internal bgp question

[Denis Samsonov]

Have a situation ..
It is necessary to link two Rout server (internal bgp) by cat6509
approximate scheme: rs1 (vlan1, as1111)-c6509 (as1111) - rs2 (vlan2, as1111)

In this configuration,
protocol bgp c6509 {
          local as 1111;
          neighbor 178.xxx.xx.x as 1111;

error: Only external neighbor can be RS client

how can I get out of this situation and to link both route servers 
internal bgp? without the use of gray AS