3com S7906E Manuel De Montage

 

1-11 

 

Exit to system view 

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z 

To guard against attacks, you are recommended to enable ARP detection on each CVLAN.  

z 

Before applying a QoS policy to the downlink port, enable customer-side QinQ on the port; before 

disabling customer-side QinQ on the downlink port, remove the QoS policy.  

z 

To change a VLAN mapping, you must first use the reset dhcp-snooping command to clear the 

corresponding DHCP snooping address binding entry (refer to DHCP Commands in the IP 

Services Volume) or disable the dynamic address binding function of IP Source Guard on the 

downlink port and then enable dynamic address binding again (refer to IP Source Guard 

Commands in the Security Volume).  

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When configuring many-to-one VLAN mapping, you cannot create VLAN interfaces for the involved 

SVLANs and CVLANs on the switch.  

 

Perform one-to-two VLAN mapping on the edge devices from which customer traffic enters SP 

networks, on Device A and Device D in 

 for example.  

Follow these steps to configure a one-to-two VLAN mapping: 

Enter system view 

system-view 

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Configure an uplink policy for 
the downlink port to tag CVLAN 
tagged frames with an SVLAN 

. Required 

Enter the interface view of the 
downlink port 

interface interface-type 
interface-number 

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Set the link type of the downlink 
port to hybrid 

port link-type hybrid 

Required 

Configure the downlink port to 
permit the specified SVLANs to 
pass through and forward 
frames after removing the outer 
SVLAN tag 

port hybrid vlan vlan-id-list 
untagged 

Required 

By default, a hybrid port permits 
only VLAN 1 to pass through.  

Enable basic QinQ on the port 

Required 

Apply the uplink policy to the 
downlink port in the inbound 
direction 

qos apply policy policy-name 
inbound 

Required 

Exit to system view 

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Enter the interface view of the 
uplink port 

interface interface-type 
interface-number 

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