Siemens RUGGEDCOM ROX II User Manual page 566

Chapter 5
Setup and Configuration
Parameter
bpdu-timeout { bpdu-timeout }
fast-root-failover { fast-root-failover }
dot1w-interop
cost-style { cost-style }
5. Configure the RSTP instance settings by configuring the following parameter(s):
Parameter
bridge-priority { bridge-priority }
6. If necessary, add Multiple Spanning Tree Instances (MSTI). For more information, refer to
"Adding a Multiple Spanning Tree
528
Description
Default: noshutdown
The Rapid Spanning Tree Protocol (RSTP) standard does not
address network security. RSTP must process every received
Bridge Protocol Data Unit (BPDU) and take an appropriate action.
This opens a way for an attacker to influence RSTP topology
by injecting RSTP BPDUs into the network. BPDU Guard is
a feature that protects the network from BPDUs received by
a port where RSTP-capable devices are not expected to be
attached. If a BPDU is received by a port for which the 'Edge'
parameter is set to 'TRUE' or RSTP is disabled, the port will
be shut down for the time period specified by this parameter.
<itemizedlist><listitem>NO SHUTDOWN: BPDU Guard is
disabled.</listitem> <listitem>UNTIL RESET: The port will remain
shut down until the port reset command is issued by the user.</
listitem> <listitem>SPECIFY: A timeout period is specified for the
port using the BPDU Timeout parameter.</listitem></itemizedlist>
Synopsis: An integer between 1 and 86400
The time for which a port is shutdown. Only applicable when
BPDU Guard Mode is set to <emphasis>specify</emphasis>.
Synopsis: { on, off, on-with-standard-root }
Default: on
The Fast Root Failover algorithm. Options include:
<itemizedlist><listitem>Off: The Fast Root Failover algorithm is
disabled. As such, a root switch failure may result in excessive
connectivity recovery time in a mesh network.</listitem>
<listitem>On: Fast Root Failover is enabled and the most robust
algorithm is used, which restores network connectivity quickly
in case of root bridge failure in a mesh network.</listitem>
<listitem>On with standard root: Fast Root Failover is enabled but
a relaxed algorithm is used, allowing the use of a standard switch
in the root role.</listitem></itemizedlist>
Synopsis: true or false
Default: true
Enables/disables IEEE 802.1w Interoperability
Synopsis: { stp, rstp }
Default: stp
The style of link costs to employ. STP uses 16-bit path costs
based upon 1x10E9/link speed (4 for 1Gbps, 19 for 100 Mbps
and 100 for 10 Mbps) whereas RSTP uses 32-bit costs based
upon 2x10E13/link speed (20,000 for 1Gbps, 200,000 for 100
Mbps and 2,000,000 for 10 Mbps). Note that RSTP link costs are
used only when the bridge version support is set to allow RSTP
and the port does not migrate to the Spanning Tree Protocol
(STP).
Description
Synopsis: { 4096, 8192, 12288, 16384, 20480, 24576, 28672,
32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440 }
Default: 32768
The priority assigned to the RSTP/Common Bridge Instance.
Instance".
RUGGEDCOM ROX II
CLI User Guide
Section 5.36.6.3,
Configuring STP Globally