Test Scenario:
- We have 5 Mbps point-to-point Metro Ethernet connection to an ISP
- All voip and video traffic should be prioritized to prevent delay and jitter
- ISP classifies our voice/video traffic according to dscp value of ef and they prioritized this traffic in their IP/MPLS backbone
- Lets make the configuration on branch site:
Firstly, voip-video traffic should be classified and marked:
In our example, Voip and Video packets are classified by their IP addresses(they can also be marked by lots of matching criteria)
ip access-list extended voip-video-acl
permit ip 10.10.11.0 0.0.0.255 any
class-map match-any voip-video-marking
match access-group voip-video-acl
policy-map Qos-Marking
class voip-video-marking
set ip dscp ef
Packets are marked when entering the router from the LAN side:
interface G0/0
service-policy input Qos-Marking
Then these packets will be prioritized:
class-map match-any voip-video
match dscp ef
policy-map QOS-child
class voip-video
priority percent 50
class class-default
fair-queue
random-detect dscp-based
Traffic shaping should be enabled according the CIR value in Ethernet WAN connections.In our case this value is 5Mbps.We are doing prioritizing in shaping queues:
policy-map QOS-parent
class class-default
shape average 5000000
service-policy QOS-child
Then we attached this policy-map to our WAN interface.
service-policy output Qos-parent
Note: Similar QOS configurations should be done at remote side.
