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Spanning Tree Modes: MSTP, PVST+, and RPVST+. This article describes the process how switches select the Spanning Tree Protocol (STP) designated port (DP).
On an STP network, the root bridge, root port, and designated port are selected based on the BPDU priority vector {root ID, root path cost, sender BID, PID}, as described in Table 14-2.
This calculation results in SW3's Fa0/2 becoming its root port. Determining the Designated Port. Once the root ports have been determined, the next step is figuring out which ports will become designated. A designated port connects a switch or switches to a non-root segment (from its perspective).
1 Δεκ 2017 · STP determines whether S2’s F0/2 port or S3’s F0/2 port is the designated port for the shared segment. The switch with the lower-cost path to the root bridge (root path cost) has its port selected as the designated port.
25 Φεβ 2022 · We need to select one port with the lowest cost as the designated port and another port as the non-designated port. Or Select the designated port in the switch based on the bridge ID: If the lowest cost on two switches is the same, it selects the designated port based on the Bridge ID.
7 Δεκ 2010 · Once the switches have agreed on the root bridge and their RPs they now need to find their designated ports. The designated ports are the ports responsible for forwarding traffic onto a network segment. Think of it like this - RPs lead toward the root bridge. DPs lead away from the root bridge
Spanning Tree Protocol Explained. We will explore the spanning-tree protocol here, step by step. How do our switches determine which port has to be blocked? First thing we have to do is elect a root bridge. It’s even okay to call it a root switch, but the terminology comes from the 1980s when we didn’t have switches.
