H3C Technologies H3C S3100 Series Switches - Manual (Page 217)

Operation Manual – MSTP
H3C S3100-52P Ethernet Switch
Chapter 1 MSTP Configuration
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switch running proprietary spanning tree protocols, you can enable the rapid transition
feature on the ports of the H3C series switch operating as the downstream switch.
Among these ports, those operating as the root ports will then send agreement packets
to their upstream ports after they receive proposal packets from the upstream
designated ports, instead of waiting for agreement packets from the upstream switch.
This enables designated ports of the upstream switch to change their states rapidly.
1.7.2 Configuring Rapid Transition
I. Configuration prerequisites
As shown in Figure 1-5, a H3C series switch is connected to another manufacturer's
switch. The former operates as the downstream switch, and the latter operates as the
upstream switch. The network operates normally.
The upstream switch is running a proprietary spanning tree protocol that is similar to
RSTP in the way to implement rapid transition on designated ports. Port 1 is the
designated port.
The downstream switch is running MSTP. Port 2 is the root port.
Port 1
H3C Sw itch
Sw itch coming from other manufacturers
Port 2
Port 1
Sw itch
Sw itch coming from other manufacturers
Port 2
Port 1
H3C Sw itch
Sw itch coming from other manufacturers
Port 2
Port 1
Sw itch
Sw itch coming from other manufacturers
Port 2
Figure 1-5 Network diagram for rapid transition configuration
II. Configuration procedure
1) Configure the rapid transition feature in system view