H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 81)

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Follow these steps to configure Digest Snooping:
To do... Use the command... Remarks
Enter system view system-view —
Enter interface view or port group
view
Enter Ethernet interface view or
Layer 2 aggregate interface view
interface interface-type
interface-number
Enter port group view
port-group manual
port-group-name
Required
Use either command.
Enable Digest Snooping on the
interface or port group
stp config-digest-snooping
Required
Disabled by default.
Return to system view quit —
Enable global Digest Snooping stp config-digest-snooping
Required
Disabled by default.
CAUTION:
•
With the Digest Snooping feature enabled, comparison of configuration digest is not needed for
in-the-same-region check, so the VLAN-to-instance mappings must be the same on associated ports.
• With global Digest Snooping enabled, modification of VLAN-to-instance mappings and removing of
the current region configuration using the undo stp region-configuration command are not allowed.
You can only modify the region name and revision level.
• To make Digest Snooping take effect, you must enable it both globally and on associated ports. To make
the configuration effective on all configured ports and while reducing impact on the network, enable
Digest Snooping on all associated ports first and then globally.
• To prevent loops, do not enable Digest Snooping on MST region edge ports.
• H3C recommends you to enable Digest Snooping first and then the spanning tree feature. To avoid
traffic interruption, do not configure Digest Snooping when the network is already working well.
Digest Snooping configuration example
1. Network requirements
As shown in Figure 18 :
• Device A and Device B connect to Device C, which is a third-party device. All these devices are in
the same region.
• Enable Digest Snooping on Device A’s and Device B’s ports that connect to Device C, so that the
three devices can communicate with one another.