Title: 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.
Assumin
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
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,
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
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
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
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;fa
Title: 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
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
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
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 avai
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
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
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: Fow
f
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
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-&
> 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 CC
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 (
> 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"
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 wi
I am trying to find out about switching on the CCIE lab exam, is there a
particular focus on layer 2 using the set commands, or is it a mix of both?
I am just trying to get an overview of what I need to pass the test, should
I buy the RSM for the Catalyst 500, or should I save my money. Any help
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
Found this interesting link. It wanders a little from the "Layer-3
Switching" subject, but as newbie I found it interesting.
http://www.cisco.com/warp/public/cc/so/neso/lnso/cpso/l3c85_wp.htm
Dave
**NOTE: New CCNA/CCDA List has been formed. For more information
I'm wondering if anybody can point me to some good books on layer 3
switching that gets into technical details on QoS, design, that type of
stuff. We are looking at replacing some of our shared 10 Meg equipment
with 10/100 switches and we are looking at some layer 3 equipment. I am
fam
ot;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 C
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
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
Hi All,
In BCMSN course book (Cisco Press) p233, it is stated that:
"Most Cisco documentation explains flow masks as a way to determine how
packets are compared to entries in the MLS cache. This is inaccurate. Flow
masks are actually used to determine how much information about the packet is
plac
i have a 6506 with a 48prt 10/100 blade i wish to
configure 6 ports on one subnet (vlan2) and the rest on another (Vlan1) and use
the supervisor to route between the two vlans. does anyone have any sample
configs on how to do this. so far i have
created the two vlans and assigned the ports.
t;
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 top
Cisco just released the 2948G-L3 but I still wouldn't put layer 3 in a
closet unless there was a real need for it.
<http://www.cisco.com/univercd/cc/td/doc/product/l3sw/2948g-l3/index.htm>
<http://www.cisco.com/univercd/cc/td/doc/pcat/ca2948g.htm>
For a good reference on Layer 3 switch
Hi,
I have some confuse about the "Fast Switching" and "Layer 3 switching". Both
of them are mentioned that route first packet and switch others. Could
anyone please help me?
Regards.
dovelet
_
FAQ, list archives, and sub
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 i
- Original Message -
From: Mr. Oletu Hosea Godswill, CCNA
To: Ronny Jonathan
Sent: Monday, May 07, 2001 6:18 PM
Subject: Re: Layer 3 Switching Flow Mask [7:3360]
> Me think since MLS has to do with layer 2 up to layer 4. We know that
layer
> 4 has ports numbers and all that. Or
You shouldn't have to do anything else to route
between just those two VLANs. Also just a side note. The mls rp ip
command is not necessary since you are using the MSFC.
""Josh Youngman"" <[EMAIL PROTECTED]>
wrote in message 002801bfcf35$c2e0$[EMAIL PROTECTED]">news:002801bfcf35$ca
I understood, you have to configure mls rp for the
mulitlayer swithing to work, right? why you do not
need mls rp when using MSFC? Is that because the RSM
is on board, it automatically does the multilayer
swithing to the MSFC card?
Thanks
Kent
--- Michael Rasmussen wrote:
> You shouldn't have t
I understood, you have to configure mls rp for the
mulitlayer swithing to work, right? why you do not
need mls rp when using MSFC? Is that because the RSM
is on board, it automatically does the multilayer
swithing to the MSFC card?
Thanks
Kent
--- Michael Rasmussen wrote:
> You shouldn't have t
I just set this up on a 6506 with two MSFCs running HSRP.
MLS is on by default at the switch layer but you still need to define it for
each router interface.
See the Cisco documentation for this at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_5_4/msfc/mls.
h
uot; <[EMAIL PROTECTED]>
> To: "Michael Rasmussen" <[EMAIL PROTECTED]>;
> <[EMAIL PROTECTED]>
> Sent: Tuesday, June 06, 2000 3:28 PM
> Subject: Re: 6506 Vlan and layer 3 switching
> question
>
>
> > I understood, you have to configure mls rp for the
/univercd/cc/td/doc/product/lan/cat6000/sw_5_3/msfc/mls.
htm
- Original Message -
From: "Kent" <[EMAIL PROTECTED]>
To: "Michael Rasmussen" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Tuesday, June 06, 2000 3:28 PM
Subject: Re: 6506 Vlan and layer 3 switchi
uot;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) switchin
sday, 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 say
om: 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 some
onnect
>
> -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 Multi
witching, 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. Mari
ation"
-
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Dove
Sent: Wednesday, March 07, 2001 7:02 AM
To: [EMAIL PROTECTED]
Subject: Confuse about Fast Switching and Layer 3 switching
Hi,
I
|. .|.
>.:|:.:|:.
> c i s c o S y s t e m s Email: [EMAIL PROTECTED]
>
> "Empowering the Internet Generation"
> -
>
>
>
>
>
>
>
> -Ori
>Stuart,
>
>I do not think any packets could be switched without CPU. Fast switching
>needs CPU, it just does not need the CPU to call the ip input process. If
>the router needs to search the routing table, it will need ip input process,
>other than that, the CPU can use cache during one interrupt
I am studying for the CCNP Switching exam and it covers VLANs and layer 3
switching moderately. It states that Cisco recommends a 1 to 1 mapping of
VLANs to subnets. It also states that VLANs can be used to break up
broadcast domains.
When you create different subnets, you are already breaking up
Ok, its 1:29AM CST - and I am setting here chewing on this switching study
guide information about VLANs. I think I see where my confusion has come
from and what the answer is now.
Layer 3 switching does not require VLANs, but what is DOES require is a
physical port connection on the common L3
other
packets with the same source and destination address will go through the
switching process. As I know, the layer 3 switching router is doing the same
job. Then, what is the different between a layer3 switching router and a
router in fast switching?
Regards,
dovelet
Message Posted at:
http
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
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 laye
> > 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
>
Right, I un
> > 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 reco
""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 PROT
that just because it says so in the study materials doesn't mean that's the
way it is.
comments below
""Stephen Hoover"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I am studying for the CCNP Switching exam and it covers VLANs
below
>
>
> ""Stephen Hoover"" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > I am studying for the CCNP Switching exam and it covers VLANs
> and layer 3
> > switching moderately. It states that Cisco recommends a 1 to
&g
t; > can offer
> > that just because it says so in the study materials doesn't
> > mean that's the
> > way it is.
> >
> > comments below
> >
> >
> > ""Stephen Hoover"" wrote in message
> > [EMAIL PROTECTED]
> > -
> > 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.
Oo
hi,
comments in-line:
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
The Long and Winding Road
Sent: Monday, February 17, 2003 3:41 PM
To: [EMAIL PROTECTED]
Subject: Re: Does MLS (Layer 3 switching) require VLANs? [7:63147]
""Vicky Rode&q
""Stephen Hoover"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > -
> > > 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 interfac
HTH,
Thank you for these comments - this clears up a lot of confusion for me.
To sum, just to make sure I really have this:
Layer 3 switching is possible without VLANs (however the opposite is not
true. Well at least not without some form of Layer 3 intervention.)
VLANs simply
end up doing desktop
support.
When I first heard the term Layer 3 switching (some 4 years ago now) the
first thing that popped into my mind was a switch that can route. I never
even heard of a VLAN until a couple of years ago.
The Cisco Study guide starts off talking about VLANs, and moves right int
: 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
e 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]
>
For some reason my responses are taking a REALLY long time to get to the
list in relation to other people's responses, so the conversation is losing
continuity.
I sent an email at 8:55PM CST and I am writing this at 10:19PM CST and my
8:55 post still has not made it to the list.
This is adding to
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 ho
> > > -
>> > 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 po
The nit I'm picking is inline... (I'm feeling like chipping in tonight)
>>> "The Long and Winding Road"
02/17/03 06:13PM >>>
[snip]
if I have a 75xx router with 300 ethernet ports, and I bridge all
those
ports, do I have an L3 switch, or a router?
[KD]
You have a router performing L2 operation
t; 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
t 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
> > on
t: Tuesday, February 18, 2003 12:24 AM
Subject: Re: Does MLS (Layer 3 switching) require VLANs? [7:63147]
> Stephen,
>
> You're getting there. Let me give an example of how VLANs are used
> (I'd draw a picture, but it probably wouldn't look good).
>
> For this e
, 2003 10:07 PM
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
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 comm
>"Vicky Rode" shaped photons and electrons to say:
>
>
>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:
At 5:30 AM + 2/18/03, Ken Diliberto wrote:
>The nit I'm picking is inline... (I'm feeling like chipping in tonight)
>
"The Long and Winding Road"
>02/17/03 06:13PM >>>
>
>[snip]
>
>if I have a 75xx router with 300 ethernet ports, and I bridge all
>those
>ports, do I have an L3 switch, or
E END (hopefully! :-)
Priscilla
>
> If the answer is yes, I will followup with another
> question. If the
> answer is no, then please explain.
>
> Thanks!!
>
> Stephen
> - Original Message -
> From: "Ken Diliberto"
> To:
> Sent: Tuesday, F
E END (hopefully! :-)
Priscilla
>
> If the answer is yes, I will followup with another
> question. If the
> answer is no, then please explain.
>
> Thanks!!
>
> Stephen
> - Original Message -
> From: "Ken Diliberto"
> To:
> Sent: Tuesday, F
Priscilla,
All I want is credit. :-)
"Some guy on one of the many mailling lists I frequent put it this
way:" (maybe not)
Ken
>>> "Priscilla Oppenheimer" 02/18/03 12:06PM
>>>
[snip]
I think Ken's example is one of the cleanest I've seen. I may have to
borrow it for my classes.
