Help for Spanning Tree
Help for Spanning Tree Switch Configuration/Status
Configurable Data
- Spanning Tree Mode - Specifies whether spanning tree operation is
enabled on the switch. Value is enabled or disabled
- Force Protocol Version - Specifies the Force Protocol Version
parameter for the switch. The options are IEEE 802.1d, IEEE 802.1w
and IEEE 802.1s
- Configuration Name- Identifier used to identify the configuration
currently being used. It may be upto 32 alphanumeric characters
- Configuration Revision Level - Identifier used to identify the
configuration currently being used. The values allowed are between
0 and 65535. The default value is 0.
Non-Configurable Data
- Configuration digest key - Identifier used to identify the
configuration currently being used.
- MST Table - Table consisting of the MST instances (including the CST)
and the corresponding VLAN IDs associated with each of them.
- VID Table - Table consisting of the VLAN IDs
and the corresponding FID associated with each of them.
- FID Table - Table consisting of the FIDs
and the corresponding VLAN IDs associated with each of them.
Command Buttons
- Submit - Applies the new configuration and causes the
changes to take effect.
These changes will not be retained across a power cycle
unless a save configuration is performed.
- Refresh - Refreshes the screen with most recent data.
Help for Spanning Tree CST Configuration/Status
Configurable Data
- Bridge Priority - Specifies the bridge priority for the
Common and Internal Spanning tree (CST). The value lies between
0 and 61440. It is set in multiples of 4096.
For example if
the priority is attempted to be set to any value between 0 and 4095,
it will be set to 0. If it is tried to be set to any value between 4096 and
(2*4096-1) it will be set to 4096 and so on.
The default priority is 32768.
- Bridge Max Age - Specifies the bridge max age for the
Common and Internal Spanning tree (CST). The value lies between
6 and 40, with the value being less than or equal to
"(2 * Bridge Forward Delay ) - 1" and greater than or equal to "2 * ( Bridge Hello Time +1)".
The default value is 20.
- Bridge Hello Time - Specifies the bridge hello time for the
Common and Internal Spanning tree (CST), with the value being less
than or equal to "(Bridge Max Age / 2) - 1". The default hello time
value is 2.
- Bridge Forward Delay- Specifies the time spent in "Listening and Learning" mode before forwarding
packets. Bridge Forward Delay must be greater or equal to "(Bridge Max Age / 2) + 1". The time
range is from 4 seconds to 30 seconds. The default value is 15.
- Spanning Tree Maximum Hops- Configure the maximum number of hops for the Spanning tree.
Non-Configurable Data
- Bridge identifier -
The bridge identifier for the CST. It is made
up using the bridge priority and the base MAC address of the bridge.
- Time since topology change - The time in seconds since the topology of the
CST last changed.
- Topology change count - Number of times topology has changed for the
CST.
- Topology change - The value of the topology change parameter for
the switch indicating if a
topology change is in progress on any port assigned to the
CST. It takes a value if True or False.
- Designated root - The bridge identifier of the root bridge.
It is made up from the bridge priority and the base MAC address of the
bridge.
- Root Path Cost - Path Cost to the Designated Root for the CST.
- Root Port - Port to access the Designated Root for the CST.
- Max Age - Path Cost to the Designated Root for the CST.
- Forward Delay - Derived value of the Root Port Bridge Forward Delay
parameter.
- Hold Time - Minimum time between transmission of Configuration BPDUs.
- CST Regional Root - Priority and base MAC address of the CST Regional Root.
- CST Path Cost - Path Cost to the CST tree Regional Root.
Command Buttons
- Submit - Applies the new configuration and causes the
changes to take effect.
These changes will not be retained across a power cycle
unless a save configuration is performed.
- Refresh - Refreshes the screen with most recent data.
Help for Spanning Tree MST Configuration/Status
Selection Criteria
- MST ID - Create a new
MST which you wish to configure or configure already existing MSTs.
Configurable Data
- MST ID - This is only visible when the select option of the MST ID select box
is selected. The ID of the MST being created. Valid values for this are between
1 and 4094.
