Configuring No Agreement Check - H3C S7500E Series Operation Manual

Operation Manual – MSTP
H3C S7500E Series Ethernet Switches
II. Network diagram
GE2/0/1
Device A
Figure 1-6 Digest Snooping configuration
III. Configuration procedure
1) Enable Digest Snooping on Device A
# Enable Digest Snooping on GigabitEthernet2/0/1.
<DeviceA> system-view
[DeviceA] interface GigabitEthernet 2/0/1
[DeviceA-GigabitEthernet2/0/1] stp config-digest-snooping
# Enable global Digest Snooping.
[DeviceA-GigabitEthernet2/0/1] quit
[DeviceA] stp config-digest-snooping
2) Enable Digest Snooping on Device B (the same as above, omitted)

1.7 Configuring No Agreement Check

Two types of messages are used for rapid state transition on designated RSTP and
MSTP ports:
Proposal: sent by designated ports to request rapid transition
Agreement: used to acknowledge rapid transition requests
Both RSTP and MSTP switches can perform rapid transition operation on a designated
port only when the port receives an agreement packet from the downstream switch.
The differences between RSTP and MSTP switches 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.
Third-party
device
GE2/0/1
GE2/0/2
Root port
Designated port
GE2/0/2
Blocked port
GE2/0/2
GE2/0/1
Device B
1-42
Chapter 1 MSTP Configuration