I've just been doing some research for a customer proposal. What I have
found is that the Cisco's so-called layer three switches will natively route
RIP, but if you want more capability you pay for a software enhancement that
will permit OSPF, IGRP, and EIGRP, or in other words, turns the L3 switch
into a real router :->
Is this more or less what you folks are talking about?
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Frank Wells
Sent: Friday, August 11, 2000 11:15 AM
To: [EMAIL PROTECTED]
Subject: RE: Switches !!!
What Sean implied here is you will always need a router to route between
VLAN's. I thought you could use a router (router on a stick)OR
a RSP. He claims that the initial route needs to be found by a router and
then the RSP can take over. I still have a problem with this concept
because I have read about networks consisting entirely of switches from
access layer up to the core layers, and switched across WAN's too!!!
>From: Chris Larson <[EMAIL PROTECTED]>
>To: 'Frank Wells' <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
>Subject: RE: Switches !!!
>Date: Fri, 11 Aug 2000 14:04:36 -0400
>
>You will always need to have a router or a route processor to router
>between
>VLANS. At least with current technology. Layer 3 switching is really just
>being able to processes a route and then forward at switch or wire speeds.
>It still needs to process a route, and is routing between lan segments.
>
>
>In the second part I believe Sean is speaking about Netflow switching where
>the router determines how to route a source/destinatioon once, and once the
>switch learns how that packet was routed through the switch, the next time
>it recieves a similiar source/destination that normaly would require route
>processing it will just switch the packet to the appropriate port based on
>what it learned the last time without asking the router to process a route.
>
>
>
>-----Original Message-----
>From: Frank Wells [mailto:[EMAIL PROTECTED]]
>Sent: Friday, August 11, 2000 12:30 PM
>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.
> >
> >___________________________________
> >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]
>
>________________________________________________________________________
>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]
________________________________________________________________________
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]