[snip]
""Ken Diliberto"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Priscilla,
>
> All I want is credit. :-)
if it makes you feel better, Ken, I always credit you with at least two
cents worth
I'm going to be visiting some of your compadres int the next couple of
weeks. Dare
e 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 P
Howard,
It would be so much fun to not understand some of this up close. :-)
>>> "Howard C. Berkowitz" 02/18/03 06:42AM >>>
[snip]
Does that make a 7500 with VIPs a L3 switch? A 12000 with
distributed forwarding processors?
Substituting router for L3 switch is a good idea, but go farther th
comments in-line:
-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
comments in-line:
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Howard C. Berkowitz
Sent: Tuesday, February 18, 2003 6:42 AM
To: [EMAIL PROTECTED]
Subject: Re: Does MLS (Layer 3 switching) require VLANs? [7:63147]
At 5:30 AM + 2/18/03, Ken
At 6:19 PM + 2/19/03, Vicky Rode wrote:
>comments in-line:
>
>
>-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 s
At 6:51 PM + 2/19/03, Vicky Rode wrote:
>comments in-line:
>
>
>-Original Message-
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>Howard C. Berkowitz
>Sent: Tuesday, February 18, 2003 6:42 AM
>To: [EMAIL PROTECTED]
>Subject: Re: Does MLS
hi,
comments in-line:
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Howard C. Berkowitz
Sent: Wednesday, February 19, 2003 2:17 PM
To: [EMAIL PROTECTED]
Subject: RE: Does MLS (Layer 3 switching) require VLANs? [7:63147]
At 6:51 PM + 2/19/03
at layer 2"
Destination addresses are stored in the high-speed (switching)cache to
expedite forwarding. Routers offer better packet-transfer performance when
fast switching is enabled. Fast switching is enabled by default on all
interfaces that support fast switching.
layer 3 switching diff
Hi, Dovelet
Fast switching is implemented in software(IOS). It is a in-memory cache.
Layer-3 switching normally is implemented in hardware, such as hardware
cache or
ASIC chip.
Michael
"dovelet" wrote in message ...
>Hi all,
>
>I have a question and I hope someone can
Hi,
a layer3 switch (e.g.3550-EMI) does not have layer3 interfaces.
All interfaces (Fastethernet and GigabitEthernet) are layer2
interfaces. They can not have IP addresses.
The VLANs are the (virtual) interfaces to the routing engine
(=layer3 switch).
Layer2 interfaces are grouped into differe
""Jens Neelsen"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi,
>
> a layer3 switch (e.g.3550-EMI) does not have layer3 interfaces.
> All interfaces (Fastethernet and GigabitEthernet) are layer2
> interfaces. They can not have IP addresses.
gentle correction. by entering the
rom: "Jens Neelsen"
To:
Sent: Monday, February 17, 2003 3:28 PM
Subject: Re: Does MLS (Layer 3 switching) require VLANs? YES [7:63147]
> Hi,
>
> a layer3 switch (e.g.3550-EMI) does not have layer3 interfaces.
> All interfaces (Fastethernet and GigabitEthernet) are layer2
&g
comments inline.
--- Jens Neelsen wrote:
> Hi,
>
> a layer3 switch (e.g.3550-EMI) does not have layer3
> interfaces.
> All interfaces (Fastethernet and GigabitEthernet)
> are layer2
> interfaces. They can not have IP addresses.
On the 3550, you can have IP addresses on the actual
interface if
Any difference?
"frank" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Thanks,
>
>
> Frank
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Message Posted at:
http://w
Thanks,
Frank
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=6080&t=6080
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Hi
OK I'll bite...
Yes there is a difference. It gets a little convoluted, but there is a
difference.
L3 switching: Think of a L3 switch as a multi port router that operates at
wire speed. The 2948G-L3 is an example. It is just a 50 port Ethernet
router. So L3 switching is routing traffic at wi
What does the following mean ?it's cut from a description of WS-X4232-L3 on
cisco website.
The Catalyst 4003 and 4006 Layer 3 Services module provides interVLAN
routing for the Catalyst 4000 family switch and provides Layer 3 switching
between the Gigabit Ethernet interfaces.
"Jo
the following packet match the same rule will be directly switched by the
L3-Swtich or MLS-enabled Switch.
Inter-Vlan Routing: This is kind of routing. This first packet and the
following packet will be routed by the router, not switch. So you will find
the Inter-Vlan routing can not provide wire
the following packet match the same rule will be directly switched by the
L3-Swtich or MLS-enabled Switch.
Inter-Vlan Routing: This is kind of routing. This first packet and the
following packet will be routed by the router, not switch. So you will find
the Inter-Vlan routing can not provide wire
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