtrader.com
RE: Layer 3 switching
Title: Layer 3 switching In the 6000 family the MSFC acts as the MLS-RP, the equivalent of an RSM or Layer 3 router, and the Policy Feature Card(PFC) acts as the MLS-SE, which basically is the equivalent of the Net Flow Feature Card(NFFC) in the Cat 5000 family. -Original Message-From: Steve and Monica Brokaw [mailto:[EMAIL PROTECTED]]Sent: Wednesday, September 27, 2000 2:48 PMTo: Abruzzese, John; [EMAIL PROTECTED]Subject: RE: Layer 3 switching OK, maybe this is a question of semantics, maybe I'll get flamed, but here goes anyway. The 6000 series does Multilayer switching, which is quite different in its functionality than layer 3 switching. Multilayer switching must still have a layer 3 router available to making the initial routing decision for a flow. True layer 3 switching uses ASICS to perform the routing functionality. Steve Brokaw, MCSE CCNA CCNP -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Abruzzese, JohnSent: Wednesday, September 27, 2000 12:37 PMTo: Cisco Group Study (E-mail)Subject: FW: Layer 3 switching -Original Message-From: Abruzzese, John Sent: Wednesday, September 27, 2000 1:36 PMTo: Iohan ReyesSubject: RE: Layer 3 switching The Catalyst 6000 switch family will do layer 3 switching with the Multi-Layer Switching Card(MSFC) and the Policy Feature Card(PFC). You can do both Layer 2 & 3 switching in addition to access lists. -Original Message-From: Iohan Reyes [mailto:[EMAIL PROTECTED]]Sent: Wednesday, September 27, 2000 12:45 PMTo: Fowler, Joey; [EMAIL PROTECTED]Subject: RE: Layer 3 switching I believe the 6000 series can be outfitted with a module to make it a layer-3 switch... -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Fowler, JoeySent: Wednesday, September 27, 2000 11:19 AMTo: [EMAIL PROTECTED]Subject: Layer 3 switching I know there has been much discussion on this in the past, but I want to make sure that I understand it. Layer 3 switching is the equivalent of routing, but is usually referred to as Layer 3 switching because it's designed for high speed LAN traffic. Assuming the above is correct what are some examples of a regular routers vs. layer 3 switch? I'm guessing the 2500 series routers would be regular but what would be a good example of a layer 3 switch? Thanks, Joey Fowler Senior Network Engineer Foodtrader.com
RE: Layer 3 switching
Title: Layer 3 switching
OK, no
argument from me. It's still Multi-layer switching, not layer 3
switching.
Steve
-Original Message-From: Abruzzese, John
[mailto:[EMAIL PROTECTED]]Sent: Wednesday, September 27,
2000 1:56 PMTo: Steve and Monica BrokawCc: Cisco Group
Study (E-mail)Subject: RE: Layer 3 switching
In
the 6000 family the MSFC acts as the MLS-RP, the equivalent of an RSM or Layer
3 router, and the Policy Feature Card(PFC) acts as the MLS-SE, which basically
is the equivalent of the Net Flow Feature Card(NFFC) in the Cat 5000
family.
-Original Message-From: Steve and Monica Brokaw
[mailto:[EMAIL PROTECTED]]Sent: Wednesday, September 27,
2000 2:48 PMTo: Abruzzese, John;
[EMAIL PROTECTED]Subject: RE: Layer 3
switching
OK, maybe this is a question of semantics, maybe I'll get flamed, but
here goes anyway. The 6000 series does Multilayer switching, which is
quite different in its functionality than layer 3 switching.
Multilayer switching must still have a layer 3 router available to making
the initial routing decision for a flow. True layer 3 switching uses
ASICS to perform the routing functionality.
Steve Brokaw, MCSE CCNA CCNP
-Original Message-From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Abruzzese,
JohnSent: Wednesday, September 27, 2000 12:37 PMTo:
Cisco Group Study (E-mail)Subject: FW: Layer 3
switching
-Original Message-From: Abruzzese, John
Sent: Wednesday, September 27, 2000 1:36 PMTo: Iohan
ReyesSubject: RE: Layer 3 switching
The Catalyst 6000 switch family will do layer 3
switching with the Multi-Layer Switching Card(MSFC) and the Policy Feature
Card(PFC). You can do both Layer 2 & 3 switching in addition to access
lists.
-Original Message-From: Iohan Reyes
[mailto:[EMAIL PROTECTED]]Sent: Wednesday, September 27, 2000
12:45 PMTo: Fowler, Joey;
[EMAIL PROTECTED]Subject: RE: Layer 3
switching
I believe the 6000 series can be outfitted with a module to make
it a layer-3 switch...
-Original Message-From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Fowler, JoeySent: Wednesday, September 27, 2000 11:19
AMTo: [EMAIL PROTECTED]Subject: Layer 3
switching
I know there has been much discussion on
this in the past, but I want to make sure that I understand it.
Layer 3 switching is the equivalent of routing, but is usually
referred to as Layer 3 switching because it's designed for high speed
LAN traffic.
Assuming the above is correct what are some
examples of a regular routers vs. layer 3 switch? I'm guessing the
2500 series routers would be regular but what would be a good example
of a layer 3 switch?
Thanks, Joey Fowler Senior Network Engineer Foodtrader.com
RE: Layer 3 switching
Quoth someone below:"2948G-L3 -- Basically a 48-port router!" Yes, as aforementioned, the 2948G-L3 *can* reside quite readily in Layer 3 land, and configured that way, per port. But, L3 land isn't really switch land, and to just view the G-L3 as a 48 port high-speed router is not getting your Cisco 'bang-for-the-buck". Don't forget ISL/802.1q, VLAN fun, I)ntegrated R)outing and B)ridging and B)ridge V)irtual I)nterfaces. Those nifty, but, for me at least, complex integrations, are a real instructive challenge to your BCSN tasks. The 2948G-L3 is a fairly new addition to the fleet. To that end, there are a couple of URLs providing *some* guidance for setup. Be warned, however, that a good grasp of Cisco LAN Switching should be a prerequisite. Oddly enough, Cisco Press has a book of that title. It's a worthy read. http://www.cisco.com/warp/public/473/25.html http://www.cisco.com/warp/public/473/29.html <http://www.cisco.com/warp/public/473/29.html> http://www.cisco.com/univercd/cc/td/doc/product/l3sw/2948g-l3/rel_12_0/7wx51 5a/config_g/bridging.htm#23388 <http://www.cisco.com/univercd/cc/td/doc/product/l3sw/2948g-l3/rel_12_0/7wx5 15a/config_g/bridging.htm#23388> There is one other link at the Cisco site concerning ISL links to a 2924XL. Don't have that one handy. If any of you gentle readers have some more sample configs, please don't hesitate to contact me, as I'm still fighting the battle. Best, G. "Be strict in what you send, and forgiving in what you receive." -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- George Hartnell, Network Supervisor Bellingham School District, 1306 DuPont St. Bellingham, Wa. 98225-3198 (360)647-6860 [EMAIL PROTECTED] Internet Mail -Original Message- From: Guyler, Rik [EESUS] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 27, 2000 9:00 AM To: Cisco Groupstudy (E-mail) Subject: RE: Layer 3 switching 2948G-L3 -- Basically a 48-port router! -Original Message- From: Fowler, Joey [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 27, 2000 11:19 AM To: [EMAIL PROTECTED] Subject: Layer 3 switching I know there has been much discussion on this in the past, but I want to make sure that I understand it. Layer 3 switching is the equivalent of routing, but is usually referred to as Layer 3 switching because it's designed for high speed LAN traffic. Assuming the above is correct what are some examples of a regular routers vs. layer 3 switch? I'm guessing the 2500 series routers would be regular but what would be a good example of a layer 3 switch? Thanks, Joey Fowler Senior Network Engineer Foodtrader.com **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: LAYER 3 SWITCHING
