Operation Manual - STP
Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration
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1.1.3 Implement RSTP on Ethernet Switch
The Ethernet Switch implements the Rapid Spanning Tree Protocol (RSTP), i.e., the
enhancement of STP. The Forward Delay for the root ports and designated ports to
enter forwarding state is greatly reduced in certain conditions, thereby shortening the
time period for stabilizing the network topology.
To achieve the rapid transition of the root port state, the following requirement should
be met: The old root port on this switch has stopped data forwarding and the
designated port in the upstream has begun forwarding data.
The conditions for rapid state transition of the designated port are:
z The port is an Edge port that does not connect with any switch directly or indirectly.
If the designated port is an edge port, it can switch to forwarding state directly
without immediately forwarding data.
z The port is connected with the point-to-point link, that is, it is the master port in
aggregation ports or full duplex port. It is feasible to configure a point-to-point
connection. However, errors may occur and therefore this configuration is not
recommended. If the designated port is connected with the point-to-point link, it
can enter the forwarding state right after handshaking with the downstream switch
and receiving the response.
The switch that uses RSTP is compatible with the one using STP. Both protocol packets
can be identified by the switch running RSTP and used in spanning tree calculation.
Note:
RSTP is the protocol of single spanning tree. A switching network only has one spanning tree. To
guarantee the normal communication inside a VLAN, the devices of a VLAN shall have routes to one
another on the Spanning Tree, otherwise, the communication inside the VLAN will be affected if some links
inside a VLAN are blocked.
For some VLAN that cannot be arranged along the spanning tree paths for some special requirements,
you have to disable RSTP on the switch port corresponding to the VLAN.
1.2 Configure RSTP
RSTP configuration includes:
z Enable/Disable RSTP on the switch
z Enable/Disable RSTP on the port
z Configure RSTP Operating Mode
z Set priority of a specified bridge
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