What is the forward delay in STP?

Question

Little knowledge in this field any help would be appreciated. 

 

1.What are the port states in an STP implementation?
2.How does STP calculate its cost?
3.How long does it take to transition from blocking to forwarding?
4.What are the different types of STP available?

Answer 1

1- The five states of an STP port are:
-The disabled port state
-The blocking port state
-The listening port state
-The learning port state
-the forwarding port state.

 

2- The STP port cost basics are:
- for 1,000Mbs operating port the cost is 4 and for 100Mbps port the cost is 19.
- If a 1,000Mbps port is directly connected to a 100Mbps port between two switches, they will both be at the 100Mbps speed.

 

3- To transition from blocking to forwarding port takes 50 seconds delay

 

4- The known types of STP are:
- PVST+
- RSTP
- Rapid-PVST+
- MSTP