of the path from the port to the root bridge and the less likely that the port becomes a root
port.
l
Set a priority for a port in an MSTI: The lower the numerical value, the more likely the port
becomes a designated port; the higher the numerical value, the less likely that the port
becomes a designated port.
8.3.1 Establishing the Configuration Task
Before configuring basic MSTP functions, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the required data. This will help you complete
the configuration task quickly and accurately.
Applicable Environment
Network designers tend to deploy multiple physical links between two devices (one link is the
master and the others are backups) to fulfill network redundancy requirements. Loops are bound
to occur on such types of complex networks.
Loops will cause broadcast storms, thereby exhausting network resources and paralyzing the
network. Loops also cause MAC address flapping that damages MAC address entries.
MSTP can be deployed on a network to eliminate loops. If a loop is detected, MSTP blocks one
or more ports to eliminate the loop. In addition, MSTIs can be configured to load balance VLAN
traffic.
, S1, S2, S3, and S4 all support MSTP. In this scenario, you need to
create MSTI 1 and MSTI 2, configure a root bridge for each MSTI, and set the ports to be blocked
to load balance traffic of VLANs 1 to 10 and VLANs 11 to 20 among different paths.
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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