q-Tech QSW-9010, Руководство по настройке CLI

Страница: 83 / 101

User Manual
8. STP service configuration 83
www.qtech.ru
8. STP SERVICE CONFIGURATION
OLT supports three STP (Spanning Tree Protocol) modes:

STP (Spanning Tree Protocol)

RSTP (Rapid Spanning Tree Protocol)

MSTP (Multiple Spanning Tree Protocol)
STP mode:
STP comply with IEEE802.1d standards.
RSTP mode:
RSTP follows IEEE802.1w standard, a faster convergence rate than STP. When the network topology
changes, the original redundancy switch port in point-to-point connection port condition can quickly
transfer (Discard, Forward).
MSTP mode:
MSTP follows the IEEE802.1s standard and adds the concepts of examples and VLAN mappings. Both
STP and RSTP mode can be considered as a special case of MSTP mode, that is, there is only one
instance of 0. The MSTP mode also provides rapid aggregation and load balancing of the VLAN
environment.
In STP and RSTP mode, there is no concept of VLAN, and there is only one state for each port, that is,
the port is in the same state of forwarding in different VLAN.
In MSTP mode, there can be multiple spanning-tree samples, and the forwarding status of ports
under different VLAN can be different. Within the MST region, multiple independent sub-tree
samples can be formed to achieve load balancing. MSTP is applied to redundant networks, which can
converge quickly and distribute traffic of different VLAN along their paths, thus providing a good load
sharing mechanism for redundant links.
OLT supports the MSTP protocol and is also compatible with STP and RSTP protocol. OLT default
protocol type is STP. No matter which type is configured, it can be fully compatible and interoperable
with the other two types. This article takes RSTP as an example to introduce the configuration of STP.
Steps:
In global configuration mode, enable STP:
OLT (config) # spanning-tree
Configure spanning-tree mode type:
OLT (config) # spanning-tree mode rstp
Configure the bridge priority.
OLT (config) # spanning-tree instance 0 priority 4096
Configure the designated VLAN to designated instance: