- Spanning tree operating
When Spanning Tree is turned off, a LANCOM does not send any Spanning
Tree packets and passes received packets along instead of processing
them itself.
- Protocol version
- Classic: Uses the classical STP to determine network topology.
- Rapid: Uses the RSTP method to determine network topology.
Note: RSTP is compatible with STP. Network components which only support classical
STP continue to be supported where RSTP is operational.
- Path Cost Computation
- Classic: Uses the classical STP method to compute path costs.
- Rapid: Uses the RSTP method to compute path costs.
- Bridge priority
Defines the priority of the bridge in the LAN. This can influence which
bridge should preferably be made root bridge by the Spanning Tree Protocol.
Note: So as to maintain compatibility with RSTP, this value should only
be adjusted in steps of 4096 owing to the fact that RSTP uses the lower
12-bits of this 16-bit value for other purposes.
- Maximum Age
This value defines the time (in seconds) after which a bridge drops
messages received through Spanning Tree as 'outdated'. This parameter
defines how quickly the Spanning Tree algorithm reacts to changes, for
example due to failed bridges.
- Hello Time
This parameter defines (in seconds) in which intervals a device selected
to be the root bridge sends Spanning Tree information into the LAN.
- Forward-Delay
This time (in seconds) determines how much time must pass at a minimum
before a Spanning Tree port can change the status (listening, learning,
forwarding).
Note: When using RSTP the forwarding delay often has no effect because
RSTP has suitable mechanisms of its own to prompt a rapid switching into
the forwarding state.
Note: Modifying any of these three time values is only recommended for
those with exact knowledge of the Spanning Tree protocol.
- Transmit-Hold-Count
Number of BPDUs which can be transmitted by RSTP before a one second
pause commences.
Note: When using classical STP the transmit-hold count has no effect.