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TalkTalk and DSCP and 19 second latency: Difference between revisions
TalkTalk and DSCP and 19 second latency (view source)
Revision as of 20:21, 7 December 2021
, 7 December 2021→What's DSCP and CS6?
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DSCP (Differentiated Services Code Point ) is a field in the header of IP packets. usually left empty, but a value can be added which will classify how the packets could be handled by network equipment that support QoS (Quality of Service). eg, important packets can be classified has high priority with the hope that they will be able to jump any queues on network routers and get to the destination as fast as possible.
CS6 is one of these classification, and CS6 is described as 'Network control' and is one of the highest classifications available. It us usually meant for packets that contain important router information - such as BGP etc. Packets that an ISP really don't want to drop, and really want to get to the destination as quick as possible.
RFC791 describes the Network Control flag as having:
In our case, the Aruba is trying to give real-time traffic the highest priority possible.▼
* Low Delay
* High Throughput
* High Reliability
It seems that we're seeing two out of three of these being applied in our case!
'''Note:''' The classification below CS6 is described as Telephony - which may have been more appropriate, and in our tests, this traffic is unaffected by TalkTalk's network.
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