Posted on December 21, 2020 4:39 am
 |  Asked by Jeff Lewis
 |  48 views
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Arista 720 XP voice vlan not working for cisco voip phone

Working on configuring voice vlan and data vlan by connecting an endpoint behind the VOIP (cisco ) phone which is connected to Arista 720XP switch on port 2.Like below:

|Arista switch| ——————— |cisco VOIP phone| ———————–|Windows endpoint|

Following is the interface configuration
interface Ethernet2
description port2
switchport trunk native vlan 29
switchport phone vlan 30
switchport trunk allowed vlan 29-30
switchport mode trunk phone

But always the phone is showing on data vlan(29) only but not on voice vlan (30).
arista-720XP#show mac address-table interface Ethernet 2
Mac Address Table
——————————————————————

Vlan Mac Address Type Ports Moves Last Move
—- ———– —- —– —– ———
29 4cbc.489f.5e62 DYNAMIC Et2 1 0:10:05 ago
29 98f2.b301.900e DYNAMIC Et2 1 0:10:14 ago
Total Mac Addresses for this criterion: 2

I configured the port as per the guidance on Arista forums but still the phone not on voice vlan.
Need to see voip phones on voice vlans. It is not on voice vlans with suggested config and so impacting the environment

0
Posted by Yagna Siriki
Answered on January 7, 2021 10:43 pm

Hi Jeff

For VLAN unaware phones, we need to configure 'switchport phone trunk untagged' on the port. Your configuration should be like below:

interface Ethernet2
description port2
switchport trunk native vlan 29

switchport phone trunk untagged
switchport phone vlan 30
switchport trunk allowed vlan 29-30
switchport mode trunk phone

For more information, you can refer to - https://eos.arista.com/configuring-the-campus-voice-vlan/

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