I have outgrown a single rb1100 with PCC. What I mean is that I have more than 12 lines (13 ports on 1100, one used for UPLINK.) What I have done, which might be correct or not (therefor the post), is use QinQ vlan, and link up more 1100's, with a bridged ether and corresponding vlan on the other side where my DSL router connects.
We have several connections issues where, Youtube for example would just stop in the middle and die. You can sortof revive it by just moving the slide, possibly starting a new connection. But it is very intermittent.
I have played extensively with all scenarios of the PCC, (both-addr, src-addr,etc), but I can't seem to get this sorted. If I mangle a client over one DSL connection, using the VLAN, it buffers and plays fine.
Dire straits here, would appreciate any help. I can post the export, but as you know with PCC, its MASSIVE.
Let me know on your solution if you run PCC in excess of L2 connections.