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z When the digest snooping feature is enabled on a port, the port turns to the discarding state. That is,
the port stops sending BPDU packets. The port is not involved in the STP calculation until it
receives BPDU packets from the peer port.
z The digest snooping feature is needed only when your switch is connected to another
manufacturer’s switches adopting proprietary spanning tree protocols.
z To enable the digest snooping feature, the interconnected switches and another manufacturer’s
switch adopting proprietary spanning tree protocols must be configured with exactly the same MST
region-related configurations (including region name, revision level, and VLAN-to-instance
mapping).
z The digest snooping feature must be enabled on all the switch ports that connect to another
manufacturer’s switches adopting proprietary spanning tree protocols in the same MST region.
z When the digest snooping feature is enabled globally, the VLAN-to-instance mapping table cannot
be modified.
z The digest snooping feature is not applicable to boundary ports in an MST region.
z The digest snooping function is not applicable to edge ports in an MST region.
Examples
# Enable the digest snooping feature on Ethernet 1/0/1.
z Enable the digest snooping feature on Ethernet 1/0/1 in Ethernet port view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] stp config-digest-snooping
[Sysname-Ethernet1/0/1] quit
[Sysname] stp config-digest-snooping
z Enable the digest snooping feature on Ethernet 1/0/1 in system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp interface Ethernet 1/0/1 config-digest-snooping
[Sysname] stp config-digest-snooping
# Enable the digest snooping feature on Ethernet 1/0/2 to Ethernet 1/0/4.
<Sysname> system-view
[Sysname] stp interface Ethernet 1/0/2 to Ethernet1/0/4 config-digest-snooping
[Sysname] stp config-digest-snooping
stp cost
Syntax
z Ethernet port view:
stp [ instance instance-id ] cost cost
undo stp [ instance instance-id ] cost
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