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to VOIP, DSCP30 corresponds to VOD. After the downlink port enables flexible QinQ function,
the packets will be packed with different external tags according to DSCP of users. DSCP10
will be packed an external tag 1001 (This tag is unique in public network), enter Broad Band
Network-DSCP10 and classfied to BRAS device. DSCP20 (or DSCP30) will be packed an
external VLAN tag 2001(or 3001) and classfied to SR device according to the flow rules. The
second user can be assigned different DSCPs in DSLAM2. Notice: The assigned DSCP of the
second user may be same with the first user and the DSCP value will be also packed an
external tag. In the above figure, the external tag of the second user is different to the first user
for distinguishing DSLAM location and locating the user finally.
The configuration in the following:
If the data flow of DSLAM1 enters the switch's downlink port1, the configuration is as follows:
Switch(config)#class-map c1
Switch(config-classmap-c1)#match ip dscp 10
Switch(config-classmap-c1)#exit
Switch(config)#class-map c2
Switch(config-classmap-c2)#match ip dscp 20
Switch(config-classmap-c2)#exit
Switch(config)#class-map c3
Switch(config-classmap-c3)#match ip dscp 30
Switch(config-classmap-c3)#exit
Switch(config)#policy-map p1
Switch(config-policymap-p1)#class c1
Switch(config-policymap-p1-class-c1)# set s-vid 1001
Switch(config-policymap-p1)#class c2
Switch(config-policymap-p1-class-c2)# set s-vid 2001
Switch(config-policymap-p1)#class c3
Switch(config-policymap-p1-class-c3)# set s-vid 3001
Switch(config-policymap-p1-class-c3)#exit
Switch(config-policymap-p1)#exit
Switch(config)#interface ethernet 1/1
Switch(config-if-ethernet1/1)#dot1q-tunnel enable
Switch(config-if-ethernet1/1)#service-policy p1 in
If the data flow of DSLAM2 enters the switch's downlink port1, the configuration is as follows:
Switch(config)#class-map c1
Switch(config-classmap-c1)#match ip dscp 10
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Troubleshooting
