SG300G-28P Auto Voice Vlan configuration

[gregorysieg]

Quick overview of my setup:

4 Buildings all interconnected by Fiber in 1 LAN.  4 Vlans - Data (Default Vlan), Voice 1, Voice 2, and Guest.  The vendor doing phones reccomended 2 Voice Gateways for their installation thus requiring 2 seperate Voice Vlans.

Building A and B are on Voice 1

Building C and D are on Voice 2

Building A has Gateway 1 which runs on Voice 1 (Vlan 52)

Building C has Gateway 2 which runs on Voice 2 (Vlan 53)

Building A/B/C are all working great.  The switches in Building D for some reason keep wanting to use Vlan 52 (Voice for Building A/B) in it's configuration even though I set the Voice Vlan to 53.  So If I disabled the Auto Voice Vlan the phones get no LLDP settings and do not work at all.

Is anyway I can configure the switch to use Vlan 53 as the primary voice vlan?  My other option is to configure my DHCP with all the options but since its working on 5 out of 7 switches I'd like to get these other 2 switches working also.

Or is there a way I can disable it but keep LLDP so I do not have to configure the DHCP settings?  If not I will just disable.

[Tom Watts]

Hi Gregory, it is possible the uplink port at building D is receiving an advertisement to configure the voice VLAN as VLAN 52 either via CDP or LDP.

Try to disable the autosmart port macro for the uplink port and CDP/LDP for that particular link and see if it helps that situation.

[mohabdel]

Hi Gregory,

As I can understand you have 4 switches

switch A for 1st switch,  switch B for 2nd switch, switch C for 3rd switch, switch D for 4th switch.

first you need to loging to switch A  and do this following

config t

Switch A# config t

Switch A<config>

Switch A<config># spanning-tree priority 0

end

config t

Switch B# config t

Switch B<config>

Switch B<config># spanning-tree priority 4096

end

config t

Switch C# config t

Switch C<config>

Switch C<config># spanning-tree priority 8192

end

config t

Switch D# config t

Switch D<config>

Switch D<config># spanning-tree priority 12288

end

now we need to fix vlan issue

I will give you example and you need to try it in your switch

this switch support only 1 voice vlan work with smartport  so if you want config two voice vlans you need to use other vlan as this following

config t

Switch A# config t

Switch A<config>

Switch A<config># int range gi1-3

Switch A<config-if-range># switchport mode trunk

Switch A<config-if-range># switchport trunk allow vlan add 52

Switch A<config-if-range>#switchport trunk native vlan 1

Switch A<config># int range gi4-6

Switch A<config-if-range># switchport mode trunk

Switch A<config-if-range># switchport trunk allow vlan add 53

Switch A<config-if-range>#switchport trunk native vlan 1

end

wish my issue will help

Thanks,

Moh