3Com 4210 PWR Configuration Manual page 182

180 C 14: MSTP C
HAPTER
Configuring Rapid
Transition
ONFIGURATION
manufacturer's switch running proprietary spanning tree protocols, you can enable
the rapid transition feature on the ports of the 3Com 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.
Configuration prerequisites
As shown in Figure 53, a 3Com 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.
Figure 53 Network diagram for rapid transition configuration
Configuration procedure
1 Configure the rapid transition feature in system view
Table 136 Configure the rapid transition feature in system view
Operation
Enter system view
Enable the rapid transition
feature
2 Configure the rapid transition feature in Ethernet port view
Table 137 Configure the rapid transition feature in Ethernet port view
Operation
Enter system view
Command
system-view
stp interface interface-type
interface-number
no-agreement-check
Command
system-view
Description
-
Required
By default, the rapid transition
feature is disabled on a port.
Description
-