The following table lists the default STP states for
RUCKUS devices.
Default STP States
Device Type
Default STP Type
Default STP State
Default STP State of New VLANs1
Switch image default
STP 802.1D
Enabled
Enabled
Router image default
STP 802.1D
Enabled
Disabled
1. When you create a port-based VLAN,
the new VLAN STP state is the same as the default STP state on the device. The
new
VLAN does not inherit the STP state of the default VLAN. Single Spanning Tree
Protocol (SSTP) is another type of STP. SSTP includes all VLANs on which STP is
enabled in a single spanning tree. Refer to Single Spanning Tree (SSTP).
The following table lists the default STP
bridge parameters. The bridge parameters affect the entire spanning tree. If you
are
using Multiple Spanning Tree Protocol (MSTP), the parameters affect the VLAN. If
you are
using Single Spanning Tree Protocol (SSTP), the parameters affect all VLANs that
are
members of the single spanning tree.
Default STP Bridge Parameters
Parameter
Description
Default and Valid Values
Forward Delay
The period of time spent by a port in the listening and learning state before moving
on to the learning or forwarding state, respectively.
The forward delay value is also used for the age time of dynamic entries in the filtering
database, when a topology change occurs.
15 seconds
Possible values: 4 through 30 seconds
Maximum Age
The interval a bridge will wait for a configuration BPDU from the root bridge before
initiating a topology change.
20 seconds
Possible values: 6 through 40 seconds
Hello Time
The interval of time between each configuration BPDU sent by the root bridge.
2 seconds
Possible values: 1 through 10 seconds
Priority
A parameter used to identify the root bridge in a spanning tree (instance of STP).
The bridge with the lowest value has the highest priority and is the root.
A higher numerical value means a lower priority; thus, the highest priority is 0.
32768
Possible values: 0 through 65535
Note: If you plan to change STP bridge timers,
RUCKUS recommends that you stay within the following ranges, from section 8.10.2 of the
IEEE STP specification. 2 * (forward_delay -1) >= max_agemax_age >= 2 * (hello_time
+1)
The following table lists the default STP port parameters. The port parameters affect
individual ports and are separately configurable on each port.
Default STP Port Parameters
Parameter
Description
Default and Valid Values
Priority
The preference that STP gives this port relative to other ports for forwarding traffic
out of the spanning tree.
A higher numerical value means a lower priority.
128
Possible values: 0 through 240 (configurable in increments of 16)
Path Cost
The cost of using the port to reach the root bridge. When selecting among multiple
links to the root bridge, STP chooses the link with the lowest path cost and blocks
the other paths. Each port type has its own default STP path cost.