Comments on: Enabling communication between different VLANs using switches http://itknowledgeexchange.techtarget.com/itanswers/enabling-communication-between-different-vlans-using-switches/ Mon, 20 May 2013 13:53:06 +0000 hourly 1 By: patilnet http://itknowledgeexchange.techtarget.com/itanswers/enabling-communication-between-different-vlans-using-switches/#comment-73584 patilnet Tue, 09 Feb 2010 10:18:51 +0000 #comment-73584 If there is a trunk bettween Switch A &Switch B and Switch B & Switch C then only Switch A user can Ping Switch C users
Because trunk carrries multiple VLAN database

]]> By: jfernatt http://itknowledgeexchange.techtarget.com/itanswers/enabling-communication-between-different-vlans-using-switches/#comment-63120 jfernatt Tue, 05 May 2009 00:26:36 +0000 #comment-63120 I have to say to answer your question… It depends…

There are several factors that would determine whether or not your endpoints could ping one another. If all switches are trunking and VLAN 10 exists and is allowed on the trunk links across all switches they will be able to ping. However they do not HAVE to trunk. In fact switch B does not even HAVE to use VLAN 10 for the ports connecting to each other switch as long as both of those ports are in the same VLAN.

Things that would make the endpoints unable to ping include trunked ports that do not allow your specific VLAN or if the 2 ports on each switch are not in the same vlan if they are configured as access ports.

And I am assuming the 2 endpoints share the same IP subnet…

]]> By: Troy Tate http://itknowledgeexchange.techtarget.com/itanswers/enabling-communication-between-different-vlans-using-switches/#comment-63110 Troy Tate Mon, 04 May 2009 20:36:32 +0000 #comment-63110 You don’t mean “collision” domain do you? That’s a hub characteristic. I think you mean “broadcast” domain. It depends on whether the broadcast domain is at layer 2 or layer 3. This is done through variable length subnet masks and how you roll-up the network addressing scheme.

I agree that trunking will need to be enabled on the uplink ports between each of the switches. Note that not all switches implement trunking the same way.

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