STP BPDU Types
In conventional IEEE 802.1D STP, there are two types of Bridge Protocol Data Units (BPDUs):
- 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.
Both of these play a vital role in the STP topology change process which takes place in the event that an STP topology changes, such as when a port goes up down.
Links:
https://networklessons.com/spanning-tree/spanning-tree-topology-change-notification-tcn/
Links to this page:
- MST - Root port selection for switches outside MST topology
- STP - Aging time reduction with a TCN
- STP - Aging time return to default
- STP - BPDU Filter Use Cases
- STP - BPDU generation and port roles
- STP - BPDUGuard, BPDUFilter, and Portfast
- STP - BPDUs on a switch where STP is disabled
- STP - BPDUs, VLAN IDs, and PVST+
- STP - Cost of last link added by receiving switch
- STP - Dispute
- STP - MST and PVST+ selecting root port
- STP - MST viewed as a single switch by PVST+
- STP - Max Age vs Message Age
- STP - RSTP proposal-agreement process
- STP - RSTP while timer
- STP - Root Link Query (RLQ) BPDU
- STP - Topology Change Acknowledgement (TCA)
- STP - UplinkFast
- STP - determining the blocked port using port ID
- STP - port roles
- STP - port states
- STP BPDU destination MAC address
- STP Max Age
- STP Message Age
- STP Portfast Options
- STP Root Bridge selection
- STP Topology Change (TC) flag
- STP Topology Change Timer
- STP contents of a BPDU
- STP direct vs indirect link failure
- STP how a switch identifies a BPDU
- STP topology change process