3Com Switch 7750 Configuration Guide Guide

Digest Snooping Configuration 251
of the BPDUs between them. (A configuration ID contains information such as
region ID and configuration digest.)
As some partners’ 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 feature. If a
port on Switch 7750 Family is connected to a partner’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 Switch 7750
Family regards the partner’s switch as in the same region; it records the
configuration digests carried in the BPDUs received from the partner’s switch, and
put them in the BPDUs to be send to the partner’s switch. In this way, the Switch
7750 Family can interwork with the partner’s switches in the same MST region.
Digest Snooping
Configuration
Configure the digest sooping feature 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.
Prerequisites
The switch to be configured is connected to a partner’s switch that adopts a
proprietary spanning tree protocol. The MSTP network operates normally.
Configuration procedure
n
■ The digest snooping feature is needed only when the Switch 7750 is connected
to partner’s proprietary protocol-adopted switches.
■ To enable the digest snooping feature successfully, you must first enable it on
all the ports of the Switch 7750 Family that are connected to partner’s
proprietary protocol-adopted switches and then enable it globally.
Table 186 Configure the digest snooping feature
Operation Command Description
Enter system view system-view -
Enter Ethernet port view
interface interface-type
interface-number
-
Enable the digest snooping
feature
stp config-digest-snooping
Required
The digest snooping feature is
disabled on the port by
default.
Return to system view Quit -
Enable the digest snooping
feature globally
stp config-digest-snooping
Required
The digest snooping feature is
disabled globally by default.
Verify the above configuration
display
current-configuration
You can execute this
command in any view.