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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. See Chapter 41, 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 Figure 36-10;
on the C-Series and S-Series, FTOS maps DSCP 46 to queue 2 (see Table 41-5 on page 865 in the QoS
chapter.)
Figure 36-10. Honoring the DSCP Value on Incoming Voice Data
Honor the incoming dot1p value
On the C-Series, if you know traffic originating from the phone is tagged with a dot1p value of 5, you
might make the associated queue a strict priority queue, as shown in Figure 36-11; on the C-Series, FTOS
maps dot1p priority 5 to queue 2.
Figure 36-11. Honoring the Dot1P Value on Incoming Voice Traffic
FTOS#sh run policy-map-input
!
policy-map-input HonorDSCP
trust diffserv
FTOS#sh run int gigabitethernet 6/11
!
interface GigabitEthernet 6/11
description "IP Phone X"
no ip address
portmode hybrid
switchport
service-policy input HonorDSCP
power inline auto
no shutdown
FTOS#sh run | grep strict-priority
strict-priority unicast 2
FTOS#sh run int gi 6/10
!
interface GigabitEthernet 6/10
description "IP Phone X"
no ip address
portmode hybrid
switchport
service-class dynamic dot1p
power inline auto
no shutdown
FTOS#sh run | grep strict-priority
strict-priority unicast 2