Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 157 of 669
Spanning Tree
The S4224 Spanning Tree menu provides the STP (Spanning Tree Protocol) configuration sub-menus
from the
Configuration
>
Spanning
Tree
menu path.
Figure 2. Spanning Tree Example
The Spanning Tree Protocol is an OSI layer-2 protocol which ensures a loop-free topology for any
bridged LAN.
STP/RSTP/MSTP
The S4224 supports the spanning tree protocols of STP/RSTP and MSTP on all interfaces. The Spanning
Tree protocols help in creating a loop free bridged network. The implementation conforms to the IEEE
specs 802.1D for STP, 802.1w for RSTP and 802.1s for MSTP.
The S4224 can act in the role of a root bridge or as a designated bridge by the process of election. The
priorities for the bridge instance that is used in BPDU frames can be configured. For MSTP, each MSTI
(Multiple Spanning Tree Instance) priority can be configured for the Common and Internal Spanning Tree
(CIST) instance.
Figure 3. Multiple Spanning Tree Example
The Spanning Tree sub-menus (Bridge Settings, MSTI Mapping, MSTI Priorities, CIST Ports, and MSTI
Ports) are described below.