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Beginner

Subnet for data and voice vlan

When creating a voice and a data vlan on a switch port for an IP phone and a computer which connected to the phone, do the phone and the computer need to be on different subnet or they can be on the same one?

For example, do I have to put the phone on 192.168.1.x/24 while the computer on 192.168.2.x/24, or they both can stay at 192.168.1.x/24?

Thanks.

Regards,

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The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

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In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

Allows you to place an ACL on traffic to/from VoIP subnet.

If subnet is also on a different VLAN, may restrict the number of packets (e.g. broadcast) seen by the VoIP device's NIC.  Also may allow the VoIP device's NIC to filter received packets to just those on its VLAN.

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VIP Expert

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

Phones and data can work on the same subnet/VLAN.

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Beginner

Hi Joseph,

What is the advantage of putting data and voice on different subnet?

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Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

Allows you to place an ACL on traffic to/from VoIP subnet.

If subnet is also on a different VLAN, may restrict the number of packets (e.g. broadcast) seen by the VoIP device's NIC.  Also may allow the VoIP device's NIC to filter received packets to just those on its VLAN.

View solution in original post

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Thanks Joseph for the answer.

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