Question

Convert csico switch voice and data configuration to Extreme X440-G2

  • 6 October 2020
  • 9 replies
  • 101 views

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Current Cisco Configuration

Interface FastEthernet0/1

Description data & Phone

Switchport access vlan 60

switch mode access

swicthport voice vlan 888

spanning tree portfast

 

I have configured the extreme for voice to be tagged and data to be untagged.

When the phones connect they are connecting on teh data vlan and not voice .. so if I look at teh fdb for the port I have both macs on the data vlan ,,, incidently the phone actually works ..

LLDP is enabled,

configure lldp port 1:6 advertise system-name
configure lldp port 1:6 advertise vendor-specific dot1 vlan-name vlan VOICE-1

configure lldp port 1:6 advertise vendor-specific med capabilities
configure lldp port 1:6 advertose vendor specific power-via-mdi
confgure  lldp port 1:6 advertise vendor-specific med policy application voice vlan VOICE dscp 46

With this configuration , the Polycom phones still boot onto the data vlan ..

 

HAve I missed anything ?

Doi I need to modify the dhcp options on teh DAta vlan ..

 


9 replies

Userlevel 6
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Hello Rod,

if your phones are using untagged and the switchports are using tagged this will not work.

Best practise is using tagged for the phone and untagged for the PC if the PC is plugged into the phone and the phone to the switch.

But for this you have to reconfigure your phones.

Regards

Stephan

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Gents the voice , and vocie 1 is a typo.. Sorry

 

Current config of test port now 1:15

Slot-2 WANDLE-EDGE-1.1 # show configuration | include 1:15

 

enable diffserv examination port 1:15

configure qosprofile QP3 minbw 0 maxbw 100 ports 1:15

configure qosprofile QP6 minbw 0 maxbw 100 ports 1:15

configure lldp port 1:15 advertise vendor-specific med capabilities

configure lldp port 1:15 advertise vendor-specific med power-via-mdi

configure lldp port 1:15 advertise vendor-specific dot1 port-protocol-vlan-id vlan VOICE

configure lldp port 1:15 advertise vendor-specific med policy application voice vlan VOICE dscp 46

 

The vlan is voice tag vlaue 888 protocol any , with all ports tagged , Sorry I cannot give you teh urrent config as My access remotly is limited.. I will try later today ..

Userlevel 6
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Hello Ron,

the command switchport voice vlan {vlan-id | dot1p | none | untagged}} configures how voice traffic ist carried out via a cisco switch.

 

You wrote the portconfig ist “switchport voice vlan 888” which mean tagged to vlan 888. But that doesn't fit with your observation that the phone traffic ends up in the Untagged vlan (on the extreme switch) .

 

To get ahead it would be best to first know for sure if the phone is sending tagged or untagged packets!

 

As Mig mentioned your are using two differen names for voice vlan (VOICE and VOICE-1) why?

Is the vlan ID you are tagged to the phone port 888?

 

What happens if you untag the vlan 888 to the port. Works the phone as expected?

 

You can use two “untagged” vlans on a port. Please read the following KB:

https://gtacknowledge.extremenetworks.com/articles/Q_A/Can-I-add-multiple-vlans-untagged-to-a-port

 

Regards

Stephan

 

 

 

 

Userlevel 6
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Rod,

This is Cisco specific but this can be done also on other equipments.

Anyway, check the lldp config as mention by Christopher and also check the config of the IP Phone to ensure that lldp is enabled. It is usually by default but I’ve seen some IP Phones with lldp disabled by default.

please attach also the output of the fllowing command:

show lldp neighbors detailed

show lldp detailed ports 1:6

Mig

Userlevel 3

Hi Rod,

 

Can you attach the output of the following commands:

show vlan
show conf lldp | i 1:6

Thanks,

Chris Thompson

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Hi went on site again today , and first tried Christophers suggestion, that does not work , the phone do not seem to understand Tag .. as If I connect as untagged in Voice then it all works as expected .

So basaically the phones work , untagged … so a cisco expertout there , what is the difference that they can run two untagged vlans on the same port , as per my original post .. or is this a cisco specific frig.. ( fix )

 

Thanks so far for your help

 

Userlevel 6
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Rod,

In your config you mention VOICE and VOICE-1, I think it should twice the same

Check if you polycom firmwares supports the LLDP-MED and double check the release notes. I’ve experienced some issues with old firmwares and LLDP-MED.

 

I use this with the voice VLAN tagged and the data VLAN untagged:

configure lldp port 1 advertise port-description

configure lldp port 1 advertise system-capabilities

configure lldp port 1 advertise management-address

configure lldp port 1 advertise vendor-specific med capabilities

configure lldp port 1 advertise vendor-specific med power-via-mdi

configure lldp port 1 advertise vendor-specific med policy application voice vlan VLAN200 dscp 46
 

Mig

Userlevel 3

Hi Rod,

 

Can you add this to your lldp configuration as well:

configure lldp port 1:6 advertise vendor-specific dot1 port-protocol-vlan-id vlan VOICE-1

Thanks,

Chris Thompson

Userlevel 4

My first guesses would be either the Voice VLAN is not properly tagged on the port, or the phone is sending out untagged frames. I don’t think LLDP should be impacting your VLAN assignments, that should just advertise the phones capabilities. 

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