- What is Port ID?
- Why root bridge is used in STP?
- How do you prevent network loops?
- What causes a routing loop?
- What are the three components of an STP bridge ID?
- What is bridge priority in STP?
- What is a Layer 2 loop?
- How do I find my port ID?
- How do you find the root bridge in STP?
- What is root ID in STP?
- What is Port ID in STP?
What is Port ID?
A port number is a way to identify a specific process to which an Internet or other network message is to be forwarded when it arrives at a server.
For the Transmission Control Protocol and the User Datagram Protocol, a port number is a 16-bit integer that is put in the header appended to a message unit..
Why root bridge is used in STP?
Redundant links are used to provide back up path when one link goes down but Redundant link can sometime cause switching loops. The main purpose of Spanning Tree Protocol (STP) is to ensure that you do not create loops when you have redundant paths in your network.
How do you prevent network loops?
How does STP prevent loops? Because the “best ports” are put into forwarding state and the other ports are put into blocking state, there are no loops in the network. When a new switch is introduced to the network, the algorithm and port states are recalculated to prevent a new loop.
What causes a routing loop?
A routing loop is a common problem with various types of networks, particularly computer networks. They are formed when an error occurs in the operation of the routing algorithm, and as a result, in a group of nodes, the path to a particular destination forms a loop.
What are the three components of an STP bridge ID?
The three components that are combined to form a bridge ID are bridge priority, extended system ID, and MAC address.
What is bridge priority in STP?
Every Bridge (Switch) Participating in a Spanning Tree Protocol network is assigned with a numerical value called Bridge Priority (Switch Priority) Value. Bridge Priority (Switch Priority) Value is a 16-bit binary number. By default, all Cisco Switches has a Bridge Priority (Switch Priority) value of 32,768.
What is a Layer 2 loop?
A switching loop or bridge loop occurs in computer networks when there is more than one Layer 2 (OSI model) path between two endpoints (e.g. multiple connections between two network switches or two ports on the same switch connected to each other).
How do I find my port ID?
How to Find Your Port Number?Open Command Prompt by typing “Cmd” in the search box.Enter the “ipconfig” command.Now, type “netstat -a” command for a list of connections and port numbers.
How do you find the root bridge in STP?
Since the BID starts with the Bridge Priority field, essentially, the switch with the lowest Bridge Priority field becomes the Root Bridge. If there is a tie between two switches having the same priority value, then the switch with the lowest MAC address becomes the Root Bridge.
What is root ID in STP?
The Root ID is the Bridge ID of the root bridge – as simple as that. As you know, every bridge and switch has its own unique Bridge ID that consists of three fields: Configurable priority. Instance number, usually the VLAN ID for which the STP runs. MAC address of the switch.
What is Port ID in STP?
In STP, the Port ID has two parts: configurable priority and a fixed port number (which is not the MAC address). On many switches, the port number is exactly the number after the slash, i.e. Fa0/1 is 128.1, Fa0/24 is 128.24.