I have to say that I'm a little confused my self!
RSP "Route Switch Processor" is used by the 7500's
RSM "Route Switch Module" can be used by Cat5500 for example.
We have currently 7 5500's with RSM's, and I tell you it is doing all of the
routing for us to include VLANs. Lot's of then.
What I am trying to say here is that I can Route between VLAN's just fine
with an RSM. I think that someone missed typed RSP with RSM.
Paulo
-----Original Message-----
From: Odom, Sean/SAC [mailto:[EMAIL PROTECTED]]
Sent: Monday, August 14, 2000 2:35 PM
To: 'Jeffrey Humphreys '; ''Frank Wells' '; '[EMAIL PROTECTED] '
Subject: RE: Switches !!!
To route between a WAN yes, to resolve VLANs no.
-----Original Message-----
From: Jeffrey Humphreys
To: Odom, Sean/SAC; 'Frank Wells'; [EMAIL PROTECTED]
Sent: 8/12/00 10:53 PM
Subject: Re: Switches !!!
Sean,
I'm confused. Are you saying that if I have a Catalyst 5500 with a RSP
that I will need an additional router (external to the 5500) to route
between VLANs. If that's what your saying, I would have to disagree. I
could do some additional research on it, but I want to ensure that is
what
you are saying.
I believe that the RSP is really just a 7500 and we are running a full
blown
IOS on it to boot. When I do a sho ip ro, I am seeing the local routing
table.
Thanks,
Jeff Humphreys
----- Original Message -----
From: Odom, Sean/SAC <[EMAIL PROTECTED]>
To: 'Frank Wells' <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, August 11, 2000 12:03 PM
Subject: RE: Switches !!!
> Fred
> Switches even with an internal route processor cannot take the place
of a
> router. The first packet in Multilayer switching is resolved by the
> external router. The internal route processor learns from the
forwarding
> decision made by the external router and then uses that resolution for
the
> remainder of the flow from the source to the destination without using
the
> external route processor. Unless the external route router must be
used
as
> a gateway to leave the local boundaries. To answer your question, a
> switched network must still use an external router for Layer 3
resolution.
> Switches using Layer 3 modules merely releive the router of precious
> processing power. Hope this helps. I have two books on switching
which
can
> be used to answer your questions. Visit my website
> www.TheQuestForCertification.Com. -Sean
>
> >Sean Odom, CCNP, MCSE, CNX-EtherII, Author, Instructor
> >GlobalNet Training Solutions
> >[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> >www.TheQuestForCertication.Com
<http://www.TheQuestForCertication.Com>
>
> -----Original Message-----
> From: Frank Wells [mailto:[EMAIL PROTECTED]]
> Sent: August 11, 2000 9:30 AM
> To: [EMAIL PROTECTED]
> Subject: RE: Switches !!!
>
>
> Hey Sean.
> This is regarding the following passage taken from the your previous
reply
> to this thread:
>
> If C. If the destination and source node reside on ports assigned to
> different VLANs on the switch, the switch requires an external router
to
> resolve the address and send the packet back to the switch. <*** If
the
> switch contains an internal route processor, the external router needs
to
> only resolve the first packet and then the internal route processor
can
> finish the job from there. ***> (An external router needs to be used
so
that
>
> a routing protocol can be used to map the network topology to base
it's
> routes.)
>
> The second sentence implies that there will always need to be at least
one
> router in any switched network. Is this actually correct? I seem to
> remember reading that there are fully switched networks utilizing
layer
> three switching as the routing mechanism. What I am getting at is I
thought
>
> Route Switch Processors are layer three devices and fully capable of
making
> their own routing decisions, in which case there would be no need for
a
> router. Can you shed some more light please.
>
> Thanks a lot.
>
>
> >From: "Odom, Sean/SAC" <[EMAIL PROTECTED]>
> >Reply-To: "Odom, Sean/SAC" <[EMAIL PROTECTED]>
> >To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
> >CC: "'Raees Ahmed Shaikh'" <[EMAIL PROTECTED]>
> >Subject: RE: Switches !!!
> >Date: Fri, 11 Aug 2000 09:46:12 -0600
> >
> >a1. How are MAC addresses used on a switch: The MAC address of the
switch,
> >depending on the interface being used, handle this in different ways.
Some
> >Catalyst switches assign a global MAC address, some switches use a
pool
of
> >addresses assigning one to each interface(You can assign one
manually),
and
> >sometimes the MAC address can be a virtual MAC address when using
HSRP on
> >mulitiple internal route processors such as the MSM, RSM, RSFC, NFFC,
> >NFFCII
> >or the MSFC. The switch is assigned an IP address and default
gateway
> >which
> >allows you to telnet to the switch. On most switches you can also
use
the
> >your webrowser to access the switches configuration and make changes
simply
> >by typing in the switches IP address.
> >
> >a2. If two nodes on the same switch want to communicate on the same
switch:
> >(This question requires a long answer!)
> >
> >If: A. They are connected to the same port on the switch the switch
does
> >nothing since the two nodes are in the same collision domain they
will
see
> >each others traffic.
> >
> >If B. They are in the same VLAN and reside on the same switch, the
switch
> >learns the location of each node attached by reading the first frame
> >received and logging the source address and port of arrival in it's
Content
> >Addressable Memory(CAM) table. When the switch receives another frame
it
> >checks the CAM table and if it knows the port the destination node
resides
> >on it forwards the frame directly to that port. If it does not know
the
> >port, it broadcasts the frame to every port which are members of the
same
> >VLAN with the exception to the port of arrival.
> >
> >If C. If the destination and source node reside on ports assigned to
> >different VLANs on the switch, the switch requires an external
router to
> >resolve the address and send the packet back to the switch. If the
switch
> >contains an internal route processor, the external router needs to
only
> >resolve the first packet and then the internal route processor can
finish
> >the job from there. (An external router needs to be used so that a
routing
> >protocol can be used to map the network topology to base it's
routes.)
> >
> >Hope this answers your questions.
> >
> >Sean Odom, CCNP, MCSE, CNX-EtherII, Author, Instructor
> >GlobalNet Training Solutions
> >[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> >www.TheQuestForCertication.Com
<http://www.TheQuestForCertication.Com>
> > -----Original Message-----
> >From: Raees Ahmed Shaikh [mailto:[EMAIL PROTECTED]]
> >Sent: August 08, 2000 11:50 PM
> >To: '[EMAIL PROTECTED]'
> >Subject: Switches !!!
> >
> >
> >
> >
> > If all the ports of the switches have mac addresses than
> >
> >q.1 If somebody telnets to swithes the actual physical communication
> >occurs
> >through which mac address.
> >q.2 If two pcs are connected to the same swithc, and they want to
> >communicate the real communication should go like this ( pc mac-
switch
> >port mac - destination switch port mac - destination pc).
> >
> >Totally confused arp arp arp.
> >
> >Please Help.
> >
> >
> >Shaikh Raees Ahmed,
> >Microsoft Certified Systems Engineer,
> >Systems & Network,
> >IT Division.
> >
> >___________________________________
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>
>
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