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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. Table 14-2 BPDU priority vector. Upon receipt of a configuration BPDU, a device on an STP network compares the fields listed in Table 14-2 with its own values.
Consider the following example: SW1 has the lowest BID and has been selected as the root bridge or switch. SW2 and SW3 have then determined their own root port based on the lowest port cost. On the shared network segment between SW2 and SW3, a spanning tree designated port needs to be selected.
7 Δεκ 2010 · A bridge device has two (or more) ports. The one that is connected on the side where the STP root resides is called 'root port'. A port not facing the root but forwarding traffic (while lowest cost) from another segment is called 'designated port'.
25 Φεβ 2022 · The port selected by the STP is named the root port, which sends data to the root bridge. The root bridge receives all the data from different bridges. The cost of the port, port priority, and switch ID determines the path for the destination.
3 Μαρ 2019 · In short and simplified, a designated port is a forwarding port that leads away from the root bridge (from the priority perspective). The other end of a designated port is a root port (assuming P2P). The root port is the best port leading towards the root bridge. A root port on one bridge needs to be designated at the other end bridge for the ...
1 Δεκ 2017 · Designated port—A designated port is a non-root port that is permitted to forward traffic. Designated ports are selected on a per-segment basis, based on the cost of each port on either side of the segment and the total cost calculated by STP for that port to get back to the root bridge.
16 Οκτ 2012 · This article will take a look at the STP path selection process, how a root switch is elected, how root and designated ports are assigned, and how each switch port is determined to be a...
