Routing and WAN connections
BAT54-Rail/F..
Release
7.54
06/08
11.17
The rapid spanning tree protocol
459
Note: RSTP is compatible with STP. Network components which only sup-
port classical STP continue to be supported where RSTP is operational.
D Default: Classic
D Path Cost Computation
D Classic: Uses the classical STP method to compute path costs.
D Rapid: Uses the RSTP method to compute path costs.
D Default: Classic
D 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 Pro-
tocol.
D Values: 0 to 65535, where a higher value means a lower priority.
D Default: 32.768
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.
D Maximum Age
This value defines the time (in seconds) after which a bridge drops mes-
sages received through Spanning Tree as 'outdated'. This parameter
defines how quickly the Spanning Tree algorithm reacts to changes, for
example due to failed bridges.
D Values: 0 to 65535.
D Default: 20
D 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.
D Default: 2
D Forward-Delay
This time (in seconds) determines how much time must pass at a mini-
mum before a Spanning Tree port can change the status (listening, learn-
ing, forwarding).
D Default: 6
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.
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