vlan without assigning ip address

Question

I have  a 6248 Dell switch with following vlan's created interface vlan 2name 'ISCSI1'exitinterface vlan 3name 'ISCSI2'exit interface vlan 4name 'CSV'exitinterface vlan 5name 'LiveMigration'exit And have interfaces assigned to the vlan's. interface ethernet 1/g2spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit !interface ethernet 1/g3spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit!interface ethernet 1/g4spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit!interface ethernet 1/g5spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit !interface ethernet 1/g6spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit!interface ethernet 1/g7spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit!interface ethernet 1/g8spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit !interface ethernet 1/g9spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit!interface ethernet 1/g10spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit!interface ethernet 1/g11spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit !interface ethernet 1/g12spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit!interface ethernet 1/g13spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit!interface ethernet 1/g14spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 4exit !interface ethernet 1/g15spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 4exit!interface ethernet 1/g16spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 4exit!interface ethernet 1/g17spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 5exit !interface ethernet 1/g18spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 5exit!interface ethernet 1/g19spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 5 However there is not ip address assigned to vlan, No network is assigned to any vlan. My question is are these vlan active and then how are they communicating with each other?

DELL-Josh Cr · Accepted Answer

Hi,

You don’t need an ip address for VLANs to work. VLANs are a layer 2 technology, they can separate networks without the VLAN itself being assigned an IP address. Assigning it one may help with routing, but is not required. The VLANs are active. Frames are tagged depending on which port they came from. Tagging is done at the port level in layer 2. It creates separate broadcast domains for the network. If a broadcast goes out on VLAN 4 in your setup G14,15 and 16 will all get the broadcast.

DELL-Josh Cr · Accepted Answer

They are not on the same subnet if they are in different VLANs, they can use the same IP range, but it would be the same as having two switches and them not being connected and using the same IP range. If you have routing enabled you need to use different IP ranges for VLANs for it to work properly.

mahimakundu · Answer

Hi Josh,

thank you for quick response. It might sound like a stupid question, however I am confused, will the devices in different vlan will be able to communicate with each other without any inter vlan routing.

DELL-Josh Cr · Answer

For different VLANs to communicate there has to be routing, you can either do it with intervlan routing on the switch or you can use a separate router.

mahimakundu · Answer

Josh I am really not able to understand one thing here

if all the vlans are on same subnet as there is no ip address segmentation done for vlan's.

Though ports are assigned to vlan.

will they really need ip routing to communicate with each other

Networking General

vlan without assigning ip address

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