HP 3600 v2 series Configuration Manual page 99

CAUTION:
With digest snooping enabled, in-the-same-region verification does not require comparison of
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configuration digest, 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 removal of the
current region configuration via the undo stp region-configuration command are not allowed. You can
modify only the region name and revision level.
To make Digest Snooping take effect, you must enable it both globally and on associated ports. To make
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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.
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HP recommends you to enable Digest Snooping first and then the spanning tree feature. To avoid
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causing traffic interruption, do not configure Digest Snooping when the network is already working well.
Digest Snooping configuration example
Network requirements
1.
As shown in
Device A and Device B connect to Device C, which is a third-party device. All these devices are in
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the same region.
• Enable Digest Snooping on the ports of Device A and Device B that connect to Device C, so that the
three devices can communicate with one another.
Figure 23 Digest Snooping configuration
Configuration procedure
2.
# Enable Digest Snooping on Ethernet 1/0/1 of Device A and enable global Digest Snooping on
Device A.
<DeviceA> system-view
[DeviceA] interface ethernet 1/0/1
[DeviceA-Ethernet1/0/1] stp config-digest-snooping
[DeviceA-Ethernet1/0/1] quit
[DeviceA] stp config-digest-snooping
Figure 23:
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