R0106-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V7)

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Figure 15 Network diagram
Configuration procedure
# Enable Digest Snooping on GigabitEthernet 2/1/1 of Device A and enable global Digest Snooping
on Device A.
<DeviceA> system-view
[DeviceA] interface gigabitethernet 2/1/1
[DeviceA-GigabitEthernet2/1/1] stp config-digest-snooping
[DeviceA-GigabitEthernet2/1/1] quit
[DeviceA] stp global config-digest-snooping
# Enable Digest Snooping on GigabitEthernet 2/1/1 of Device B and enable global Digest Snooping
on Device B.
<DeviceB> system-view
[DeviceB] interface gigabitethernet 2/1/1
[DeviceB-GigabitEthernet2/1/1] stp config-digest-snooping
[DeviceB-GigabitEthernet2/1/1] quit
[DeviceB] stp global config-digest-snooping
Configuring No Agreement Check
In RSTP and MSTP, the following types of messages are used for rapid state transition on designated
ports:
• Proposal—Sent by designated ports to request rapid transition
• 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. RSTP and MSTP devices have the following
differences:
• For MSTP, the root port of the downstream device sends an agreement packet only after it receives
an agreement packet from the upstream device.
• For RSTP, the downstream device sends an agreement packet regardless of whether an agreement
packet from the upstream device is received.
Device C
Root bridge
GE2/1/1 GE2/1/2
GE2/1/1
GE2/1/2
GE2/1/1
GE2/1/2
Root port
Designated port
Normal link
Blocked link
Blocked port
Device A Device B
MST region