Huawei AR3200 Series - Page 252

l To configure all ports on the devices as BPDU filter ports, run:
stp bpdu-filter default
By default, a port is a non-BPDU filter port.
After ports on a network edge device are configured as BPDU filter ports, the ports no longer
process or send BPDUs.
WARNING
After the stp bpdu-filter default and stp edged-port default commands are run in the system
view, all ports on the device no longer actively send BPDUs or negotiate with directly-connected
ports; instead, all the ports are in the Forwarding state. This may lead to a loop on the network,
causing broadcast storms. Exercise caution when running these commands.
Step 5 (Optional) To set the Forward Delay period, Hello timer, and Max Age timer, perform the
following operations:
l Run the stp timer forward-delay forward-delay command to set the Forward Delay timer.
The default Forward Delay timer of a switching device is 1500 centiseconds.
l Run the stp timer hello hello-time command to set the Hello timer.
The default Hello timer of a switching device is 200 centiseconds.
l Run the stp timer max-age max-age command to set the Max Age timer.
The default Max Age timer of a switching device is 2000 centiseconds.
NOTE
The values of the Hello timer, Forward Delay timer, and Max Age timer must comply with the following
formulas; otherwise, network flapping occurs.
l 2 x (Forward Delay - 1.0 second) >= Max Age
l Max Age >= 2 x (Hello Time + 1.0 second)
Step 6 Run:
stp max-hops hop
The maximum hop count is set for the MST region.
By default, the maximum hop count in an MST region is 20.
Step 7 Run:
stp mcheck
MCheck is enabled.
On a switching device running MSTP, if an interface is connected to a device running STP, the
interface automatically transitions to the STP mode.
Enabling MCheck on the interface is required because the interface may fail to automatically
transition to the MSTP mode in the following situations:
l The switching device running STP is shut down or moved.
l The switching device running STP transitions to the MSTP mode.
Huawei AR3200 Series Enterprise Routers
Configuration Guide - LAN 8 MSTP Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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