H3C Technologies H3C SecPath F1000-E - Manual (Page 124)

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[DeviceB] interface ethernet 1/1
[DeviceB-Ethernet1/1] stp config-digest-snooping
[DeviceB-Ethernet1/1] quit
[DeviceB] stp 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 downstream device's root port 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.
Figure 54 shows the rapid state transition mechanism on MSTP designated ports.
Figure 54 Rapid state transition of an MSTP designated port
Figure 55 shows rapid state transition of an RSTP designated port.