H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 191)

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2) Method 2: Perform mCheck in Ethernet interface view.
<Sysname> system-view
[Sysname] interface GigabitEthernet 0/0/1
[Sysname-GigabitEthernet0/0/1] stp mcheck
Configuring Digest Snooping
As defined in IEEE 802.1s, interconnected devices are in the same region only when the region-related
configuration (domain name, revision level, VLAN-to-instance mappings) on them is identical. An
MSTP-enabled device identifies devices in the same MST region by checking the configuration ID in
BPDU packets. The configuration ID includes the region name, revision level, configuration digest that
is in 16-byte length and is the result calculated via the HMAC-MD5 algorithm based on
VLAN-to-instance mappings.
Since MSTP implementations differ with vendors, the configuration digest calculated using private key
is different; hence different vendors’ devices in the same MST region can not communicate with each
other.
Enabling the Digest Snooping feature on the associated port can make a device communicate with
another vendor’s device in the same MST region.
Configuration Prerequisites
Associated devices of different vendors are interconnected and run MSTP.
Configuration Procedure
Follow these steps to configure Digest Snooping:
To do... Use the command... Remarks
Enter system view system-view —
Enter Ethernet
interface view interface interface-type
interface-number
Enter Ethernet
interface or port
group view
Enter port group
view
port-group { manual
port-group-name | aggregation
agg-id }
Required
Use either command.
Configurations made in Ethernet
interface view will take effect on
the current port only;
configurations made in port group
view will take effect on all ports in
the port group.
Enable digest snooping on the
interface or port group
stp config-digest-snooping
Required
Not enabled by default
Return to system view quit —
Enable global digest snooping stp config-digest-snooping
Required
Not enabled by default