3Com Switch 8800 Family Command Reference Guide

212 CHAPTER 14: DIGEST SNOOPING CONFIGURATION COMMANDS

■ You must enable digest snooping on a port first before enabling it globally.

■ Digest snooping is unnecessary if the interconnected switches are from the

same manufacturer.

■ When implementing digest snooping, make sure that the domain

configurations of the switches of different manufacturers are exactly the same

to prevent possible broadcast storm caused by otherwise inconsistent mapping

relationships between VLANs and VPN instances of each switch.

■ If you want to change the configuration of a domain with one or multiple of its

switches being digest snooping-enabled, be sure to disable digest snooping on

these switches first to prevent possible broadcast storm caused by otherwise

inconsistent mapping relationships between VLANs and VPN instances of each

switch.

■ To enable digest snooping, all ports in an MSTP domain connecting to switches

coming from other manufacturers must have digest snooping enabled.

■ Do not enable digest snooping on border ports of an MSTP domain.

■ A digest snooping-enabled switch always keeps the latest configuration digests

it receives. A configuration digest remains valid even if the corresponding port

goes down.

Example

# Enable digest snooping on the GigabitEthernet3/1/1 port.

<SW8800> system-view

System View: return to User View with Ctrl+Z.

[SW8800] interface GigabitEthernet3/1/1

[3Com-GigabitEthernet3/1/1] stp config-digest-snooping

[3Com-GigabitEthernet3/1/1] quit

[SW8800]stp config-digest-snooping