Fxp0 - Management Interface Issue

2 alarms currently active
Alarm time Class Description
2013-10-09 02:58:39 IST Major Host 1 fxp0 : Ethernet Link Down
2013-10-09 02:58:39 IST Major Host 0 fxp0 : Ethernet Link Down

>show interfaces fxp0

Physical interface: fxp0, Enabled, Physical link is Down
Interface index: 1, SNMP ifIndex: 1
Type: Ethernet, Link-level type: Ethernet, MTU: 1514, Speed: 10m
Device flags : Present Running No-Carrier
Interface flags: Hardware-Down SNMP-Traps
Link type : Half-Duplex
Current address: 00:a0:a5:63:3d:80, Hardware address: 00:a0:a5:63:3d:80
Last flapped : 2013-10-09 02:53:20 IST (00:17:58 ago)
Input packets : 0
Output packets: 0

> show interfaces fxp0 terse
Interface Admin Link Proto Local Remote
fxp0 up down

** I have cleared the alarm by using:-
# set chassis alarm management-ethernet link-down ignore

Can someone tell me what could be the reason for fxp0's link Proto "down" ?
What steps could i take to troubleshoot the issue.

Some Details:-
Router:- M120
Junos:- 10.4R9.2

How it went down :-
I configured fxp0 unit 0 and assigned it's IP 192.168.1.5/24. Uploaded a file then i deleted fxp0 unit 0

Command used:-
# delete interface fxp0 unit 0

after that link proto for fxp0 went down.

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Comments

networker050184

First off is anything connected?

llllvllll

Nope nothing is connected with fxp0.

networker050184

If nothing is connected that is why it is down. You can disable the interface if you aren't using it.

llllvllll

Yes ok i know that layer 2 proto is down because nothing is connected to it , but i m confused that why was it up before i made unit 0 ? i mean no cables were connected before.
Is there any reason that fxp0 was UP/UP(without cable) before i made fxp0 unit 0.