Junos OS

Hi experts,

Looking for some help for straight forward VOIP configuration (PC plugged into Phone plugged into access interface) on EX switch.

I taught the data vlan just needs to be configured on an access interface as the interfaces only vlan member and the voice vlan/interface needs to be configured under "switching-options voip". However this document

https://www.juniper.net/documentation/en_US/junos/topics/example/802-1x-pnac-voip-no-802-1x-ex-series-configuring-els.html

contradicts that and shows an extra step where the interface is also configured in switch-options underneath the VLAN. Similar in ways to how non-els voip configuration was done. E.g

vlans {

     data-vlan {

          vlan-id 77;

          switch-options {

                interface ge-0/0/2.0;

I originally taught this was a mistake in the document but have found the same configuration it in at least one other reference (the JNCIE-ENT Self study bundle).

So can any explain why the interface being configured for the VOIP vlan needs to be configured under both Switch-options->Voip and also under vlan->vlan-name->switch-options. Need to know for exam purposes, in practice I have deployed this without the vlan->vlan-name->switch-options and it seems to work just fine. 

Thanks

Hi alkavana,

Greetings, I can confirm and guarantee that this portion of the configuration is not needed: 

    switch-options {

                interface ge-0/0/2.0;

Not sure why it is there but again it is not needed for VoIP, and there is a lot of documentation that does not have this configuration, the official Juniper training material for JNCIP-ENT does not have this configuration either. 

The switch-option under the VLAN hierarchy is used to configure Layer 2 learning and forwarding properties for a set of bridge domains/vlan such as the following:

• interface-mac-limit
• mac-statistics
• mac-table-size
• no-mac-learning
• packet-action

None of these are needed or related to VoIP minimum required configuration.

If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/

Regards,

Lil Dexx
JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB