H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – MSTP
H3C S7500E Series Ethernet Switches Chapter 1 MSTP Configuration
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2) Method 2: Perform mCheck in Ethernet interface view.
<Sysname> system-view
[Sysname] interface GigabitEthernet 2/0/1
[Sysname-GigabitEthernet2/0/1] stp mcheck
1.6 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.
1.6.1 Configuration Prerequisites
Associated devices of different vendors are interconnected and run MSTP.
1.6.2 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
—