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XG v18 QoS - difference Traffic Shaping and DSCP?

There seem to be two places to configure QoS - DSCP as part of SD-WAN policies and the Priority setting under Traffic Shaping.

Does anyone know how they differ and how they interact?

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0 rfcat_vk over 5 years ago

There are also a number of settings your firewall rule.

DSCP sets the packet priority in the overall traffic and assumes the ISP system respects the priority setting where as traffic shaping is the amount of bandwidth you have assigned to an application of network eg my VoIP system has a DSCP of 10 and a traffic shaping of 16-64.

Ian
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0 Arie over 5 years ago in reply to rfcat_vk

OK - thanks for the information.

Would it be fair to say that DSCP is a request for the ISP (e.g. the XG admin has no control over it and can only hope the ISP honors it) and Traffic Shaping is handled by XG itself?
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0 rfcat_vk over 5 years ago in reply to Arie

Hi,

your summary is correct.

Ian
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0 Arie over 5 years ago in reply to rfcat_vk

rfcat_vk said:

Hi,

your summary is correct.

Ian

OK - thanks for the confirmation.

It does, however, beg the question why XG doesn't provide the option to use DSCP internally. I suppose there could be some scenarios where you'd want to be able to prioritize traffic differently internally (although I can't imagine any at the moment), but being able to use DSCP internally would seem to be useful rather than being forced to use TS and DSCP in conjunction with each other.

Correct me if I'm wrong, but doesn't Cisco support DSCP on the LAN?
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0 rfcat_vk over 5 years ago in reply to Arie

Hi Arie,

I can see a scenario internal VoIP traffic, video conferencing.

Ian
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0 Arie over 5 years ago in reply to rfcat_vk

rfcat_vk

Sure, but why not use DSCP internally for that kind of traffic? In combination with throttling, if desired.

I just don't see the need for two different QoS flag methods.
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