Based on the E. coli system of nomenclature, the V1-V9 region is only 1500 bp length. So, you can amplify the whole region with only one primer pair: usually 27F-1492R.
You can find details at the ProbaBase (http://probebase.csb.univie.ac.at/pb_results/listprimer/0) and in this paper (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2562909/#SD4).