Configuration Example - 3Com MSR 50 Series Configuration Manual

476 C 23: MSTP C
HAPTER

Configuration Example

ONFIGURATION
With global Digest Snooping enabled, modification of VLAN-to-instance
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mappings and removing of the current region configuration using the undo
stp region-configuration command are not allowed. You can only modify
the region name and revision level.
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 132 Digest Snooping configuration
Third -party device
Eth 1 /1
Eth 1 /0
Eth 1 / 1
Device A
Configuration procedure
1 Enable Digest Snooping on Device A.
# Enable Digest Snooping on Ethernet 1/0.
<DeviceA> system-view
[DeviceA] interface ethernet 1/0
[DeviceA-Ethernet1/0] stp config-digest-snooping
# Enable global Digest Snooping.
[DeviceA-Ethernet1/0] quit
[DeviceA] stp config-digest-snooping
2 Enable Digest Snooping on Device B (the same as above, omitted).
Root port
Designated port
Eth 1 /0
Blocked port
Eth 1 /1
Eth 1/ 0
Device B