Operation Manual – MSTP
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
MSTP Configuration
1-38
1.6 Configuring Digest Snooping
1.6.1 Introduction
According to IEEE 802.1s, two interconnected switches can interwork with each other
through MSTIs in an MST region only when the two switches have the same MST
region-related configuration. Interconnected MSTP-enabled switches determine
whether or not they are in the same MST region by checking the configuration IDs of
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 S3600 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 S3600
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 S3600 Ethernet switch can interwork with another manufacturer’s
switches in the same MST region.
Caution:
The digest snooping function is not applicable to edge ports.
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.
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