Reference Guide

746 | Power over Ethernet
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!
interface Vlan 200
description "Voice VLAN"
no ip address
tagged GigabitEthernet 6/10-11,22-23,46-47
shutdown
!
interface Vlan 300
description "Voice Signaling VLAN"
no ip address
tagged GigabitEthernet 6/10-11,22-23,46-47
shutdown
Configure LLDP-MED for an Office VOIP Deployment
VOIP deployments may optionally use LLDP-MED. LLDP-MED advertises VLAN, dot1P, and DSCP
configurations on the switch so that you do not need to manually configure every phone with this
information. Refer to Chapter 29, Link Layer Discovery Protocol. Based on the configuration in the
example below, the phone will initiate a DHCP request on the advertised voice VLAN, VLAN 200.
FTOS#show running-config lldp
protocol lldp
advertise med
advertise med voice 200 6 46
advertise med voice-signaling 300 5 28
no disable
FTOS#show lldp neighbors
Loc PortID Rem Chassis Id Rem Port Id
-------------------------------------------------------------------------
Gi 6/10 0.0.0.0 001B0CDBA109:P1
Gi 6/11 0.0.0.0 001AA2197992:P1
Gi 6/22 0.0.0.0 08:00:0f:22:7f:83
Gi 6/23 0.0.0.0 08:00:0f:23:de:a9
Gi 6/46 0.0.0.0 00:07:3b:c7:d1:e5
Configure Quality of Service for an Office VOIP Deployment
There are multiple ways you can use QoS to map ingress phone and PC traffic so that you can give them
each a different quality of service. Refer to Chapter 44, Quality of Service.
Honor the incoming DSCP value
On both the C-Series or S-Series, if you know traffic originating from the phone is tagged with the DSCP
value of 46 (EF), you might make the associated queue a strict priority queue, as shown in the example
below; on the C-Series and S-Series, FTOS maps DSCP 46 to queue 2 (refer to (Table 44-5) in the QoS
chapter.)
FTOS#sh run policy-map-input
!
policy-map-input HonorDSCP
trust diffserv