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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