Spanning Tree Protocol (STP)
Spanning Tree Protocol (STP) is a Layer 2 protocol that is used
It builds a logical loop free Layer 2 topology on a Layer 2 network that may have physical loops in its design. This is done by creating a tree structure, with a single switch as a root by strategically blocking specific ports on particular switches.
There are various versions of STP which include:
- IEEE 802.1D the original STP standard
- IEEE 802.1w Rapid Spanning Tree Protocol (RSTP)
- IEEE 802.1s Multiple Spanning Tree Protocol (MST)
- Per-VLAN Spanning Tree (PVST), a Cisco proprietary protocol used only for ISL VLAN encapsulation
- Per-VLAN Spanning Tree Plus (PVST+), an improvement on the protocol supporting 802.1Q VLAN encapsulation.
- Rapid Per-VLAN Spanning Tree Plus (Rapid PVST+), is a Cisco enhancement of RSTP. It provides a separate instance of RSTP 802.1w for each VLAN.
Links:
https://networklessons.com/spanning-tree/introduction-to-spanning-tree
https://networklessons.com/spanning-tree/per-vlan-spanning-tree-pvst
https://networklessons.com/spanning-tree/rapid-spanning-tree-rstp
https://networklessons.com/spanning-tree/multiple-spanning-tree-mst
https://www.ciscopress.com/articles/article.asp?p=2832407&seqNum=5
Links to this page:
- home
- EtherChannel - applying configurations to the interface
- EtherChannel - prerequisites for bundling
- Interface - show interfaces counters explained
- Loops in layers 2 and 3
- MAC address flapping
- MST configuration revision number
- Multicast MAC addresses
- Network - control plane
- Network Design - Spine and leaf architecture
- Networks - Overlay Transport Virtualization (OTV)
- QoS - auto qos trust
- Rapid Spanning Tree port states
- SPAN capturing control packets
- STP - Aging time reduction with a TCN
- STP - BPDU generation and port roles
- STP - BPDUGuard, BPDUFilter, and Portfast
- STP - BPDUs on a switch where STP is disabled
- STP - Disabling spanning-tree
- STP - Dispute
- STP - Learning State
- STP - MST and PVST+ selecting root port
- STP - MST maps groups of VLANs
- STP - MST region attributes
- STP - MST viewed as a single switch by PVST+
- STP - Multiple Spanning Tree (MST)
- STP - PVST+ and Rapid PVST+ interaction
- STP - Per VLAN Spanning Tree plus (PVST+)
- STP - RSTP EdgePort
- STP - RSTP convergence process
- STP - RSTP port roles
- STP - RSTP proposal-agreement process
- STP - RSTP while timer
- STP - Shortest Path Bridging (SPB)
- STP - Topology Change Acknowledgement (TCA)
- STP - bridge priority
- STP - determining the blocked port using port ID
- STP - port identification
- STP - port roles
- STP - port states
- STP - what bridge ID does the MST region use
- STP - what is a topology change
- STP BPDU Filter
- STP BPDU Guard
- STP BPDU Types
- STP BPDU destination MAC address
- STP Cost Calculation Methods
- STP Loop Guard
- STP Max Age
- STP Message Age
- STP PortFast
- STP Portfast Options
- STP Root Bridge selection
- STP Root Guard
- STP Topology Change (TC) flag
- STP Topology Change Timer
- STP UDLD
- STP changing link cost
- STP configuring on EtherChannel
- STP contents of a BPDU
- STP cost long mode
- STP cost short mode
- STP determining blocked port using cost
- STP direct vs indirect link failure
- STP fine tuning the spanning tree protocol
- STP how a switch identifies a BPDU
- STP how to find the root bridge
- STP interface type
- STP prio nbr value
- STP topology change process
- Security - MAC Authentication Bypass
- Security - broadcast-multicast storm
- Switching - switchport autostate command
- Troubleshooting a slow network
- VLAN control frames