[c-nsp] Route Target Export Propagation Time

[Richard Clayton]

scenario

On a single PE with two VRF's, I create a RT export on VRF A and a RT
import on VRF B, VRF A has some prefixes to export which appear in VRF B
after approx 20 seconds, what process dictates the 20 seconds and is it
configurable.

Thanks
Sledge