simplymdf.blogg.se - Amway stp pdf

Run the stp root primary command on a device to configure the device as the root bridge.(Optional) Configure the root bridge and secondary root bridge.Run the stp mode stp command to set the working mode of the device to STP.īy default, the working mode of a device is MSTP.Run the system-view command to enter the system view.Then, the port only receives BPDUs, and does not forward data or send BPDUs. If the port's own configuration BPDU is superior, the configuration BPDU on the port is not updated and the port is blocked. If the calculated configuration BPDU is superior, the port is selected as the designated port and periodically sends the calculated configuration BPDU. Then the device compares the calculated configuration BPDU with the configuration BPDU received on the port. The device generates a configuration BPDU for each port based on the configuration BPDU on the root port and path cost of the root port.The root port is in the Forwarding state. A non-bridge device selects the port that receives the optimal configuration BPDU as the root port.All the ports on the root bridge are in Forwarding state. Then devices exchange configuration BPDUs and compare their root IDs to find the device with the smallest BID, which becomes the root bridge.

S1 sends configuration BPDUs to S2 through AP1, so S1 is the designated bridge for S2, and AP1 is the designated port on S1.ĭuring network initialization, every device considers itself the root bridge and sets the root ID to its own BID.

Designated port: The designated port is located on a designated bridge and forwards configuration BPDUs to the device or LAN, as illustrated in Figure 1.ĪP1 and AP2 are ports of S1 BP1 and BP2 are ports of S2 CP1 and CP2 are ports of S3.

An STP device has only one root port, and there is no root port on the root bridge. Among all STP-capable ports on a device, the port with the smallest root path cost is a root port.

Root port: The root port on an STP device has the smallest path cost to the root bridge and is responsible for forwarding data to the root bridge.

Otherwise, new access devices may trigger STP root bridge switching, causing short service interruptions. Configure an optimal core switch as the root bridge to ensure stability of the STP Layer 2 network. It is recommended that you manually configure the root bridge and secondary root bridge. When the network topology changes, the root bridge will be re-elected accordingly. Typically, the root bridge should have high performance and be located at a higher layer of the network. The root bridge is the logical center, but not necessarily the physical center, of the network.

Root bridge: There is only one root bridge on the entire STP network.

Three elements are involved in trimming a ring network into a tree network: root bridge, root port, and designated port. Root Bridge, Root Port, and Designated Port