Description: 
This MIB is used to configure end-user line mirroring in the IP DSLAM.

When upstream and downstream traffic mirroring is enabled, all traffic from
an end-user line is replicated, tagged with an operator specified VLAN
tag and sent on the IP DSLAM's uplink interface, as illustrated below.

                         IP DSLAM
            _____________________________________
           |                                     |
           |         Service VLAN                |
           | -------------------------->-------->|----------> End-user
   uplink  |/                            )       |
 <-------->|                            /        |
           |\   Downstream Mirror VLAN /         |
           | \<------------------------          |
           |_____________________________________|


                         IP DSLAM
            _____________________________________
           |                                     |
           |         Service VLAN                |
           | <-----------------------------<-----|<---------- End-user
   uplink  |/                            /       |
 <-------->|                            /        |
           |\     Upstream Mirror VLAN /         |
           | \<------------------------          |
           |_____________________________________|

Different VLANs can be used for upstream and downstream traffic mirroring,
but the same VLAN may be used for both traffic directions. It is also
possible to only mirror traffic in one direction, or to start mirroring on
more than one line.

The traffic mirroring function will not interfere with the normal services
as long as the VLAN used for traffic mirroring is not used for services.
If a mirror VLAN collides with a service VLAN, the behavior is undefined.