Siemens RUGGEDCOM ROX II User Manual page 688

Chapter 14
Network Redundancy
Parameter
hello-time { hello-time }
max-age { max-age }
tx-hold-count { tx-hold-count }
forward-delay { forward-delay }
max-hops { max-hops }
mst-region-name { mst-region-name }
mst-revision-level { mst-revision-level }
4. Configure the eRSTP settings by configuring the following parameter(s):
Parameter
max-net-diameter-multiplier { max-net-
diameter-multiplier }
bpdu-guard { bpdu-guard }
642
The version (either only STP or Rapid STP or Multiple STP) of the Spanning Tree Protocol
(STP) to support.
Synopsis: A 32-bit unsigned integer between 1 and 10
Default: 2
The time between configuration messages issued by the root bridge. Shorter hello times
result in faster detection of topology changes at the expense of moderate increases in
STP traffic. (Relationship : maxAgeTime >= 2 * (helloTime + 1.0 seconds))
Synopsis: A 32-bit unsigned integer between 6 and 40
Default: 20
The time for which a configuration message remains valid after being issued by the
root bridge. Configure this parameter with care when many tiers of bridges exist, or
slow speed links (such as those used in WANs) are part of the network. (Relationship :
maxAgeTime >= 2 * (helloTime + 1.0 seconds))
Synopsis: A 32-bit unsigned integer between 0 and 100
Default: 0
The maximum number of configuration messages on each port that may be sent in
a special event, such as recovering from a failure or bringing up a new link. After the
maximum number of messages is reached, Rapid Spanning Tree Protocol (RSTP) will be
limited to one message per second. Larger values allow the network to recover from
failed links more quickly. If RSTP is being used in a ring architecture, the transmit count
should be larger than the number of switches in the ring. If a number is not defined, the
value is considered unlimited.
Synopsis: A 32-bit unsigned integer between 4 and 30
Default: 15
The amount of time a bridge spends learning MAC addresses on a rising port before
beginning to forward traffic. Lower values allow the port to reach the forwarding state
more quickly, but at the expense of flooding unlearned addresses to all ports.
Synopsis: A 32-bit unsigned integer between 6 and 40
Default: 20
The maximum possible bridge diameter inside a Multiple Spanning Tree (MST)
region. MST BPDUs propagating inside an MST region carry a time-to-live parameter
decremented by every switch that propagates the BPDU. If the maximum number of
hops inside the region exceeds the configured maximum, the BPDUs may be discarded
due to their time-to-live information. This parameter is only applicable to Multiple
Spanning Tree Protocol (MSTP) configurations.
Synopsis: A string 1 to 32 characters long
The name of the MST region. All devices in the same MST region must have the same
region name configured
Synopsis: A 32-bit unsigned integer between 0 and 65535
Default: 0
The revision level for the MST configuration. Typically, all devices in the same MST region
are configured with the same revision level. However, different revision levels can be
used to create sub-regions under the same region name.
Synopsis: { 1, 4 }
Default: 4
The Max Network Diameter as a multiplier of the MaxAgeTime value.
Synopsis: { specify, noshutdown, untilreset }
Default: noshutdown
Description
Description
Configuring STP Globally
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