What are the Spanning Tree port states?
There are five Spanning Tree Port States :
- Blocking State : Switch port enters the blocking state at time of election process, when a switch receives a BPDU on a port that indicates a better path to the Root Switch or if a port is not a Root Port.
- Listening State :
- Learning State :
- Forwarding State :
- Disabled State :
What are the different types of spanning tree protocol?
Table 3-4 Comparing Spanning Tree Protocols
| Protocol | Standard | Resources Needed |
|---|---|---|
| STP | IEEE 802.1D | Low |
| PVST+ | Cisco | High |
| RSTP | IEEE 802.1w | Medium |
| Rapid PVST+ | Cisco | High |
Which two states of STP are the primary states for ports?
An interface can only be in two states, Forwarding state or Blocking state. STP employs its algorithm and puts certain interfaces in a Forwarding state.
What are the different port states and timers and Bpdu?
STP Timers
- hello—The hello time is the time interval before a port sends another BPDUs.
- forward delay—The forward delay is the time that is spent in the listening and learning state.
- max age—The max age timer controls the maximum length of time that passes before a bridge port saves its configuration BPDU information.
What are the different port states and their function?
Spanning Tree Port States, Blocking, Listening, Learning, Forwarding, Disabled. The ports on a switch with enabled Spanning Tree Protocol (STP) are in one of the following five port states.
What is designated port in STP?
Designated port—A designated port is a non-root port that is permitted to forward traffic. Designated ports are selected on a per-segment basis, based on the cost of each port on either side of the segment and the total cost calculated by STP for that port to get back to the root bridge.
How many types of BPDU are there?
two kinds
There are two kinds of BPDUs for 802.1D Spanning Tree: Configuration BPDU, sent by root bridges to provide information to all switches. TCN (Topology Change Notification), sent by bridges towards the root bridge to notify changes in the topology, such as port up or port down.
What is Cisco spanning tree?
The Spanning Tree Protocol (STP) is defined by IEEE standard 802.1D-1988. The topology is named Spanning Tree, because it is constructed as a loop-free active forwarding topology, meaning that it is a tree-type topology that spans the entire network.
What is Spanning Tree 802 1w?
Enables the spanning-tree 802.1w port commands on Ethernet ports.
When to use spanning tree portfast?
When to use spanning-tree portfast trunk. Usually spanning-tree portfast is used on access port to which a computer is connected , in order to avoid the 50 Seconds of STP. However I saw examples where they use it on a Trunk Port.
Is spanning tree Cisco priority?
Every Bridge (Switch) Participating in a Spanning Tree Protocol network is assigned with a numerical value called Bridge Priority (Switch Priority) Value. By default, all Cisco Switches has a Bridge Priority (Switch Priority) value of 32,768.
What is designated port in spanning tree protocol?
Root port: The root port is a port that has the lowest cost path to the root bridge.
What does spanning tree protocol (STP) do?
Spanning Tree Protocol (STP) Overview Overview. Spanning tree protocol (STP) (IEEE 802.1D) is predominantly used to prevent layer 2 loops and broadcast storms and is also used for network redundancy. STP. Rapid Spanning Tree Protocol (RSTP) Rapid spanning tree protocol (RSTP) is as its name suggests, a faster transition to a port-forwarding state. RSTP with Meraki Switches.