Extreme Networks Summit WM3000 Series Reference Manual page 220

Network Setup
MST Config. Name
MST Revision Level
Error Disable
Timeout
ID Format Selector
Portfast Bdpu Filter
PortFast Bdpu Guard
Admin Cisco Mode
Operator Cisco Mode Select this checkbox to enable interoperability with Cisco's Operator
MST Config Digest
4 Refer to the General Configuration field for the following
CIST Root
External Root Cost
Regional Root
CIST Bridge Priority
CIST Bridge
HelloTime
Bridge Hello Time
220
Enter a name for the MST region. This is used when configuring multiple
regions within the network. Each controller 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.
Assign a MST revision level number to the MSTP region to which the
device belongs. Each controller 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.
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.
Displays the ID format currently in use.
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.
Select this checkbox to enable BPDU guard for all portfast enabled ports.
When the BPDU Guard feature is set for bridge, all portfast-enabled ports
of the bridge that have BPDU set to default shutdown the port on
receiving a BPDU. Hence no BPDUs are processed.
Select this checkbox to enable interoperability with Cisco's Admin version
of MSTP, which is incompatible with standard MSTP.
version of MSTP, which is incompatible with standard MSTP.
Displays the Configuration Digest derived from the MSTP Configuration
table.
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.
Displays the root cost of the CIST root.
This displays the regional roots MAC address.
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.
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.
Displays the configured Hello Time. If this is the root bridge, the value is
equal to the configured Hello Time.
Summit WM3000 Series Controller System Reference Guide