3Com Switch 7750 Configuration Guide

Rapid Transition Configuration 269
the BPDUs to be send to the partner’s switch. In this way, the Switch 7750s can
interwork with the partners’ switches in the same MST region.
Digest Snooping
Configuration
Configure the digest snooping 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 your 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 your Switch 7750 that are connected to partner’s proprietary
protocol-adopted switches and then enable it globally.
■ To enable the digest snooping feature, the interconnected switches must be
configured with exactly the same MST region-related configurations (including
region name, revision level, and VLAN-to-MSTI mapping).
■ The digest snooping feature must be enabled on all the ports of your Switch
7750 that are connected to partners’ proprietary protocol-adopted switches in
the same MST region.
■ With the digest snooping feature is enabled, the VLAN-to-MSTI mapping
cannot be modified.
■ The digest snooping feature is not applicable on MST region edge ports.
Rapid Transition
Configuration
Introduction Designated ports on switches adopting RSTP or MSTP use the following two types
of packets to implement rapid transition:
Table 204 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.