- Priority - The bridge priority for the MST instance selected.
The bridge priority is set in multiples of 4096. For example if
the priority is attempted to be set to any value between 0 and 4095,
it will be set to 0. If it is tried to be set to any value between 4096 and
(2*4096-1) it will be set to 4096 and so on.
- VLAN ID - This gives a list box of all VLANs on the switch.
The VLANs associated with the MST instance which is selected are highlighted
on the list. These can be selected or unselected for re-configuring the
association of VLANs to MST instances.
Non-Configurable Data
- Bridge identifier -
The bridge identifier for the selected MST instance. It is made
up using the bridge priority and the base MAC address of the bridge.
- Time since topology change - The time n seconds since the
topology of the selected MST instance last changed.
- Topology change count - Number of times topology has changed
for the selected MST instance.
- Topology change - The value of the topology change parameter
for the switch indicating
if a topology change is in progress on any port assigned to the
selected MST instance. It takes a value if True or False.
- Designated root - The bridge identifier of the root bridge.
It is made up from the bridge priority and the base MAC address
of the bridge
- Root Path Cost - Path Cost to the Designated Root for this
MST instance.
- Root port - Port to access the Designated Root for this MST
instance.
Command Buttons
- Submit - Applies the new configuration and causes the
changes to take effect.
These changes will not be retained across a power cycle
unless a save configuration is performed.
- Delete - Deletes the selected MST instance. All VLANs associated
with the instance are associated with the CST
- Refresh - Refreshes the screen with most recent data.
Help for Spanning Tree CST Port Configuration/Status
Selection Criteria
- Slot/Port - Selects one of the physical or port channel interfaces associated
with VLANs associated with the CST.
Configurable Data
- Port Priority - The priority for a particular port within the CST.
The port priority is set in multiples of 16. For example if
the priority is attempted to be set to any value between 0 and 15,
it will be set to 0. If it is tried to be set to any value between 16 and
(2*16-1) it will be set to 16 and so on.
- Admin Edge Port - Specifies if the specified port is an Edge Port
within the CIST. It takes a value of TRUE or FALSE, where the default value
is FALSE.
- Port Path Cost - Set the Path Cost to a new value for the specified
port in the common and internal spanning tree. It takes a value
in the range of 1 to 200000000.
- Hello Timer - Configure the value of the parameter for the CST.
- External Port Path Cost - Set the External Path Cost to a new value for the specified
port in the spanning tree. It takes a value in the range of 1 to 200000000.
- Port Mode - Spanning Tree Protocol Administrative Mode associated with the port or
port channel. The possible values are Enable or Disable.
Non-Configurable Data
- Auto-calculate Port Path Cost - Displays whether the path cost is automatically
calculated (Enabled) or not (Disabled). Path cost will be calculated based
on the link speed of the port if the configured value for Port Path Cost is zero.
- Auto-calculate External Port Path Cost - Displays whether the external path cost is automatically
calculated (Enabled) or not (Disabled). External Path cost will be calculated based
on the link speed of the port if the configured value for External Port Path Cost is zero.
- Port ID - The port identifier for the specified port within the CST.
It is made up from the port priority and the interface number of the port.
- Port Up Time Since Counters Last Cleared - Time since the counters were last cleared,
displayed in Days, Hours, Minutes, and Seconds.
- Port Forwarding State - The Forwarding State of this port.
- Port Role - Each MST Bridge Port that is enabled is assigned a Port Role for each spanning tree.
The port role will be one of the following values: Root Port, Designated Port, Alternate Port,
Backup Port, Master Port or Disabled Port.
- Designated Root - Root Bridge for the CST. It is made
up using the bridge priority and the base MAC address of the bridge.
- Designated Cost - Path Cost offered to the LAN by the Designated Port.
- Designated Bridge - Bridge Identifier of the bridge with the
Designated Port. It is made
up using the bridge priority and the base MAC address of the bridge.
