Operation Manual – MSTP
H3C S5500-EI Series Ethernet Switches
Chapter 1 MSTP Configuration
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Caution:
The
stp mcheck
command is meaningful only when the device works in the MSTP (or
RSTP) mode, not in the STP-compatible mode.
1.5.3 Configuration Example
# Perform mCheck on port GigabitEthernet 1/0/1.
1) Method 1: Perform mCheck globally.
<Sysname> system-view
[Sysname] stp mcheck
2) Method 2: Perform mCheck in Ethernet interface view.
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] 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.
