Configuring No Agreement Check - 3Com Switch 4800G 24-Port Configuration Manual

230 C 23: MSTP C
HAPTER
Configuration Example
Configuring No
Agreement Check
ONFIGURATION
You need to enable this feature both globally and on associated ports to make
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it take effect. It is recommended to enable the feature on all associated ports
first and then globally, making all configured ports take effect, and disable the
feature globally to disable it on all associated ports.
It is not recommended to enable Digest Snooping on the MST region edge port
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to avoid loops.
It is recommended to enable Digest Snooping first and then MSTP. Do not
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enable Digest Snooping when the network works well to avoid traffic
interruption.
Network requirements
Device A and Device B connect to a third-party's router and all the routers are in
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the same region.
Enable Digest Snooping on Device A and Device B so that the three routers can
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communicate with one another.
Network diagram
Figure 58 Digest Snooping configuration
Third-party switch
GE 1/0/1
GE1/0/1
GE 1/0 /2
Device A
Configuration procedure
1 Enable Digest Snooping on Device A
# Enable Digest Snooping on GigabitEthernet1/0/1.
<DeviceA> system-view
[DeviceA] interface GigabitEthernet 1/0/1
[DeviceA-GigabitEthernet1/0/1] stp config-digest-snooping
# Enable global Digest Snooping.
[DeviceA-GigabitEthernet1/0/1] quit
[DeviceA] stp config-digest-snooping
2 Enable Digest Snooping on Device B (the same as above, omitted)
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
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Agreement: used to acknowledge rapid transition requests
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Root port
Designated port
GE 1/0 /2
Blocked port
GE1/0/2
GE1/0/1
Device B