- Designated Port - Port Identifier on the Designated Bridge that offers
the lowest cost to the LAN. It is made up from the port priority and
the interface number of the port.
- Topology Change Acknowledge - Identifies whether the next BPDU to be transmitted
for this port would have the topology change acknowledgement flag set.
It is either "True" or "False".
- Edge port - indicates whether the port is enabled as an edge port.
It takes the value "Enabled" or "Disabled".
- Point-to-point MAC - Derived value of the point-to-point status.
- CST Regional Root - Bridge Identifier of the CST Regional Root. It is made
up using the bridge priority and the base MAC address of the bridge.
- CST Path Cost - Path Cost to the CST Regional Root.
Command Buttons
- Submit - Applies the new configuration and causes the
changes to take effect.
These changes will not be retained across a power cycle
unless a save configuration is performed.
- Force - Clicking this button will force the port to send out 802.1w or 802.1d BPDUs.
- Refresh - Refreshes the screen with most recent data.
Help for Spanning Tree MST Port Configuration/Status
Selection Criteria
- MST ID - Selects one MST instance from existing MST instances.
- Slot/Port - Selects one of the physical or port channel interfaces associated
with VLANs associated with the selected MST instance.
Configurable Data
- Port Priority - The priority for a particular port within the
selected MST instance.
The port priority is set in multiples of 16. For example if
the priority is attempted to be set to any value between 0 and 15,
it will be set to 0. If it is tried to be set to any value between 16 and
(2*16-1) it will be set to 16 and so on.
- Port Path Cost - Set the Path Cost to a new value for the specified
port in the selected MST instance. It takes a value
in the range of 1 to 200000000.
Non-Configurable Data
- Auto-calculate Port Path Cost - Displays whether the path cost is automatically
calculated (Enabled) or not (Disabled). Path cost will be calculated based
on the link speed of the port if the configured value for Port Path Cost is zero.
- Port ID - The port identifier for the specified port within the
selected MST instance.
It is made up from the port priority and the interface number of the port.
- Port Up Time Since Counters Last Cleared - Time since the counters were last cleared,
displayed in Days, Hours, Minutes, and Seconds.
- Port Mode - Spanning Tree Protocol Administrative Mode associated with the port or
port channel. The possible values are Enable or Disable.
- Port Forwarding State - The Forwarding State of this port.
- Port Role - Each MST Bridge Port that is enabled is assigned a Port Role for each spanning tree.
The port role will be one of the following values: Root Port, Designated Port, Alternate Port,
Backup Port, Master Port or Disabled Port.
- Designated Root - Root Bridge for the selected MST instance. It is made
up using the bridge priority and the base MAC address of the bridge.
- Designated Cost - Path Cost offered to the LAN by the Designated Port.
- Designated Bridge - Bridge Identifier of the bridge with the
Designated Port. It is made
up using the bridge priority and the base MAC address of the bridge.
- Designated Port - Port Identifier on the Designated Bridge that offers
the lowest cost to the LAN. It is made up from the port priority and
the interface number of the port.
Command Buttons
- Submit - Applies the new configuration and causes the
changes to take effect.
These changes will not be retained across a power cycle
unless a save configuration is performed.
- Refresh - Refreshes the screen with most recent data.
Help for Spanning Tree Statistics
Selection Criteria
- Slot/Port - Selects one of the physical or port channel interfaces of the
switch.
Non-Configurable Data
- STP BPDUs Received - Number of STP BPDUs received at the
selected port.
- STP BPDUs Transmitted - Number of STP BPDUs transmitted from
the selected port.
- RSTP BPDUs Received - Number of RSTP BPDUs received at the selected
port.
- RSTP BPDUs Transmitted - Number of RSTP BPDUs transmitted from the
selected port.
- MSTP BPDUs Received - Number of MSTP BPDUs received at the selected
port.
- MSTP BPDUs Transmitted - Number of MSTP BPDUs transmitted from the
selected port.
Command Buttons
- Refresh - Refreshes the screen with most recent data.