9• After you disable the MAC address learning function for an S-channel, the bridge will discardpackets with an unknown source MAC address.• The undo evb mac-learning forbidden command and the mac-address mac-learningenable command must be configured together to avoid communication interruption. For moreinformation about the mac-address mac-learning enable command, see Layer 2—LANSwitching Command References.To disable MAC address learning for an S-channel:Step Command Remarks1. Enter system view. system-view N/A2. Enter interface view.• Enter S-channel interfaceview:interface s-channelinterface-number:channel-id• Enter S-channel aggregateinterface view:interfaceschannel-aggregationinterface-number:channel-idN/A3. Disable MAC addresslearning for the S-channel. evb mac-learning forbiddenBy default, the MAC addresslearning function is enabled foran S-channel.Configuring a VSI interface or VSI aggregateinterfaceCreating a VSI interface or VSI aggregate interfaceIMPORTANT:When the total number of VSI interfaces and VSI aggregate interfaces on the device exceeds 512,make sure the VDP keepalive exponent is larger than the default value. If the exponent is not largerthan the default value, some VSI interfaces or VSI aggregate interfaces might be automaticallydeleted.VSI interfaces or VSI aggregate interfaces are typically created by a VSI manager. You can performthis task to create a VSI interface on an S-channel interface or create a VSI aggregate interface onan S-channel aggregate interface. In addition, you can perform this task to modify the Pre-Associateand Associate properties of a VSI interface or VSI aggregate interface.Removing an S-channel also removes all its VSI interfaces and VSI aggregate interfaces.To create a VSI interface or VSI aggregate interface:Step Command Remarks1. Enter system view. system-view N/A2. Enter S-channel interfaceview or S-channelaggregate interface view.interface { s-channel |schannel-aggregation }interface-number:channel-idN/A3. Create a VSI interface orVSI aggregate interface.evb vsi vsi-local-id { association |pre-association }By default, no VSI interface orVSI aggregate interfaces exist on