Command Manual (For Soliton) – MSTP
H3C S3100 Series Ethernet Switches
Chapter 1 MSTP Configuration Commands
1-19
# Restore the default mode in which a port recognizes and send MSTP packets.
[Sysname-Ethernet1/0/1] undo stp compliance
1.1.17 stp config-digest-snooping
Syntax
stp config
-
digest
-
snooping
undo stp config
-
digest
-
snooping
View
System view, Ethernet port view
Parameters
None
Description
Use the
stp config-digest-snooping
command to enable the digest snooping feature
globally.
Use the
undo stp config-digest-snooping
command to disable the digest snooping
feature globally.
The digest snooping feature is disabled by default.
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. With MSTP enabled, interconnected 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 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 kind of problems can be overcome by implementing the digest snooping feature. If
a switch port is connected to another manufacturer’s switch that has the same MST
region-related settings but adopts a proprietary spanning tree protocol, you can enable
the digest snooping feature on the port when it receives BPDU packets from another
manufacturer's switch. Then the switch considers these BPDU packets to be from its
own MST region and records the configuration digests carried in the BPDU packets
received from the switch, which will be put in the BPDU packets to be sent to another
manufacturer’s switch. In this way, the switch can interwork with another
manufacturer’s switches in an MST region.
