H3C Technologies H3C S12500 Series Switches - Manual (Page 99)

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• The STP device transits to the MSTP, RSTP, or PVST mode.
To forcibly transit the port to operate in the original mode, you can perform an mCheck operation. An
mCheck operation takes effect on a device that operates in MSTP, RSTP, or PVST mode.
The following methods for performing mCheck produce the same result.
Performing mCheck globally
Step Command
1. Enter system view. system-view
2. Perform mCheck. stp mcheck
Performing mCheck in interface view
Step Command
1. Enter system view. system-view
2. Enter Ethernet interface view or Layer 2 aggregate
interface view.
interface interface-type interface-number
3. Perform mCheck. stp mcheck
Configuring the VLAN Ignore feature
Traffic of a VLAN on a complex network might be blocked by the spanning tree.
Figure 22 VLAN connectivity blocked by MSTP
As shown in Figure 22 :
• Port A1 on Device A allows the traffic of VLAN 1 to pass through, and Port A2 allows the traffic of
VLAN 2 to pass through.
• Port B1 on Device B allows the traffic of VLAN 1 to pass through, and Port B2 allows the traffic of
VLAN 2 to pass through.
• Device A and Device B run a spanning tree protocol. Device A is the root bridge, and Port A1 and
Port A2 are designated ports. On Device B, Port B1 is the root port, and port B2 is the blocked port.
Traffic of VLAN 2 is blocked.