What is Spanning Tree Protocol Cisco?

Spanning Tree Protocol (STP) is a Layer 2 protocol that runs on bridges and switches. The specification for STP is IEEE 802.1D. The main purpose of STP is to ensure that you do not create loops when you have redundant paths in your network.

What is STP and its types?

Types of Spanning Tree Protocols (3.2. STP—Defined in IEEE 802.1D, this is the original standard that provided a loop-free topology in a network with redundant links. Also called Common Spanning Tree (CST), it assumed one spanning-tree instance for the entire bridged network, regardless of the number of VLANs.

How does STP protocol works?

STP uses the Spanning-Tree Algorithm (SPA) to create a topology database of the network. To prevent loops, SPA places some interfaces in forwarding state and other interfaces in blocking state. all switches in a network elect a root switch. All working interfaces on the root switch are placed in forwarding state.

What is STP in CCNA?

Spanning Tree Protocol (STP) is a network protocol designed to prevent layer 2 loops. It is standardized as IEEE 802. D protocol. STP blocks some ports on switches with redundant links to prevent broadcast storms and ensure loop-free topology.

Is Spanning Tree Protocol still used?

Spanning Tree Protocol (STP) is dead, or at least it should be. STP still only has one focal point (root) and can only have one forwarding path toward that one device. Yes, we can use technologies like EtherChannel to help hide portions of the topology for STP, but STP does NOT do multipath forwarding!

What is difference between STP and RSTP?

Unlike STP, which has five switchport states, RSTP has only three: discarding, learning, and forwarding….Comparing STP and RSTP Port States.

Blocking Discarding
Listening Discarding
Learning Learning
Forwarding Forwarding

Why is STP rarely used?

Although STP prevents interference better than UTP, it is more expensive and difficult to install. Because of its cost and difficulty with termination, STP is rarely used in Ethernet networks.

What is full form STP?

STP is a standard reference point of temperature and pressure, used when measuring gases. Oxygen is a colorless, odorless, and tasteless gas at standard temperature and pressure (STP). STP is a standard reference point of temperature and pressure, used when measuring gases.

How do I enable STP?

All switches from Cisco ship with Spanning Tree Protocol (STP) enabled by default, but if STP is misconfigured for any reason, you can easily enable it. To enable spanning tree, connect to your switch and type spanning-tree mode while in Global Configuration mode.

What is a STP frame?

STP uses bridge protocol data units (BPDUs), also known as configuration messages, as its protocol frames. This chapter uses BPDUs to represent all types of spanning tree protocol frames. STP-enabled devices exchange BPDUs to establish a spanning tree.

What are the issues in Spanning Tree Protocol?

Brittle failure mode The Spanning Tree Protocol actually works quite well. But when it doesn’t, the entire failure domain collapses. The way to reduce the failure domain is to use routing, but this causes application problems. This brittle failure mode for the minimum failure condition is the major problem with STP.

What are the five Spanning Tree Protocol states?

The ports on a switch with enabled Spanning Tree Protocol (STP) are in one of the following five port states.

  • • Blocking.
  • • Listening.
  • • Learning.
  • • Forwarding.
  • • Disabled.