H3C Technologies H3C S3100 Series Switches - Manual (Page 214)

Operation Manual – MSTP
H3C S3100-52P Ethernet Switch
Chapter 1 MSTP Configuration
1-39
the BPDUs between them. (A configuration ID contains information such as region ID
and configuration digest.)
As some other manufacturers' switches adopt proprietary spanning tree protocols, they
cannot interwork with the other switches in an MST region even if they are configured
with the same MST region-related settings as the other switches in the MST region.
This problem can be overcome by implementing the digest snooping feature. If a port
on an S3100-52P Ethernet switch is connected to another manufacturer's switch that
has the same MST region-related configuration as its own but adopts a proprietary
spanning tree protocol, you can enable digest snooping on the port. Then the
S3100-52P Ethernet switch regards another manufacturer's switch as in the same
region; it records the configuration digests carried in the BPDUs received from another
manufacturer's switch, and put them in the BPDUs to be sent to the another
manufacturer's switch. In this way, the S3100-52P Ethernet switch can interwork with
another manufacturer’s switches in the same MST region.
1.6.2 Configuring Digest Snooping
Configure the digest snooping feature on a switch to enable it to interwork with other
switches adopting proprietary protocols to calculate configuration digests in the same
MST region through MSTIs.
I. Configuration prerequisites
The switch to be configured is connected to another manufacturer's switch adopting a
proprietary spanning tree protocol. The MSTP and the network operate normally.
II. Configuration procedure
Table 1-36 Configure digest snooping
Operation Command Description
Enter system view system-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Enable the digest
snooping feature stp
config-digest-snooping
Required
The digest snooping
feature is disabled on the
port by default.
Return to system view quit —
Enable the digest
snooping feature globally stp
config-digest-snooping
Required
The digest snooping
feature is disabled
globally by default.