Configuring Digest Snooping; Introduction - H3C S5100-SI Operation Manual

Configuration Prerequisites
MSTP runs normally on the switch.
Configuration procedure
Follow these steps to configure BPDU dropping:
To do...
Enter system view
Enter Ethernet port view
Enable BPDU dropping
Configuration example
# Enable BPDU dropping on GigabitEthernet 1/0/1.
<Sysname>system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] bpdu-drop any

Configuring Digest Snooping

Introduction

According to IEEE 802.1s, two interconnected switches can communicate 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
communicate 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 S5100
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 S5100 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 S5100 Ethernet switch can communicate with another manufacturer's switches in the
same MST region.
The digest snooping function is not applicable to edge ports.
Use the command...
system-view
interface interface-name
bpdu-drop any
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Remarks
—
—
Required
BPDU dropping is disabled by default.