Team, I have made QOS on the edge router to serve the bandwidth for Voice and set it EF bit. My question is, if incoming packet is already EF bit marked and when it will reach to edge router , then what router will do. Will it remove the ef marking and again put EF marking or it will simply ignore the remarking.
WIll it create any jitter? Here is the configuration
class-map match-any VOICE
match access-group 101 match protocol rtp audio match ip dscp ef
policy-map SW-TRAFFIC class VOICE
priority percent 45 set ip dscp ef
class class-default fair-queue set ip dscp default
Are you receiving the traffic from the Internet or over something that you control like mpls or ipsec tunnel? If it's the internet, you probably won't receive dscp46 from anything on the outside because ISPs will strip it before it gets to you.
Let's say that it's MPLS. If you control both ends, and you're marking both ends outbound, you would need to have an agreement with the ISP (if you're using them as the carrier for your mpls cloud) to support that tag or they will mark it to default.
If you have an agreement and they can guarantee the marking through their network, your router will receive it marked and you can do whatever you want to it with an inbound service policy.
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Routers, usually by default, just pass along a packet's ToS and also usually just ignore it.
If a router has been configured to change and/or "use" ToS, it may or may not significantly impact forwarding of the packet, including jitter.
With your posted configuration, matching for rtp audio and/or DSCP EF will add a little processing overhead. Additionally, setting ToS in your two classes will add a little processing overhead. Both of these should be minimal. However, the configured policy might have a huge impact. For example, once your VOICE class exceeds 45% utilization, voice packets might be dropped (to keep VOICE from exceeding 45% bandwidth utilization).
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