Quality of Service, VC-848 | Cisco Systems VC-825 guide

Cisco Hoot and Holler over IP

Configuration Examples

Quality of Service

Voice traffic is much more sensitive to timing variations than data traffic. For good voice performance, configure your data network so that voice packets are not lost or delayed. The following example shows one way to improve QoS for voice multicasting over a Frame Relay connection:

!Configure physical interface for transmitting multicast packets. !Listen to packets of Session Announcement Protocol (SAP).

!This example uses a subinterface

interface serial0/0 encapsulation frame-relay frame-relay traffic-shaping no frame-relay broadcast-queue

interface serial0/0.1 point-to-point ip address 5.5.5.5 255.255.255.0 ip pim sparse-dense-mode frame-relay class hootie frame-relay interface-dlci 100 frame-relay ip rtp header-compression

!
!Frame relay	class commands.
!
map-class frame-relay hootie
frame-relay	cir 64000
frame-relay	bc 2000
frame-relay	mincir 64000
no frame-relay adaptive-shaping
frame-relay	fair-queue
frame-relay	fragment 80
frame-relay	ip rtp priority 16384 16383 64

Note In the frame-relay ip rtp priority command, the first number is the audio port. The second number is the number of consecutive audio ports to which the IP RTP priority queuing applies. The third number is the bandwidth, which should equal the bandwidth needed for each call multiplied by the number of calls.

Cisco IOS Voice, Video, and Fax Configuration Guide