Voice VLAN Setup SG500-28P

[andym5041]

Tomorrow I will be setting up a simple router and switch configuration in a small office.  The network will be a flat network with no seperate vlan for voice and data.  We will have Cisco 7961 Cisco phones connecting back to our main office via a site-to-site VPN.

I see that the SG500 CLI is a whole different animal compared to the enterprise switch CLI.  In the enterprise CLI it would be easy for me to setup a switch port for a phone and PC sharing the same port and vlan with the following command:

interface range f0/1-24

  switchport mode access

  switchport voice vlan dot1p

  spanning-tree portfast

  spanning-tree bpduguard enable

In the SG500 documentation it states that the "voice vlan state" is set to auto-triggered by default.  The document also states that all ports are members of VLAN1 which is also the default voice vlan.  I will not specify a voice vlan hoping the phoe will get put into vlan1.  What this being said, when we plug in the 7961 the following will happen:

1. CDP from the 7961 will auto-trigger the voice vlan and put the phone in default vlan1.  The workstation (data) will also be in vlan1.

2. Voice traffic will be prioritized over the data traffic using the 802.1p protocol?  I will have set "qos basic" at the global level.

Does this sound right?  If it is, I shouldn't have much setup to do.

[Tom Watts]

Hi Andy, if you have an upstream device advertising the CDP messages for voice and data VLAN, in theory it will auto configure the switch. If that is not the scenario then you would need to configure the Voice VLAN feature on the switch to feed the phones information.

Also in the past, I actually made a lab with a 2960 connecting to a SX300. I wrote a LLDP policy on the 2960 and it "auto configure" my SX300 in a default state. You can become very creative if your goal is to miminize the configuration of the small business product.

For some ideas check these out-

https://supportforums.cisco.com/thread/2180209

https://supportforums.cisco.com/docs/DOC-27005

If you result in configuring the SX500 switch

config t

vlan database

vlan xxx (voice vlan)

exit

voice-vlan state auto enable

voice-vlan id xxx

With this, provided the phone will pick up the CDP message correctly from the switch, it should data vlan untag, voice vlan tag the phone to the port.

-Tom
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[andym5041]

Thanks for the quick response Tom.  My goal is to have the data and voice traffic on the same vlan.  I would like to make it simple and have them land in the default vlan1 where the router default gateway is sitting.

config t

vlan database

vlan 1

exit

voice-vlan state auto enable

voice-vlan id 1

Would this work?

[Tom Watts]

Yep

-Tom
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[andym5041]

Since voice and data will share vlan 1, will the voice traffic have priority over the data traffic?  Will I need to enable "qos basic" at the global level?

[Tom Watts]

If the phone used tag packet, 802.1p automatically applies. QOS Basic is enabled by default.

-Tom
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