H3C S7500 Series Operation Manual
Also see for S7500 Series: Operation manualOperation manualOperation manualOperation manualCommand manual
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Contents
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Operation Manual – MSTPH3C S7500 Series Ethernet Switches Chapter 1 MSTP Configuration1-1Chapter 1 MSTP ConfigurationWhen configuring MSTP, go to these sections for information you are interested in:z MSTP Overviewz Root Bridge Configurationz Leaf Node Configurationz The mCheck Configurationz Guard Function Configurationz Digest Snooping Configurationz Rapid Transition Configurationz VLAN-VPN Tunnel Configurationz Displaying and Debugging MSTPz MSTP Configuration Examplez VLAN-VPN Tunnel Configuration Example1.1 MSTP OverviewSpanning tree protocol (STP) cannot enable Ethernet ports to transit their states rapidly.It costs two times of the forward delay for a port to transit to the forwarding state even ifthe port is on a point-to-point link or the port is an edge port. This slows down thespanning tree convergence of STP.Rapid spanning tree protocol (RSTP) enables the spanning tree to converge rapidly,but it suffers from the same drawback as that of STP: all bridges in a LAN share onespanning tree; packets of all VLANs are forwarded along the same spanning tree, andtherefore redundant links cannot be blocked based on VLANs.As well as the above two protocols, multiple spanning tree protocol (MSTP) candisbranch a loop network to form a tree-topological loop-free network to preventpackets from being duplicated and forwarded endlessly in the loop network. Besidesthis, MSTP can also provide multiple redundant paths for packet forwarding andimplement VLAN-based load balancing.MSTP is compatible with both STP and RSTP. It overcomes the drawbacks of STP andRSTP. It not only enables spanning trees to converge rapidly, but also enables packetsof different VLANs to be forwarded along their respective paths to provide a betterload-balancing mechanism with redundant links.1.1.1 MSTP Protocol Data UnitBridge protocol data unit (BPDU) is the protocol data unit (PDU) that STP and RSTPuse. |
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