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What is the purpose of STP in a switched network?
Introduction. Spanning Tree Protocol (STP) is a Layer 2 protocol that runs on bridges and switches. The specification for STP is IEEE 802.1D. The main purpose of STP is to ensure that you do not create loops when you have redundant paths in your network.
What is meant when we say that all switches in the STP network is converged?
STP Convergence in General Every switch accepts and retains only the best current root bridge information. The switch then blocks alternate paths to the root bridge, leaving only the single optimal (in terms of path cost) uplink and continues relaying the optimal information.
Which switch is selected as a root bridge in STP?
The root bridge is selected by manually configuring its bridge priority to a low value. 32768 is the default value out of a range from 0 to 61440. If all switches in a single spanning tree have the same bridge priority, the switch with the lowest MAC address will become the root bridge.
How many switches does STP have?
17 switches
The STP protocol It is based on a network with a maximum diameter of no more than 17 switches. It uses timers to synchronize any changes in the network topology, and this could take minutes.
What is a full form of ACP?
The full form of ACP is the Assistant Commissioner of Police. In the IPS (Indian Police Service), it is known as one of the top ranks. After the grade of Police Commissioner in the Indian Police Service, the ACP occupies one of the upper ranks.
Which is the root bridge in STP spanning tree?
All the bridges in a LAN have a path to the root. STP allows you to select the root bridge automatically. However, if the STP network admin wants, he or she can change the RB according to the network. A noon-root Bridge is any bridge that is not the root bridge. The root port is a port that leads towards the Root Bridge.
Which is the primary decision making switch in STP?
STP has a root and branches like a tree. The primary decision-making switch in an STP environment is called the root bridge. The network will flow out from the root bridge to form a logical branched network. All switches in a LAN participating in STP branch from the root switch port or bridge.
What happens to the network when STP is enabled?
When STP is enabled every switch in the network starts in the blocking state and transitions to listening and learning states. If properly configured, the ports then stabilize to the forwarding or blocking state until a change in the network is made.
How are multiple root switches used in spanning tree?
Another thing that must be understood is that multiple root switches can exist in the network depending on what STP mode is being used. By default, on Cisco switching equipment, each VLAN has its own STP instance and a root switch is elected for each VLAN; this mode is called Per VLAN Spanning Tree Plus (PVST+).