Configuration Example; Configuring Digest Snooping; Configuration Prerequisites - H3C LS-3100-52P-OVS-H3 Operation Manual

Performing mCheck in interface view
Follow these steps to perform mCheck in interface view:
Enter system view
Enter Ethernet interface view or Layer-2
aggregate interface view
Perform mCheck

Configuration Example

# Perform mCheck on port GigabitEthernet1/0/1.
1) Method 1: Perform mCheck globally.
<Sysname> system-view
[Sysname] stp mcheck
2) Method 2: Perform mCheck in interface view.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] 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-MSTI mappings) on them is identical. An MSTP
enabled device identifies devices in the same MST region via 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-MSTI
mappings.
Since MSTP implementations differ with vendors, the configuration digests calculated using private
keys is different; hence different vendors' devices in the same MST region can not communicate with
each other.
Enabling the Digest Snooping feature on the port connecting the local device to another vendor's device
in the same MST region can make the two devices communicate with each other.

Configuration Prerequisites

Associated devices of different vendors are interconnected and run MSTP.
To do... Use the command...
system-view
interface interface-type
interface-number
stp mcheck
1-32
Remarks
—
—
Required