Applying command switchport voice vlan

[mahesh18]

 Hi everyone,

At customer setup they have implemented VOIP and as they have to meet the deadlines for this project and they are in rush  they want all the switch  ports where users are connected should be configured for voice vlan.

As we have server,printers and other devices also connected to these switches.

if i configure int range fa0/1 - 48 with voice vlan command will it cause any issue to devices connected to the switch other than user PC?

Regards

MAhesh

[Poonam Garg · Accepted solution]

Hello,

In order for this to work it must be a cisco phone and CDP must be enabled on your switch.  The switch uses CDP to identify the other device as a ip phone and will automatically place that traffic on the voice vlan.  If this is not a Cisco phone you will have hardcode the phone to tag its traffic as vlan 10.

you might call the connection between the switch and IP phone a "mini-trunk" because a typical trunk passes a large number of VLANs (if not all VLANs). In this case, the IP phone tags its own packets with the correct voice VLAN. Because the switch receives this traffic on a port supporting tagged packets (our mini-trunk), the switch can read the tag and place the data in the correct VLAN. The data packets pass through the IP phone and into the switch untagged. The switch assigns these untagged packets to whatever VLAN you have configured on the switchport for data traffic.

HTH

[mahesh18]

Many thanks Poonam

Regards

MAhesh

[Joseph W. Doherty · Accepted solution]

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Posting

Any issues to ports w/o a VoIP phone but configured with a voice VLAN?  Well, broadcast traffic on the VoIP VLAN will go to each port configured with a voice VLAN, but on a VoIP VLAN I wouldn't expect there to be too much of this traffic.  So it shouldn't be significant.

[mahesh18]

Thanks Joseph for answering the question

Regards

Mahesh