From the VPN interface on Router PE2 (VPN2), ping the loopback interface, 10.255.10.5, on Router CE2:
user@vpn2> ping 10.255.10.5 interface
t3-0/0/3.0 local 192.168.193.2 count 3
PING 10.255.10.5 (10.255.10.5): 56 data bytes 64 bytes from 10.255.10.5: icmp_seq=0 ttl=255 time=0.914 ms 64 bytes from 10.255.10.5: icmp_seq=1 ttl=255 time=0.888 ms 64 bytes from 10.255.10.5: icmp_seq=2 ttl=255 time=1.066 ms --- 10.255.10.5 ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.888/0.956/1.066/0.079 ms