4-158 Motorola RF Switch System Reference Guide
4. Refer to the General Configuration field for the following
MST Config. Name Enter a name for the MST region. This is used when configuring multiple regions
within the network. Each switch running MSTP is configured with a unique MST
region name. This helps when keeping track of MSTP configuration changes.
Increment this number with each configuration change. The revision-level specifies
the revision-level of the current configuration.
MST Revision Level Assign a MST revision level number to the MSTP region to which the device
belongs. Each switch running is configured with a unique MSTP name and revision
number. This helps when keeping track of MSTP configuration changes. Increment
this number with each configuration change. The revision level specifies the
revision level of the current configuration.
Error Disable Timeout Select this option to enable an error disable-timeout facility. The error disable-
timeout is used to set a timeout value for ports disabled resulting from a BPDU
guard.
The BPDU guard feature shuts down the port on receiving a BPDU on a BPDU-guard
enabled port.
ID Format Selector Displays the ID format currently in use.
PortFast Bdpu Filter Select this checkbox to enable BPDU filter for all portFast-enabled ports.The
Spanning Tree Protocol sends BPDUs from all the ports. Enabling the BPDU filter
feature ensures PortFast-enabled ports do not transmit or receive any BPDUs.
PortFast Bdpu Guard Select this checkbox to enable BPDU guard for all p
PortFast-enabled ports.
When the BPDU Guard feature is set for bridge, all p
PortFast-enabled ports of the
bridge that have BPDU set to default shutdown the port on receiving a BPDU. Hence
no BPDUs are processed.
Admin Cisco Mode Select this checkbox to enable interoperability with Cisco’s version of MSTP, which
is incompatible with standard MSTP.
Operator Cisco Mode Displays whether Cisco’s version of MSTP is running. This is not a configurable
parameter.
MST Config Digest Displays the Configuration Digest derived from the MSTP Configuration table.
CIST Root This displays the CIST (Common and Internal Spanning Tree) root bridge’s bridge
identifier. The bridge identifier consists of a priority value followed by the MAC
address.The lower the path cost, the greater the likelihood of the bridge becoming
the root.
External Root Cost Displays the root cost of the CIST root.
Regional Root This displays the regional roots MAC address.
CIST Bridge Priority Set the bridge priority for the common instance. The value entered, determines the
likelihood this bridge is selected as the root.
The lower the priority the greater the likelihood of the bridge becoming a root.
CIST Bridge HelloTime Set the CIST Hello Time (in seconds). After the defined interval all bridges in a
bridged LAN exchange BPDUs.
The hello time is the time interval (in seconds) the device waits between BPDU
transmissions.
A very low value leads to excessive traffic on the network, whereas a higher value
delays the detection of a topology change. This value is used by all instances.
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