H3C Technologies H3C S12500 Series Switches - Manual (Page 100)

87
• Enabling the VLAN Ignore feature for a VLAN can make ports of the VLAN forward packets
correctly rather than comply with the spanning tree calculation result.
Configuration procedure
To configure the VLAN Ignore feature:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable VLAN Ignore for the
specified VLANs.
stp ignored vlan vlan-list
By default, VLAN Ignore is
disabled.
3. Display VLAN Ignore-enabled
VLANs.
display stp ignored-vlan [ |
{ begin | exclude | include }
regular-expression ]
Optional.
Available in any view.
Configuration example
Network requirements
As shown in Figure 23 :
• Device A and Device B are directly connected.
• GigabitEthernet 4/0/1 on Device A and GigabitEthernet 4/0/1 on Device B allow the traffic of
VLAN 1 to pass through. GigabitEthernet 4/0/2 on Device A and GigabitEthernet 4/0/2 on
Device B allow the traffic of VLAN 2 to pass through.
• Device A is the root bridge, and Device A and Device B both run a spanning tree protocol.
GigabitEthernet 4/0/2 on Device B is blocked, causing traffic of VLAN 2 to be blocked.
Configure VLAN Ignore to keep GigabitEthernet 4/0/2 of Device B in the forwarding state.
Figure 23 Network diagram
Configuration procedure
# Enable VLAN Ignore for VLAN 2 on Device B.
<DeviceB> system-view
[DeviceB] stp ignored vlan 2
# Display the VLAN Ignore-enabled VLAN.
[DeviceB] display stp ignored-vlan
STP-Ignored VLAN: 2
GE4/0/1
Device A Device B
VLAN 1
VLAN 2 GE4/0/2
GE4/0/1
GE4/0/2
Root port Designated port
Normal link Blocked link
Blocked port
Root
bridge