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3Com Switch 7750 Series
Command Reference Guide – MSTP Chapter 1
MSTP Configuration Commands
1-23
The rapid transition feature is disabled on any port by default.
Some manufactures' switches adopt proprietary spanning tree protocols that are
similar to RSTP in the way to implement rapid transition on designated ports. When a
switch of this kind operates as the upstream switch of an Switch 7750 series switch
running MSTP, the upstream designated port fails to change their states rapidly.
The rapid transition feature is developed to avoid this case. When an Switch 7750
series switch running MSTP is connected in the upstream direction to a manufacture's
switch running proprietary spanning tree protocol, you can enable the rapid transition
feature on the ports of the Switch 7750 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.
Related command: stp no-agreement-check.
Note:
z The rapid transition feature can be enabled on root ports or alternate ports only.
z If you configure the rapid transition feature on the designated port, the feature does
not take effect on the port.
Example
# Enable the rapid transition feature for Ethernet1/0/1 port.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com]stp interface Ethernet1/0/1 no-agreement-check
1.1.22 stp interface point-to-point
Syntax
stp interface interface-list point-to-point { force-true | force-false | auto }
undo stp interface interface-list point-to-point
View
System view
Parameter
interface-list: Ethernet port list. You can specify multiple Ethernet ports by providing this
argument in the form of interface-list = { interface-type interface-number [ to