QTech QSW-2800 series Configuration Manual - 21.3 Flexible Qinq Example
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166
port.
4. Show flexible QinQ policy-map bound to port
Command
Explanation
Admin mode
show mls qos {interface [
Show flexible QinQ configuration on the
port.
21.3 Flexible QinQ Example
Insert Metropolitan Area
Network Platform
Metropolitan Area
Core Network
DSLAM1
DSLAM2
BRAS
SR
Broad Band
VOIP
Video order programme
DSCP
DSCP
DSCP
10
20
30
1001
2001
3001
1001
2001
3001
TAG
TAG
TAG
TAG
TAG
TAG
DSCP
DSCP
DSCP
10
20
30
DSCP
DSCP
DSCP
10
20
30
DSCP
DSCP
DSCP
10
20
30
Flexible QinQ application topology
As shown in the figure, the first user is assigned three DSCPs that the values are 10, 20, 30
respectively in DSLAM1. DSCP10 corresponds to Broad Band Network, DSCP20 corresponds
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.