3Com Switch 7750 Configuration Guide

272 CHAPTER 30: MSTP CONFIGURATION
Configuration procedure
1 Configure the rapid transition feature in system view.
2 Configure in Ethernet port view.
n
■ The rapid transition feature can be enabled on root ports or alternate ports
only.
■ If you configure the rapid transition feature on the designated port, the feature
does not take effect on the port.
BPDU Tunnel
Configuration
Introduction The BPDU Tunnel function enables BPDUs to be transparently transmitted between
geographically dispersed user networks through specified VLAN VPNs in operator’s
networks, through which spanning trees can be generated across these user
networks and are independent of those of the operator’s network.
As shown in Figure 65, the upper part is the operator’s network, and the lower
part is the user network. The operator’s network comprises packet ingress/egress
devices, and the user’s network has networks A and B. On the operator’s network,
configure the arriving BPDU packets at the ingress to have MAC addresses in a
special format, and reconvert them back to their original formats at the egress.
This is how transparent transmission is implemented on the operator’s network.
Table 205 Configure the rapid transition feature in system view
Operation Command Description
Enter system view system-view -
Enable the rapid
transition feature
stp interface interface-type
interface-number
no-agreement-check
Required
By default, the rapid transition
feature is disabled on a port.
Table 206 Configure the rapid transition feature in Ethernet port view
Operation Command Description
Enter system view system-view -
Enter Ethernet port
view
interface interface-type
interface-number
-
Enable the rapid
transition feature
stp no-agreement-check Required
By default, the rapid transition
feature is disabled on a port.