The answer is, every Cisco switch implements it differently. Try this link, it gives a basic explanation of each switch's method. http://www.cisco.com/warp/public/784/packet/july98/12.html Steve -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of FRS Sent: Wednesday, September 27, 2000 6:55 PM To: [EMAIL PROTECTED] Subject: LAYER 3 SWITCHING I need some help in understanding Layer 3 Switching. 1. What does the process Layer 3 switching refer to? 2. Is it packets or frames being switched out of interfaces or ports? 3. Using the 2948G-L3 as an example, how is the switching determined - by Routing table or CAM table? All help is appreciated. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: LAYER 3 SWITCHING
Title: RE: LAYER 3 SWITCHING Well here are my answers, I wager $700.00 of Jeopardy money. 1. Layer 3 switching is actually routing. It is designed for high speed routing however. 2. For the answer to this question remember your encapsulation from CCNA - Data->segments->packets->frames->bits and back the other way for receiving. So switch would use frames, whereas a layer 3 switch which is really a router, would switch packets. If this is incorrect feel free to let me know. 3. And I just plain don't know without looking anything up on this on. Joey -Original Message- From: FRS [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 27, 2000 7:55 PM To: [EMAIL PROTECTED] Subject: LAYER 3 SWITCHING I need some help in understanding Layer 3 Switching. 1. What does the process Layer 3 switching refer to? 2. Is it packets or frames being switched out of interfaces or ports? 3. Using the 2948G-L3 as an example, how is the switching determined - by Routing table or CAM table? All help is appreciated. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: LAYER 3 SWITCHING
> 1. What does the process Layer 3 switching refer to? "switching" has become a convuluted term. "switching", in marketing-speak, means "fast" for all intents and purposes. Thus, "L3 switching" is "fast routing". Have fun. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: LAYER 3 SWITCHING
Cisco's "layer 3 switching", simply put, refers to all routing processes except process switching (conventional routing with CPU). Namely, any routing process without CPU's intervention is considered "layer 3 switching". This has nothing to do with frames (layer 2) obviously. HTH, Rog > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > FRS > Sent: Wednesday, September 27, 2000 7:55 PM > To: [EMAIL PROTECTED] > Subject: LAYER 3 SWITCHING > > > I need some help in understanding Layer 3 Switching. > > 1. What does the process Layer 3 switching refer to? > > 2. Is it packets or frames being switched out of interfaces or ports? > > 3. Using the 2948G-L3 as an example, how is the switching determined - by > Routing table or CAM table? > > All help is appreciated. > > > **NOTE: New CCNA/CCDA List has been formed. For more information go to > http://www.groupstudy.com/list/Associates.html > _ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Layer 3 switching
> Any 6500 series switch can be a layer 3 switch as well as the 3500 > series and 2900 series, I believe. No. 2900XL and 3500XL run IOS, but canoot perform any routing services. To clarify on your other statement, ANY model in the 6000 series will perform "Layer 3 switching" as long as you have a Supervisor with an MSFC. A 6500 chassis is not specifically required. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: LAYER 3 SWITCHING
FRS, Layer 3 Switching, is not a situation when the CPU isn't involvedThat is Fast Switching, This is actually when routing information is stored in CACHE memory and it is processed without running as many interrupts to the CPU. And YES L3 switching does have everything to do with L2 frames.If it didn't then switches wouldn't be involved[ Layer 3 Switching ] consists of the MLSP Protocol < Muli-Layer Switching Protocol >...What happens is when you have a < Switch(s) / Router > where the Switches have redundant connections to one another and you are running Vlans between the Switches, what do they have to do to get to the other Vlan; they have to go to the router for the packe to be routed since our Vlans are on different subnets.Well what happens is that your switches build a CACHE entry in their MLS Cache and from the information that's in the packet that's stripped they see what port that it was sent out, and they also have the MAC Addresses of the Destination / Source / Port #; just depending on if your running Dst / Src / Port Layer Switching. They then add this to their CACHE entry database and they then switch the packets from