Data Preparation
To complete the configuration, you need the following data.
l Ethernet interface number: as shown in Figure 7-3
l Primary root bridge: RouterA
l Secondary root bridge: SwitchA
l Path cost of the interface to be blocked: 200000
Procedure
Step 1 Configure basic STP functions.
1. Configure the STP mode for the devices on the ring network.
# Configure the STP mode on RouterA.
<Huawei> system-view
[Huawei] sysname RouterA
[RouterA] stp mode stp
# Configure the STP mode on SwitchA, SwitchB, SwitchC and SwitchD.
NOTE
l Huawei 2300 Series Switch is used in this example. If other types of switches are used, refer to
the documentation of the switches.
2. Configure primary and secondary root bridges.
# Configure RouterA as the primary root bridge.
[RouterA] stp root primary
# Configure SwitchA as the secondary root bridge.
3. Set path costs for ports in each spanning tree to block certain ports.
NOTE
l The values of path costs depend on path cost calculation methods. This example uses the Huawei
proprietary calculation method and sets the path cost to 200000.
l If the switches are not Huawei 2300 Series, all switches on a network must use the same path
cost calculation method. Refer to STP List of path costs to get standard of other calculation
methods.
# On RouterA, configure the path cost calculation method as the Huawei proprietary
method.
[RouterA] stp pathcost-standard legacy
# On SwitchA, SwitchB, SwitchC and SwitchD, configure the path cost calculation method
as the Huawei proprietary method.
# As shown in Figure 7-3, set the path cost of Eth0/0/4 on SwitchC and SwitchD to 200000.
4. Enable STP to eliminate loops.
l Disable STP on interfaces connected to PCs.
# Disable STP on interfaces connected to terminals for SwitchC and SwitchD.
l Enable STP globally.
# Enable STP globally on RouterA.
[RouterA] stp enable
# Enable STP globally on other switching devices.
l Enable STP on all the interfaces except the interfaces connected to terminals.
Huawei AR3200 Series Enterprise Routers
Configuration Guide - LAN 7 STP/RSTP Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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