H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur télécharger pdf (Page 99)

# 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, 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 is received from the upstream device.

Figure 21 Rapid state transition of an MSTP designated port

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H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur Page 99