![]() If it fails, then you are going to have some “fun” in trying to understand the conversation. However, Audio is by far the most important and relies heavily on data packet reaching the destination. This collectively means Audio, Video and Media. Taking Skype for Business in to consideration specifically, we need to classify UDP data streams with sufficient priority to guarantee delivery. Using the AF sub classifications we can sufficiently separate video from file data and prioritise the video stream above the file data. For instance, a network packet containing a video stream is considered to be less important than audio, but more important than a packet containing file data. Assured Forwarding has a few sub classifications that can be used to classify packet priority within its own classification. These classifications are grouped by Assured Forwarding (AF). Now in between the two extremes of 0 (unclassified) and 46 (Expedited) there are other intermediate classifications that are used for important traffic but not considered absolutely critical. This is like hand delivering your Christmas card to your 90 year old Grandma. Network switches determine any traffic entering the EF queue to be so important that they will temporarily suspend all best effort traffic in order to deliver the packet to the next hop and eventually the destination before resuming normal transmission. This is called Expedited Forwarding or EF. ![]() Think of this as the cheapest form of postal service possible that you would use to send a Christmas card to your distant cousin you see once a decade.Īt the other end of the scale, traffic marked with a DSCP value 46 are considered to be extremely important and must be delivered on time and guaranteed to reach the destination. This means that the network switches will try their best to deliver the packet but cannot guarantee it because of congestion, packet loss or other network impairments. For instance, traffic passing through the network that is marked with a DSCP value of 0 are delivered to the destination with best effort. Whilst the packet is in transit, switches and routers can read these values and determine how best to transport and deliver the packet to the destination. The DSCP marking is encapsulated into the network packet and transmitted over the LAN. How DSCP works at very high level is simply by marking each packet of data identified by source and/or destination port (usually) with a value. These groupings are then used to prioritise packet transmission across the LAN. Skype for Business uses Differentiated Services Code Point or DSCP for short as the method of classifying types of traffic into priority groupings. Out of the box Skype for Business does not use any Quality of Service (QoS) methodologies. When installing Skype for Business it is important to consider how you are going to guarantee a level of consistent service to your consumers.
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