PowerConnect 2724 - Managed Mode - Interfacing with A Cisco Router

Question

My Company just purchased a PowerConnect 2724 switch. We placed the switch in Managed Mode. Two VLANs have been created, VLAN 10, and VLAN 20. These VLANs have also been established on a CISCO router that we need to interface to the switch. VLAN 10 will be used for private interfaces on different computers, and VLAN 20 will be used for the computers public interfaces. Ports 2 through 12 belong to VLAN 10, and 13-24 belong to VLAN 20. Port 24 belongs to both VLAN 10 and 20. This was done in an attempt to create a form of a 'Trunk' port. All traffic should be forwarded out the trunk port so traffic can be routed by the CISCO router. I was wondering if this has been done by anyone, and if so, how was it accomplished.

DELL-Cuong N. · Answer

You can create this configuration using the web management interface on the 27xx.  Here is the link to the section in the manual on how to setup VLAN on the switch: http://support.dell.com/support/edocs/network/PC27xx/en/ug/system.htm#1105442 (search for 'Creating VLAN Membership').   Just create two VLANs as you described then add the ports to those VLANs also as you described.  The only thing to make sure of is on the access ports (the ports that is not the trunk port belonging to both VLANs) make sure that the PVID on each access port is set to be the same as the VLAN to which those ports belong (e.g. if port 2-12 belong to VLAN 10, then add these ports to VLAN 10 and then go to the VLAN port setting for each of those ports and configure the PVID to be 10).  This is necessary so that untagged traffic will be properly tagged with the VLAN number of the access port.  Then make sure that the trunk port belongs to both VLANs as you described.  Also on the trunk port if you do not want untagged traffic to be allowed on the port then set the PVID of the port to the discard VLAN (4095).  If you want untag traffic on the trunk port to be dropped onto the public VLAN instead or some other VLAN then set the PVID on the port to whatever the VLAN number you want it to go to automatically when the packet is untagged.   Cuong.

su_A_ve · Answer

Could you clarify this a bit ?  I'm a newbie and this is pretty much the same I'm trying to do (Connecting to a Cisco 2950 port set up as trunk mode).   If I connect the 2724 port 24 to the cisco (whose port I assume should be set as 802.1q Trunk?) what settings should it have ?    It would belong to both vlans as you say, but what about the PVID ?  Should that be left with the default settings ? ie PVID 1, Frame Type Admit All ?   Also, the ports (not the trunk one) where systems connect to, should they be set to T or U ?   Thanks in advance. Message Edited by su_A_ve on 10-03-2005 05:14 PM

DELL-Cuong N. · Answer

On the trunk port (port 24), add this port to both your VLANs. Since this is a trunk port, likely you will not want "untagged" traffic to be admitted to the port since you only want the VLANs configured to go through the two swiches (27xx and the Cisco switch) to pass through the trunk, you should set the "Frame Type" to "Admit Tag Only". This means that only packets that are tagged with the VLAN ID to which the trunk port also belongs will be allowed to pass through the trunk port. You may set the PVID to 4095 which is the discard VLAN so that when untagged traffic are sent to the switch it will be discarded. You may also set the PVID to either of the two VLANs to which this port belongs since you also setup the "Frame Type" to "Admin Tag Only" it means that the switch won't accept untagged anyway. I don't think you want to leave the PVID to 1 though.

On the access ports, you should set the VLAN membership to whatever VLAN they supposed to be and make sure the PVID for those ports are also setup to the same VLAN #. Set the mode to "U" for untagged in the VLAN membership page. This means that when the packet is accepted on the port, if it is untagged it will automatically be tagged as the correct VLAN # (based on PVID). If packet is sent out the port it will be sent "untagged". This means that your NICs on the host connecting to these access ports need not be VLAN aware. Otherwise you have to setup these NICs to tag traffic with the correct VLAN #.

Cuong.

DELL-Cuong N. · Answer

BTW on the trunk port make sure you add the VLAN membership as "T".

Also it seems that you posted your question twice? I'm answering this question here but noticed that I'm also answering the same question also from you on another thread :-). I guess if this thread is answering your question then I'm going to ignore the other one.

Cuong.

su_A_ve · Answer

Yes, I posted the message twice you could say not noticing that one is under the managed switches, and the other on the unmanaged switches forums...

The 27xx series technically belongs to both, and this question to the managed side of things.

Thanks. I only have a problem with not being able to TAG VLAN 1 (posted another message about it in the unmanged forum).

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PowerConnect 2724 - Managed Mode - Interfacing with A Cisco Router

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