R5 should send a summary route to ITA

R5 should send a summary route to ITA representing all the R5 loopback interfaces.
R5:
router bgp 65002
aggregate-address 172.16.0.0 255.255.240.0 summary-only

R5(config-router)‪#‎do‬ show ip bgp
BGP table version is 18, local router ID is 172.16.12.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incomplete

Network Next Hop Metric LocPrf Weight Path
* 10.1.1.0/24 192.168.34.1 0 65001 i
*> 192.168.14.1 0 0 65001 i
* 10.2.2.0/24 192.168.14.1 0 65001 i
*> 192.168.34.1 0 65001 i
* 10.3.3.0/24 192.168.14.1 0 65001 i
*> 192.168.34.1 0 0 65001 i
* 10.20.0.0/22 192.168.14.1 0 65001 i
*> 192.168.34.1 0 65001 i
s> 172.16.0.0/22 0.0.0.0 0 32768 i
*> 172.16.0.0/20 0.0.0.0 32768 i
s> 172.16.4.0/22 0.0.0.0 0 32768 i
s> 172.16.8.0/22 0.0.0.0 0 32768 i
s> 172.16.12.0/22 0.0.0.0 0 32768 i

Notice in the show ip bgp command on R4 the letter “S” for the four loopback interfaces of R5,the reason is :when adding the summary-only keyword in the aggregate-address command ,the summary-only keyword tells to suppress the advertisement of the subset routes (the four loopback interfaces) ,those routes are noted by the code “S” instead R5 advertises the summary 172.16.0.0/20 which is noted by the code * meaning that this route is valid and finally R2 in ITA networks receives only one route