H3C Technologies H3C S7500E Series Switches - Manual (Page 188)

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# Enable Digest Snooping on GigabitEthernet 2/0/1 of Device B and enable global Digest Snooping on
Device B.
system-view
[DeviceB] interface gigabitethernet 2/0/1
[DeviceB-GigabitEthernet2/0/1] stp config-digest-snooping
[DeviceB-GigabitEthernet2/0/1] 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:
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. The differences between RSTP and
MSTP devices are:
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 down stream device sends an agreement packet regardless of whether an
agreement packet from the upstream device is received.
Figure 13-7 shows the rapid state transition mechanism on MSTP designated ports.
Figure 13-7 Rapid state transition of an MSTP designated port
Figure 13-8 shows rapid state transition of an RSTP designated port.