there on.Also there is a limited time that this information will stay in the L3 Cache Database ( 256 seconds ) if I remember correctly. Your able to base the switching on Destination / Destination-Source / Destination-Source-Port so then you would actually be doing L4 Switching. HTH. JEK "FRS" <[EMAIL PROTECTED]> wrote in message 8qu1br$9th$[EMAIL PROTECTED]">news:8qu1br$9th$[EMAIL PROTECTED]... > I need some help in understanding Layer 3 Switching. > > 1. What does the process Layer 3 switching refer to? > > 2. Is it packets or frames being switched out of interfaces or ports? > > 3. Using the 2948G-L3 as an example, how is the switching determined - by > Routing table or CAM table? > > All help is appreciated. > > > **NOTE: New CCNA/CCDA List has been formed. For more information go to > http://www.groupstudy.com/list/Associates.html > _ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Layer 3 switching [7:63304]
I'm fairly certain the answer to your first question is no, the switch will not be intelligent enough to switch it to the appropriate port automatically. The reason is that the switch must go through a layer 3 device to get from one VLAN (aka IP subnet) to another. I don't think this is a real issue since the rest of the traffic is switched at wire speed, introducing very little (almost no) latency. There are however switches on the market, even by Cisco that will do this. Any layer 3 switch will do. For example, the Cisco 2948G-L3 switch. Check out their website under "Products and Technologies" for more information. ""Han Chuan Alex Ang"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > hi, I am trying to have a clearer picture of the layer 3 switching > > concept. > > Assuming that I have a Core Catalyst 6 series switch with layer 3 > > switching capabilities, I have a Access layer switch connected to the > > core with two port label Vlan 1 subnet 1 and Vlan 2 subnet 2, > > when frames is sent from from Vlan 1 to Vlan 2 on the same Access > > switch, my understanding is that for layer 3 switching , it will > > evoke a route one and switch the rest concept , my question is that, > > after the first route , if no Access list has been created, will the > > the Access switch be smart enough to perform internal > > switching, that is , frame direct from Vlan 1 to Vlan 2 internally > > within the Access switch. If the answer is no, Are there switches on > > the market that is routing by this concept, please advice , > > thanks to all the guys who have tried to entertain all my questions Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63312&t=63304 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Layer 3 switching [7:63304]
At 1:57 AM + 2/19/03, Han Chuan Alex Ang wrote: >hi, I am trying to have a clearer picture of the layer 3 switching > >concept. > >Assuming that I have a Core Catalyst 6 series switch with layer 3 > >switching capabilities, I have a Access layer switch connected to the > >core with two port label Vlan 1 subnet 1 and Vlan 2 subnet 2, > >when frames is sent from from Vlan 1 to Vlan 2 on the same Access > >switch, my understanding is that for layer 3 switching , it will > >evoke a route one and switch the rest concept , my question is that, > >after the first route , if no Access list has been created, will the > >the Access switch be smart enough to perform internal > >switching, that is , frame direct from Vlan 1 to Vlan 2 internally > >within the Access switch. I'm not sure exactly what you are describing, but the first question in my mind is what MAC address would be in the source field of the frame going to VLAN 2. Could make for some pretty confused ARP tables. Would the IP address have to be rewritten if it now corresponds to a different MAC address? >If the answer is no, Are there switches on > >the market that is routing by this concept, please advice , What problem are you trying to solve? I can't see the difference as involving any significant delay, and I still don't quite see what the subnet relationships will be. > >thanks to all the guys who have tried to entertain all my questions Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63319&t=63304 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Layer 3 switching [7:63304]
