H3C S3600-28PSI System Description

Also see for S3600-28FEI: Datasheet Operation manual Operation manual

H3C S3600-28PSI System Description Manual pdf 71 page image

System DescriptionH3C S3600 Series Ethernet Switches Chapter 3 Software Features3-12packets, it assigns bandwidth to each flow according to their precedence, with a smallerprecedence value indicating less bandwidth. If on a port there are eight flows with theprecedence values of 0, 1, 2, 3, 4, 5, 6, and 7 respectively, then the total bandwidth isthe sum of (precedence value + 1)s: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36.The proportion of each flow’s bandwidth is: (flow precedence value + 1)/sum of(precedence value + 1)s. Then, the flows' bandwidth proportion values are respectively:1/36, 2/36, 3/36, 4/36, 5/36, 5/36, 6/36, 7/36, 8/36.Another example: there are four flows, of which three have the precedence of 4 andone has the precedence of 5; then the total bandwidth is (4 + 1) x 3 + (5 + 1) = 21.The bandwidth proportion values of the flows with precedence 4 are 5/21, and that ofthe flow with precedence 5 is 6/21.S3600 series support five scheduling algorithms that can be set based on port andqueue at the same time: Strict Priority (SP), Weighted Round Robin (WRR), WeightedFair Queue (WFQ), SP + WFQ, SP + WRR3.6.9 Traffic ShapingTraffic shaping is to control traffic output rate as such that packets can be output at aneven rate. Normally, traffic shaping is applied on a device to adapt its output rate to theinput rate of its connected downstream device so as to avoid unnecessary packet dropand congestion. It is different from traffic policing in the sense that it buffers the packetsthat exceed the specified rate limit so that packets are sent out at an even speed,whereas traffic policing is to discard the packets. Besides, traffic shaping can result inthe additional delay that can be avoided in traffic policing.3.6.10 Priority TagThe priority tag feature is used for setting new packet priority.The S3600 series provide some specific packets with the priority tag service. The tagsinclude ToS priority, differentiated services codepoint priority (DSCP), and 802.1ppriority.3.6.11 QoS ProfileCooperating with 802.1x authentication, the QoS profile feature dynamically provides aset of pre-defined QoS functions for successfully authenticated users.After an 802.1x user passes the authentication, the switch finds the profile according tothe username-to-profile corresponding relationship configured on the AAA server, and