Cisco Video Over IP QoS 配置

在做 Video over IP 时候一定要确保双方的 viewstation 以太网口带宽和双工都是一致的，否者会出现有一个方向的视频质量非凡差的问题。

这里有个很好的 Video QoS 例子，用的是 2M 的专线，需要在 viewstation 上作优先级设置的，不然 QoS 策略无法被激活的！关于 polycom viewstation 的 QoS precedence 设置请您参考 Polycom Viewstation 的设置。

This is one I did a couple of weeks ago (below)- only acl 100 was getting hit. It did do the trick and the picture was clear. the priority value is actually the bandwidth in Kilobits. You will need to be able to set the precedence on the video traffic to critical - this was done on the viewstations that were sending out the video packets in this case..

class-map match-all video-control

match Access-group 101

class-map match-all video

match access-group 100

!

!

policy-map QoS-Policy

class video

priority 800 553058304

class video-control

bandwidth 8

class class-default

fair-queue

!

!

!

!

!

interface Multilink1

ip address 172.22.254.2 255.255.255.0

ip tcp header-compression iphc-format

no ip mroute-cache

load-interval 30

service-policy output QoS-Policy

ppp multilink

ppp multilink fragment-delay 10

ppp multilink interleave

multilink-group 1

ip rtp header-compression iphc-format

!

interface Serial0/0

bandwidth 2048

no ip address

encapsulation ppp

no ip mroute-cache

load-interval 30

no fair-queue

serial restart_delay 0

ppp multilink

multilink-group 1

!

access-list 100 permit ip any any precedence critical

access-list 101 permit ip any any precedence flash

access-list 101 permit ip any any dscp af31