Command Manual (For Soliton) – MSTP
H3C S3100 Series Ethernet Switches
Chapter 1 MSTP Configuration Commands
1-27
Parameters
interface-list
: Ethernet port list. You can specify multiple Ethernet ports by providing this
argument in the format of
interface-list
={
interface-type interface-number
[
to
interface-type interface-number
] } &<1-10>, where &<1-10> means that you can
provide up to 10 port indexes/port index ranges for this argument.
Description
Use the
stp interface config-digest-snooping
command to enable the digest
snooping feature on specific ports.
Use the
undo stp interface config-digest-snooping
command to disable the digest
snooping feature on specific ports.
By default, the digest snooping feature is disabled on a port.
According to IEEE 802.1s, two interconnected MSTP 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 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 another manufacturer’s 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 the
another manufacturer’s switch. In this way, the switch can interwork with another
manufacturer’s switches in an MST region.
