link in SP track but maybe should be here, anyway
is there a benefit and disadvantages to importing its own RT back to CE?
like in dual-home settup with R1 and R2 as CE in AS X;
Ra and Rb as PE in SP area; R1 links with Ra and R2 with Rb.
PE routers Ra and Rb have same RD and exporting RT a:a and importing back RT a:a. Do we really need import a:a?
What if change RD of Ra and b to be different?