3Com 8807 Command Reference Manual page 214

212 C 14: D
HAPTER IGEST
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S C C
NOOPING ONFIGURATION OMMANDS
You must enable digest snooping on a port first before enabling it globally.
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Digest snooping is unnecessary if the interconnected switches are from the
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same manufacturer.
When implementing digest snooping, make sure that the domain
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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
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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
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coming from other manufacturers must have digest snooping enabled.
Do not enable digest snooping on border ports of an MSTP domain.
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A digest snooping-enabled switch always keeps the latest configuration digests
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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