3com S7906E Instruccion De Instalación

 

1-31 

Before enabling digest snooping, ensure that associated devices of different vendors are 
interconnected and run MSTP. 

 

You can enable Digest Snooping only on a device that is connected to a third-party device that uses its 
private key to calculate the configuration digest. 

Follow these steps to configure Digest Snooping: 

Enter system view 

— 

Enter Ethernet 
interface view, or 
Layer 2 aggregate 
interface view 

interface interface-type 
interface-number

 

Enter interface 
view or port 
group view 

Enter port group 
view 

port-group manual 
port-group-name 

Required 
Use either command. 

Enable digest snooping on the 
interface or port group 

Required 
Not enabled by default 

Return to system view 

— 

Enable global digest snooping 

Required 
Not enabled by default 

 

z

 

With the Digest Snooping feature enabled, comparison of configuration digest is not needed for 
in-the-same-region check, so the VLAN-to-instance mappings must be the same on associated 
ports. 

z

 

With global Digest Snooping enabled, modification of VLAN-to-instance 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. 

z

 

You need to enable this feature both globally and on associated ports to make it take effect. It is 
recommended to enable the feature on all associated ports first and then globally, thus making the 
configuration take effect on all configured ports and reducing impact on the network, and disable 
the feature globally to disable it on all associated ports.  

z

 

You are recommended not to enable Digest Snooping on MST region edge ports, thus avoiding 
loops. 

z

 

You are recommended to enable Digest Snooping first and then MSTP. Do not configure Digest 
Snooping when the network works well, thus avoiding traffic interruption.