Contents
How many forward delay does STP have?
The forward delay timer is the time interval that is spent in the listening and learning state. Default Spanning Tree Protocol (STP) forward delay timer is 15 seconds. You can adjust the Spanning Tree Protocol (STP) forward delay timer to any value between 4 and 30 seconds.
What is forward delay timer in STP?
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 STP timers and explain different types of STP timers?
STP Timers :
| Timer | Default Value | Description |
|---|---|---|
| MaxAge | 10*Hello time | Max time a switch must wait if no Hello received before proceeding to do change. |
| Forward Delay | 15 seconds | Time taken by switch to change status of ports from forwarding to blocking and vice-versa. |
What affects propagation delay?
Factors that affect propagation delay are: the way it is measured, the amount of overdrive, the supply voltage, the output driver supply voltage, capacitive loading, the common mode voltage, the configuration (inverting or non-inverting), the edge on which one measures (rising or falling) and temperature.
What is the default timer used by STP?
15 seconds
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.
What are the default timer used by STP?
How do I change STP timers?
To change the Spanning Tree Protocol (STP) forward delay timer to 20 seconds on VLAN 100, run the following command from Global Configuration mode. To change the Spanning Tree Protocol (STP) max age timer to 25 seconds on VLAN 100, run the following command from Global Configuration mode.
How to calculate the end to end delay?
At this stage we are not considering processing, transmission or propagation delay. The end-to-end Delay is N*L/R ( N links in series, using store-and-forward between the links). The author asks to generalize the above formula for sending P packets over N links. The solution I derived is (N*L/R)*P. Is this a reasonable solution? PS.
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.
How to calculate the time of the forward delay?
Therefore, twice the time of the forward delay (listening time + learning time) contains all these parameters. The formula is: 2 x forward delay = end-to-end_BPDU_propagation_delay + Message_age_overestimate + Maximum_frame_lifetime + Maximum_transmission_halt_delay = 14 + 6 + 7.5 + 1 = 28.5 forward_delay = 28.5 /2 = 15 (rounded)
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.