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z Enable Digest Snooping on Device A’s and Device B’s ports that connect Device C, so that the
three devices can communicate with one another.
Figure 1-8 Digest Snooping configuration
GE1/0/2
GE1/0/1
GE1/0/2 GE1/0/2
GE1/0/1
GE1/0/1
Device A Device B
Third-party device
Root port
Designated port
Blocked port
Device C
2) Configuration procedure
# Enable Digest Snooping on GigabitEthernet 1/0/1 of Device A and enable global Digest Snooping on
Device A.
<DeviceA> system-view
[DeviceA] interface gigabitethernet 1/0/1
[DeviceA-GigabitEthernet1/0/1] stp config-digest-snooping
[DeviceA-GigabitEthernet1/0/1] quit
[DeviceA] stp config-digest-snooping
# Enable Digest Snooping on GigabitEthernet 1/0/1 of Device B and enable global Digest Snooping on
Device B.
<DeviceB> system-view
[DeviceB] interface gigabitethernet 1/0/1
[DeviceB-GigabitEthernet1/0/1] stp config-digest-snooping
[DeviceB-GigabitEthernet1/0/1] quit
[DeviceB] stp config-digest-snooping
Configuring No Agreement Check
In RSTP and MSTP, two types of messages are used for rapid state transition on designated ports:
z Proposal: sent by designated ports to request rapid transition
z Agreement: used to acknowledge rapid transition requests
Both RSTP and MSTP devices can perform rapid transition on a designated port only when the port
receives an agreement packet from the downstream device. The differences between RSTP and MSTP
devices are:
z For MSTP, the downstream device’s root port sends an agreement packet only after it receives an
agreement packet from the upstream device.
z For RSTP, the down stream device sends an agreement packet regardless of whether an
agreement packet from the upstream device is received.
Figure 1-9
shows the rapid state transition mechanism on MSTP designated ports.
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