Huawei Quidway S7700 Configuration Manual - Ethernet page 437

Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet
Table 9-1 Comparison between STP, RSTP, and MSTP
Spanning Tree
Protocols
STP
RSTP
MSTP
Introduction
On a complex network, loops are inevitable. With the requirement for network redundancy
backup, network designers tend to deploy multiple physical links between two devices, one of
which is the master and the others are the backup. Loops are likely or bound to occur in such a
situation.
Loops will cause broadcast storms, thereby exhausting network resources and paralyzing the
network. Loops also cause flapping of MAC address tables and thus damages MAC address
entries.
MSTP, compatible with STP and RSTP, isolates service traffic and user traffic by using multiple
instances and provides multiple paths to load balance VLAN traffic.
Issue 01 (2011-07-15)
Characteristics
A loop-free tree is generated.
Thus, broadcast storms are
prevented and redundancy is
implemented.
l A loop-free tree is
generated. Thus,
broadcast storms are
prevented and redundancy
is implemented.
l A feedback mechanism is
provided to confirm
topology convergence.
Thus, rapid convergence
is implemented.
l A loop-free tree or some
loop-free trees are
generated. Thus,
broadcast storms are
prevented and redundancy
is implemented.
l A feedback mechanism is
provided to confirm
topology convergence.
Thus, rapid convergence
is implemented.
l MSTP implements load
balancing among VLANs.
Traffic in different
VLANs is transmitted
along different paths.
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9 MSTP Configuration
Application Precautions
Scenarios
NOTE
Irrespective of
different users or
l If the current
services, all
VLANs share one
spanning tree.
l If the current
User or service-
specific load
balancing is
required. Traffic
for different
VLANs is
forwarded
through different
l If the current
spanning trees,
which are
independent of
each other.
switching
device
supports
only STP,
STP is
recommende
d. For
details, see
STP/RSTP
Configurati
on.
switching
device
supports
both STP
and RSTP,
RSTP is
recommende
d. For
details, see
STP/RSTP
Configurati
on.
switching
device
supports
STP or
RSTP, and
MSTP,
MSTP is
recommende
d.
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