What are STP port roles?

What are STP port roles?

A port’s role determines how it participates in the spanning tree. The five port roles used in RSTP are: Root port—The port closest to the root bridge (has the lowest path cost from a bridge). This is the only port that receives frames from and forwards frames to the root bridge.

What timers does STP convergence require?

The most important timing parameters in STP calculation are forward delay, hello time, and max age. Forward delay is the delay time for port state transition. By default, the forward delay is 15 seconds. A path failure can cause spanning tree re-calculation to adapt the spanning tree structure to the change.

What are the two different STP bridge types?

There are two types of BPDUs in the original STP specification (the Rapid Spanning Tree (RSTP) extension uses a specific RSTP BPDU): Configuration BPDU (CBPDU), used for spanning tree computation. Topology Change Notification (TCN) BPDU, used to announce changes in the network topology.

What two components make up a bridge ID?

Identifying Root Ports The BPDU, which every switch sends, contains information about the switch and its Bridge ID that uniquely identifies the switch on the network. The Bridge ID is made of two components: a configurable Bridge Priority value (which is 32,768 by default) and the switch MAC address.

How does STP block ports?

STP Port States Blocking – When a device is connected, the port will first enter the blocking state. Listening -The switch will listen for and send BPDUs. Learning – The switch will receive a superior BPDU, will stop sending its own BPDUs, and will relay the superior BPDUs. Forwarding – The port is forwarding traffic.

What happens during STP convergence?

Spanning Tree Protocol (STP) convergence (Layer 2 convergence) happens when bridges and switches have transitioned to either the forwarding or blocking state. When layer 2 is converged, Root Switch is elected and Root Ports, Designated Ports and Non-Designated ports in all switches are selected.

What’s the maximum number of bridges in a STP timer?

diameter of the STP domain (dia)—This value is the maximum number of bridges between any two points of attachment of end stations. The IEEE recommendation is to consider a maximum diameter of seven bridges for the default STP timers.

What are the three components of an STP bridge ID choose three?

What are the three components of an STP bridge ID choose three? The three components that are combined to form a bridge ID are bridge priority, extended system ID, and MAC address. Regarding this, what is STP bridge ID?

How long is the forward delay in spanning tree?

This time is equal to 2 seconds (sec) by default, but you can tune the time to be between 1 and 10 sec. forward delay —The forward delay is the time that is spent in the listening and learning state. This time is equal to 15 sec by default, but you can tune the time to be between 4 and 30 sec.

What are the parameters of the Spanning Tree Protocol?

IEEE 802.1D defines STP. In addition to the timers that the Spanning Tree Protocol Timers section describes, IEEE also defines these parameters that relate to STP: diameter of the STP domain (dia) —This value is the maximum number of bridges between any two points of attachment of end stations.