H3C S3600-28PSI System Description

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

H3C S3600-28PSI System Description Manual pdf 61 page image

System DescriptionH3C S3600 Series Ethernet Switches Chapter 3 Software Features3-2series can implement broadcast suppression not only based on port rate ratio but alsoon pps.For the S3600 series, the broadcast suppression function not only can beenabled/disabled globally in the whole fabric, but also can be enabled/disabled onindividual ports. When the global broadcast suppression ratio is set, the broadcastsuppression ratio on each port is set to the value equal to the global broadcastsuppression ratio.3.1.3 VLANVirtual local area network (VLAN) is a technology that implements virtual workgroupsby assigning devices of the same category (such as PC) on a LAN into networksegments logically rather than physically. IEEE 802.1Q is the standard protocol for theVLAN technology.As devices are divided logically rather than physically, they do not necessarily reside onthe same physical network segment. After the division, the broadcast and unicast trafficis confined inside the VLAN to which it belongs.The VLAN technology helps network flow control, network management, and networksecurity.3.1.4 STP/RSTP/MSTPThe spanning tree protocol (STP)/Rapid spanning tree protocol (RSTP) prunes a loopL2 switching network into a loop-free tree (all data on the L2 switching network musttravel along the spanning tree), thereby avoiding network broadcast storms caused bynetwork loops and providing redundant links for data forwarding.Basically, STP/RSTP is to generate a “tree” whose root is a switch called root bridge.Which switch is to be selected as the root bridge is based on their settings (such asswitch priority and MAC address), but there should be only one root bridge at any time.Setting out from the root, a tree stretches through the switches. A non-root switchforwards data to the root from its root port and to the connected network segment fromits designated port. A root periodically transmits configuration BPDUs, while a non-rootswitch receives and forwards them. If a switch receives configuration BPDUs from twoor more ports, it assumes that there is a loop in the network. To eliminate the loop, theswitch selects one of the ports as the root port and blocks others. When a port receivesno configuration BPDUs for a long time, the switch considers that the configuration ofthis port has timed out and the network topology may have changed. Then itrecalculates the network topology and generates a new tree.RSTP is an STP enhancement that significantly shortens the time for the networktopology to stabilize.