H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 176)

163
Item Description
BPDU Guard
Select whether to enable BPDU guard
BPDU guard can protect the device from malicious BPDU attacks, making the
network topology stable.
Mode
Set the working mode of STP, which can be STP, RSTP, or MSTP.
• STP: Each port on a device sends out STP BPDUs.
• RSTP: Each port on a device sends out RSTP BPDUs, and automatically migrates
to STP-compatible mode when detecting that it is connected with a device
running STP.
• MSTP: Each port on a device sends out MSTP BPDUs, and automatically migrates
to STP-compatible mode when detecting that it is connected with a device
running STP.
Max Hops
Set the maximum number of hops in an MST region to restrict the region size.
The setting can take effect only when it is configured on the regional root bridge.
Path Cost Standard
Specify the standard for path cost calculation. It can be Legacy, IEEE 802.1D-1998,
or IEEE 802.1T.
Bridge Diameter
Any two stations in a switched network are interconnected through a specific path
composed of a series of devices. The bridge diameter (or the network diameter) is
the number of devices on the path composed of the most devices.
After you set the network diameter, you cannot set the timers. Instead, the device
automatically calculates the forward delay, hello time, and max age.
IMPORTANT:
• The configured network diameter is effective for CIST only, not for MSTIs.
• The bridge diameter cannot be configured together with the timers.
Timers
Forward
Delay Set the delay for the root and designated
ports to transit to the forwarding state.
IMPORTANT:
• The settings of hello time,
forward delay and max age
must meet a certain formula.
Otherwise, the network
topology will not be stable. H3C
recommends you to set the
network diameter and then have
the device automatically
calculate the forward delay,
hello time, and max age.
• The bridge diameter cannot be
configured together with the
timers.
Hello Time
Set the interval at which the device sends
hello packets to the surrounding devices to
make sure that the paths are fault-free.
Max Age
Set the maximum length of time a
configuration BPDU can be held by the
device.
Instance
Instance ID Set the role of the device in the MSTI or the bridge priority of the device, which is one
of the factors deciding whether the device can be elected as the root bridge.
Role of the device in the MSTI:
• Not Set: Not set (you can set the bridge priority of the device when selecting this
role)
• Primary: Configure the device as the root bridge (you cannot set the bridge
priority of the device when selecting this role)
• Secondary: Configure the device as a secondary root bridge (you cannot set the
bridge priority of the device when selecting this role).
Root Type
Bridge
Priority