H3C S7500 Series Operation Manual page 279

Operation Manual – MSTP
H3C S7500 Series Ethernet Switches
between them. (A configuration ID contains information such as region ID and
configuration digest.)
As some other vendors' switches adopt proprietary spanning tree protocols, they
cannot interwork with other switches in an MST region even if they are configured with
the same MST region-related settings as other switches in the MST region.
This problem can be overcome by implementing the digest snooping function. If a port
on a S7500 switch is connected to another vendor'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 S7500 switch regards the switch
of another vendor as in the same region; it records the configuration digests carried in
the BPDUs received from the switch of another vendor, and put them in the BPDUs to
be sent to the switch of another vendor. In this way, the S7500 switches can interwork
with other vendors' switches in the same MST region.
Caution:
The digest snooping function is not applicable to edge ports.
1.6.2 Digest Snooping Configuration
Configure the digest snooping function on a switch to enable it to interwork with other
switches that adopt 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 vendor's switch that adopts a
proprietary spanning tree protocol. The MSTP network operates normally.
II. Configuration procedure
Follow these steps to configure the digest snooping function:
To do ...
Enter system view
Enter Ethernet port
view
Enable the digest
snooping function
Use the command ...
system-view
interface interface-type
interface-number
stp
config-digest-snooping
1-35
Chapter 1 MSTP Configuration
Remarks
—
—
Required
The digest snooping function
is disabled on the port by
default.