Han Chuan Alex Ang wrote: > > hi, I am trying to have a clearer picture of the layer 3 > switching > > concept. > > Assuming that I have a Core Catalyst 6 series switch with layer > 3 > > switching capabilities, I have a Access layer switch connected > to the > > core with two port label Vlan 1 subnet 1 and Vlan 2 subnet 2, > > when frames is sent from from Vlan 1 to Vlan 2 on the same > Access > > switch, my understanding is that for layer 3 switching , it > will > > evoke a route one and switch the rest concept , Layer 3 switching just means routing. What you're talking about is an advanced feature of some switches whereby the L3 core switch can tell the L2 access switch how to encapsulate and forward the packets for this flow on its own in the future. This is sometimes called distributed switching or multi-layer switching, although both those terms get used in other ways too. Many Cisco switches don't support this, but some do. Both the core and the access switch would have to support this advanced feature for it to work. The Catalyst 6000 does support it. The L3 core switch has a route processor in it. It acts as a router. It talks to the L2 access switch's switching engine with a protocol such as Cisco's Multilayer Switching Protocol (MLSP) to let the L2 switch know how to handle the packets in the future. Architecturally it's no different than a router that has a route processor and a forwarding engine, except that now the jobs are being done in two boxes. It's not accurate to equate this behavior with L3 switching. It's more accuate to say this behavior is one feature of some advanced L3 switches. Notice that it requires an additional protocol. It also requires quite a few non-default configuration commands. Priscilla > my question is > that, > > after the first route , if no Access list has been created, > will the > > the Access switch be smart enough to perform internal > > switching, that is , frame direct from Vlan 1 to Vlan 2 > internally > > within the Access switch. If the answer is no, Are there > switches on > > the market that is routing by this concept, please advice , > > thanks to all the guys who have tried to entertain all my > questions > > > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63317&t=63304 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Layer 3 Switching Flow Mask [7:3360]
First, thanks for your answer Drew ... but I'm still confused ... > It determines what information > is stored in the mls entry and enforces all packets > coming through the mls > switch to be compared with the entry according to > the flow mask specified > with set mls flow. How about the note in the BCMSN course book. My interpretation for the note is: The "set mls flow" is to determine what information to be stored in the mls entry (for statistic and data collection purpose), but NOT to enforce packets that go through the mls switch to be compared with the mls entry according to the flow mask specified by the command. > By the way, there is a difference between an L3 > switch and an mls-capable > switch. Make sure you don't get those confused. What is the different ? Are you referring to the RSM/RSFC/MSM/MSFC (MLS-RP) for the layer 3 switch and Cat 5000/6000(MLS-SE) for the mls-capable switch ? Regards, Ronny __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=3378&t=3360 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Layer 3 switching vs. Layer 4 switching?
On TCP/IP that would mean routing using TCP info (i.e. port number). When using certain apps (voice, for example) it's necessary that the router knows what app is it routing (by using upper layer info) so that it gives apps the service they need. Francisco Muniz "Ms. Maria" <[EMAIL PROTECTED]> escribió en el mensaje de noticias [EMAIL PROTECTED] > Hi, > > I was reading Karen Webb book on Building Cisco Multilayer Switched Networks > (BCMSN). I came across some information on Layer 4 switching that somehow I > didn't understand. It says that "Layer 4 switches refer to Layer 3 hardware > based routing that consider the applications. " > I understand the Layer 3 switching that is not logical and etc. But what > about Layer 4 switching??? What new Switches and Routers are supporting > Layer 4 (Transport Layer) switching? > If Layer 3 and Layer 4 switching is same than is there any difference? > Any responses are welcome on this topic. > > Thanks for your time! > > Maria > > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com > > ___ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Layer 3 switching vs. Layer 4 switching?
