SG300 Running a Data VLAN and Voice VLAN completely independantly from One another

SG300 Running a Data VLAN and Voice VLAN completely independantly from One another

So…. Ive got to say SG300 Switches can be a pain to configure. Some of the logical things you learn with other Cisco products just does not apply. With VoIP becoming more popular and affortable SMB are finding that they need to have some form of managed switch to facilitate PoE so its becoming more of a popular choice

I have written this guide in order to explain how to configure a SG300 Switch to allow the 2 networks to exist side by side and there is a few reasons

1) It seems to be something that is not easy to find on the internet
2) To get it straight in my own head
3) No doubt I will need this in months to come and I will have completely forgotten

Basic Config on the Switch

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So. We need to do the basic configuration as we would

– Change Username and password
– System Contact Information
– Hostname
– IP Address / Subnet Mask
– Defualt Gateway on your data or Managment network if you choose to have one. This is very important should you ever need to troubleshoot any Networking loops

Create a VLAN for the telephone network

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We need to create a telephone VLAN so we are seperating Voice and Data Traffic

Tag All of the Voice data in your Phone Vlan

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Although you may not have delcided as to what poerts are going to be a computer and which will be phones. We still need to tagg all access ports in our Phone VLAN

1) Select the VLAN equals from the drop down
2) Click Go – This is very important as you will end up modifying the wrong VLAN
3) Sellect Taged

There are ports that you don not want to tag. If they are as follows
– The Port is an Uplink to another switch and thus a Trunk then it needs to be EXCLUDED

Exclude your Data Network (PC) from your Phone VLAN

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As we are configuring VLAN 2 in this example – which is our Phone VLAN we need to EXCLUDE our port which is our VLAN 1 connection our Router/ASA

Exclude Phone VLAN from PC Network

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As per the above we need to configure VLAN 1 or our Data Network and exclude the Port for VLAN 2 for the port that connects to the ASA or router

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Port To VLAN Membership – for Trunkports /Uplimks

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This is an important step to ensure that we are passing data for both VLANS

1) Select the porlt which will be acting as your uplink
2) Click Join VLAN
3) We need to remove both VLANS from the right hand box by selecting them and selecting to the left . You will then see 4095. we can then add them back from the left hand box. ensuring that the ‘Tagged’ Option is selected

Apply and Save changes

Configuring Auto Voice VLAN

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Now we have both of our VLANS configured we need to configure our switch so that it looks at the MAC address of dvices plugged in and if it is a phone then it will auto add it to our Voice VLAN – In this case VLAN 2

First we need to ensure the MAC Address is in the Telephone OUI . if its not then we can add it

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we need to ensure that our outo Voice VLAN is set to the correct one. in this case ‘2’


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