Rapid Spanning Tree - Interlogix GE-DS-242-PoE User Manual

Chapter 4: Web-Based Management
2. Fill QinQ Tpid.
3. Enable port QinQ function: select QinQ checkbox for special port.
4. Enable port QinQ Uplink function: select QinQ Uplink checkbox for special
port.

Rapid Spanning Tree

The Rapid Spanning Tree Protocol (RSTP) is an evolution of the Spanning Tree
Protocol and provides for faster spanning tree convergence after a topology
change. The system also supports STP and the system will auto-detect the
connected device that is running STP or RSTP protocol.
Theory
The Spanning Tree protocol can be used to detect and disable network loops,
and to provide backup links between switches, bridges or routers. This allows the
switch to interact with other bridging devices in your network to ensure that only
one route exists between any two stations on the network, and provide backup
links which automatically take over when a primary link goes down. The spanning
tree algorithms supported by this switch include these versions:
 STP - Spanning Tree Protocol (IEEE 802.1D)
 RSTP - Rapid Spanning Tree Protocol (IEEE 802.1w)
The IEEE 802.1D Spanning Tree Protocol and IEEE 802.1W Rapid Spanning
Tree Protocol allow for the blocking of links between switches that form loops
within the network. When multiple links between switches are detected, a primary
link is established. Duplicated links are blocked from use and become standby
links. The protocol allows for the duplicate links to be used in the event of a
failure of the primary link. Once the Spanning Tree Protocol is configured and
enabled, primary links are established and duplicated links are blocked
automatically. The reactivation of the blocked links (at the time of a primary link
failure) is also accomplished automatically without operator intervention.
This automatic network reconfiguration provides maximum uptime to network
users. However, the concepts of the Spanning Tree Algorithm and protocol are a
complicated and complex subject and must be fully researched and understood.
It is possible to cause serious degradation of the performance of the network if
the Spanning Tree is incorrectly configured. Please read the following before
making any changes from the default values.
72 GE-DS-242-PoE Managed Ethernet Switch User Manual