Thank you for your response. Yes, its 4. Commit complete, but it simply not working. I tried it as ae0 and ae3.
admin@juniper# run show interfaces ae3
Physical interface: ae3, Enabled, Physical link is Down
Interface index: 191, SNMP ifIndex: 666
Link-level type: Flexible-Ethernet, MTU: 1518, Speed: Unspecified, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
Flow control: Disabled, Minimum links needed: 1, Minimum bandwidth needed: 0
Device flags : Present Running
Interface flags: Hardware-Down SNMP-Traps Internal: 0x0
Current address: 5c:5e:ab:01:55:c3, Hardware address: 5c:5e:ab:01:55:c3
Last flapped : 2013-04-23 20:30:06 EEST (01:05:30 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)