Layer 4 switching means that a router can forward packets based on L4 information such as TCP port #. This can be used to prioritize specific applications and is currently supported by most vendors. Products from vendors such as Allot, Top Layer and others can even make decisions based on higher level information such as URL. Even more fine grained policy can be enforced using "cookie" switching from vendors such as Arrowpoint (now Cisco), Alteon, Foundry and Extreme (with F5 technology). Irwin -Original Message- From: Ms. Maria [mailto:[EMAIL PROTECTED]] Sent: Wednesday, June 14, 2000 10:58 PM To: [EMAIL PROTECTED] Subject: Layer 3 switching vs. Layer 4 switching? Hi, I was reading Karen Webb book on Building Cisco Multilayer Switched Networks (BCMSN). I came across some information on Layer 4 switching that somehow I didn't understand. It says that "Layer 4 switches refer to Layer 3 hardware based routing that consider the applications. " I understand the Layer 3 switching that is not logical and etc. But what about Layer 4 switching??? What new Switches and Routers are supporting Layer 4 (Transport Layer) switching? If Layer 3 and Layer 4 switching is same than is there any difference? Any responses are welcome on this topic. Thanks for your time! Maria Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Layer 3 switching vs. Layer 4 switching?
We use an Alteon Web Switch that uses "layer 4 switching". I don't know if the concept is the same for cisco switches, but this is how it works on the Alteon: Each web site is assigned a "virtual IP" that is not assigned to any host; it is defined in the switch config. Then we have the web servers that have different real IP addresses. When someone requests a web page, it resolves to the "virtual IP" address. Then the Alteon does some processes in Layer 4 to determine which web server has the least load, then routes the request to that server. I'm sure that Layer 4 switching is not limited to just web switching, but I haven't seen it used for anything else. Does anyone else have any experience with it? Hope that helps with the concept, Francis Arigo, MCSE, CCNA System Administrator Classroom Connect -Original Message- From: Ms. Maria [mailto:[EMAIL PROTECTED]] Sent: Wednesday, June 14, 2000 7:58 PM To: [EMAIL PROTECTED] Subject: Layer 3 switching vs. Layer 4 switching? Hi, I was reading Karen Webb book on Building Cisco Multilayer Switched Networks (BCMSN). I came across some information on Layer 4 switching that somehow I didn't understand. It says that "Layer 4 switches refer to Layer 3 hardware based routing that consider the applications. " I understand the Layer 3 switching that is not logical and etc. But what about Layer 4 switching??? What new Switches and Routers are supporting Layer 4 (Transport Layer) switching? If Layer 3 and Layer 4 switching is same than is there any difference? Any responses are welcome on this topic. Thanks for your time! Maria Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Layer 3 switching vs. Layer 4 switching?
I would think the process of directing to the lest loaded server would be higher in the stack than level 4. Except that the Alteon uses some statefull firewall like table where it remembers the sessions going in to each server, it would probably work best if all the servers are of alike power, wouldn't it? Also, most applications that need a certain QoS would need higher layer switching, as L3 alone won't cut it. Francisco Muniz "Arigo, Francis" <[EMAIL PROTECTED]> escribió en el mensaje de noticias [EMAIL PROTECTED] > We use an Alteon Web Switch that uses "layer 4 switching". I don't know if > the concept is the same for cisco switches, but this is how it works on the > Alteon: > > Each web site is assigned a "virtual IP" that is not assigned to any host; > it is defined in the switch config. Then we have the web servers that have > different real IP addresses. When someone requests a web page, it resolves > to the "virtual IP" address. Then the Alteon does some processes in Layer 4 > to determine which web server has the least load, then routes the request to > that server. > > I'm sure that Layer 4 switching is not limited to just web switching, but I > haven't seen it used for anything else. Does anyone else have any experience > with it? > > Hope that helps with the concept, > Francis Arigo, MCSE, CCNA > System Administrator > Classroom Connect > > -Original Message- > From: Ms. Maria [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, June 14, 2000 7:58 PM > To: [EMAIL PROTECTED] > Subject: Layer 3 switching vs. Layer 4 switching? > > > Hi, > > I was reading Karen Webb book on Building Cisco Multilayer Switched Networks > > (BCMSN). I came across some information on Layer 4 switching that somehow I > didn't understand. It says that "Layer 4 switches refer to Layer 3 hardware > based routing that consider the applications. " > I understand the Layer 3 switching that is not logical and etc. But what > about Layer 4 switching??? What new Switches and Routers are supporting > Layer 4 (Transport Layer) switching? > If Layer 3 and Layer 4 switching is same than is there any difference? > Any responses are welcome on this topic. > > Thanks for your time! > > Maria > > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com > > ___ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > ___ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Layer 3 switching vs. Layer 4 switching?
