Next Question on ARP with VLANs

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Jul 25th, 2006
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Here is the scenario... First of all I couldnt try it...


Server---3750---3560---2950---Host1


Server---3750 = This connection VLAN1

3750---3560= VLAN2

3560---2950= VLAN3

2950---Host= VLAN1


Assume that there is router with a trunk port connected to 3560.


Here is the question: Can i see the Host MAC on 3750 ARP Table..


Thanx


Ahmet SAAT

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Richard Burts Tue, 07/25/2006 - 07:21
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Ahmet


There are a couple of things in your scenario that need clarification. You mention that the router to 3560 is a trunk but do not specify the connection of 3560 to 2950. If it is a trunk then things may work but if it is not a trunk there is a big problem. If the connection from the 2950 is not a trunk then the connection from 2950 to host is VLAN 1 and if the 2950 to 3560 is not a trunk then the VLAN 1 traffic can not be forwarded.


If there is a trunk from 2950 to 3560 and a trunk from 3560 to 3750 then there would be VLAN interfaces on the 3750 for each VLAN so that it could do inter-VLAN routing. And in this case the MAC of the host would be in the ARP table of the 3750.


HTH


Rick

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