Cisco VS-C6509E-S720-10G User Manual page 336

C6576M VLAN Dialog Box
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Root Election Area
The Root Election area of the C6576M VLAN dialog provides the following information:
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Advanced Area
The Advanced area of the C6576M VLAN dialog box allows you to configure the attributes described
in this section. While these attributes are configurable, this is not the recommended method for
configuring them. Alternately, if you specify a network diameter but no hello time, forward-delay timer,
or max-age timer, using the Set Root button (in the Root Election Area) causes the switch to
automatically calculate the optimal hello time, forward-delay timer, and max-age timer for that diameter.
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Cisco 6500/7600 Series Manager User Guide
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Current Root MAC—Bridge identifier address. This is the MAC address of the VLAN on the root
bridge in the STP instance. If there is no spanning tree instance for the VLAN, the value is nil. This
attribute is read-only.
Root Path Cost—If this is not the root of the spanning tree, indicates the path cost to the root (this
is the path cost of the root port). If the switch is currently the root or there is no spanning tree
instance for the VLAN, the value is nil. This attribute is read-only.
Root Preference—STP root priority. This attribute may has following values:
– no (0)
– primary (1)
– secondary (2)
Hello Time—Hello-time in seconds.
Diameter—Specifies the network diameter (maximum number of bridges between two end nodes).
If specified, the switch will calculate the optimal hello-time, forward-time, and max-age. User may
optionally specify an explicit hello-time.
Set Root button—Configures the root priority of the device in the VLAN STP instance. This action
will set the VLAN STP bridge-priority and reset the hello-time, forward-delay, and max-age timers.
This action does not guarantee that the switch will be elected the STP root, it only sets these values.
Hello Time—Indicates how often the switch broadcasts hello messages to other switches in the STP
domain. If there is no spanning tree instance for the VLAN, value is nil. You can optionally provide
a diameter and hello-time to override the calculated value. If no diameter or hello-time are provided,
the switch will use the default hello time of 2 seconds.
Priority—Spanning tree bridge priority. If there is no spanning tree instance for the VLAN, the
value is nil.
Forward Delay—Forward delay timer for STP state transitions. Determines how long each of the
listening and learning states will last before the interface begins forwarding. If there is no spanning
tree instance for the VLAN, the value is nil. If no diameter is specified, the switch will use the
default delay of 15 seconds.
Max Age—Describes the amount of time that STP protocol information received by a switch is
stored before it expires. If there is no spanning tree instance for the VLAN, the value is nil. If no
diameter is specified, the switch will use the default duration of 20 seconds.
Chapter 6 Logical Object Dialog Boxes