Francis, The process you have described looks more like "load-balancing"/"load-sharing" - Cisco LocalDirector supports that kind of traffic management. It seems that Layer4 switches do a bit difeerent thing (though mosty of them do load-balancing). We use FoundryNetworks Layer 4 switches in some of our implementatios for redirecting traffic to the WebFilter/cach engine. The switch is able to redirect packets on per-tcp-port basis. For example we have configured ours to redirect all http requests to the WebCache engines and let everything else through RGRDS, Evgeny ""Arigo, Francis"" <[EMAIL PROTECTED]> wrote in message 304545310AD0D3118F9900600897AD9A07743B@GALILEO">news:304545310AD0D3118F9900600897AD9A07743B@GALILEO... > We use an Alteon Web Switch that uses "layer 4 switching". I don't know if > the concept is the same for cisco switches, but this is how it works on the > Alteon: > > Each web site is assigned a "virtual IP" that is not assigned to any host; > it is defined in the switch config. Then we have the web servers that have > different real IP addresses. When someone requests a web page, it resolves > to the "virtual IP" address. Then the Alteon does some processes in Layer 4 > to determine which web server has the least load, then routes the request to > that server. > > I'm sure that Layer 4 switching is not limited to just web switching, but I > haven't seen it used for anything else. Does anyone else have any experience > with it? > > Hope that helps with the concept, > Francis Arigo, MCSE, CCNA > System Administrator > Classroom Connect > > -Original Message- > From: Ms. Maria [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, June 14, 2000 7:58 PM > To: [EMAIL PROTECTED] > Subject: Layer 3 switching vs. Layer 4 switching? > > > Hi, > > I was reading Karen Webb book on Building Cisco Multilayer Switched Networks > > (BCMSN). I came across some information on Layer 4 switching that somehow I > didn't understand. It says that "Layer 4 switches refer to Layer 3 hardware > based routing that consider the applications. " > I understand the Layer 3 switching that is not logical and etc. But what > about Layer 4 switching??? What new Switches and Routers are supporting > Layer 4 (Transport Layer) switching? > If Layer 3 and Layer 4 switching is same than is there any difference? > Any responses are welcome on this topic. > > Thanks for your time! > > Maria > > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com > > ___ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > ___ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Layer 3 switching and VLANs - an epiphany [7:63240]
your still a little off target... Layer 2 interfaces can be access ports or trunks for vlans Layer 2 or Layer 3 switch interfaces dont need to be sub-interfaces.. Layer 3 vlan interfaces(svi) require layer 2 trunk interfaces to interconnect vlans in other switches Layer 3 interfaces only require an ip address and routing support to make them function Larry Letterman Network Engineer Cisco Systems - Original Message - From: "Stephen Hoover" To: > Layer 3 switching does not require VLANs, but what is DOES require is a > physical port connection on the common L3 switch for every IP network that > is connected to the L2 switches. (Hosts on the same L2 switch that are > configured to be in 2 different IP networks.) This is not always possible > nor administratively friendly. > > With VLANs, you can create the equivalent of sub interfaces on a single port > on the L3 switch - hence trunking. You cannot trunk multiple IP networks > (without VLANs) on a single port connection the L3 switch, because you > cannot create Ethernet sub-interfaces... > > That's where I was missing it. > > I think it both Vicki and Jens mentioned something about this. > > Of course if I am off-kilter here, someone please slap me about :) Otherwise > I am confident this is where my misunderstanding really occurred. > > Thanks to EVERYONE who responded - you are all a great group of people to > stick it out until this was beat into my thick skull!!! > > Stephen Hoover > Dallas, Texas [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63243&t=63240 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
