Ethernet Switching
Reply
New User
sulbig
Posts: 2
Registered: ‎01-04-2010
0

SFP power causing Sonet Interface to drop

I'm receiving the following alarms in my router:

 

Jan  4 03:11:19   cfeb DFPGA(0/0) link 0 SFP receive power low  alarm set
Jan  4 03:11:19   cfeb DFPGA(0/0) link 0 SFP receive power low  warning set
Jan  4 03:11:22   cfeb so-0/0/0 rx loss of sync, DPA reset is forced.
Jan  4 03:11:29   cfeb DFPGA(0/0) link 0 SFP receive power low  alarm cleared
Jan  4 03:11:29   cfeb DFPGA(0/0) link 0 SFP receive power low  warning cleared
Jan  4 03:12:09   cfeb DFPGA(0/0) link 0 SFP receive power low  warning set
Jan  4 03:12:15  cfeb DFPGA(0/0) link 0 SFP receive power low  alarm set
Jan  4 03:12:33   cfeb DFPGA(0/0) link 0 SFP receive power low  alarm cleared
Jan  4 03:12:42   cfeb DFPGA(0/0) link 0 SFP receive power low  warning cleared
Jan  4 03:13:56   cfeb DFPGA(0/0) link 0 SFP receive power low  warning set
Jan  4 03:14:02   cfeb DFPGA(0/0) link 0 SFP receive power low  alarm set
Jan  4 03:14:02   cfeb DFPGA(0/0) link 0 SFP syslog throttling: disabling syslogs for receive power alarms and warnings
Jan  4 03:16:27  cfeb so-0/0/0 rx loss of sync, DPA reset is forced.

 

As you can see, it seems like the low power alarms are causing the sonet interface to go down.  Has anyone run into this before, and found the cause for it?  So far, Juniper has only had us try replacing the SFP (and that has taken 6 weeks!)  Any ideas for what to try next?

 

Thanks!

Trusted Contributor
wsanders
Posts: 88
Registered: ‎08-10-2009
0

Re: SFP power causing Sonet Interface to drop

Replace the SFP on the other end. Or check your physical link power level and quality.

 

"Low power" means the light in the fiber is dim. You would expect the link to go down if the light is too dim.

 

W Sanders
System and Network Administrator
St Marys College of California
New User
sulbig
Posts: 2
Registered: ‎01-04-2010
0

Re: SFP power causing Sonet Interface to drop

So, if this thing is brought in by a long haul service provider, then we should have them come out and check the light levels going into the router?  We don't own their router which probably 2 states away, so we can't swap out their SFP.

Regular Visitor
SpaceCadet
Posts: 1
Registered: ‎10-09-2009
0

Re: SFP power causing Sonet Interface to drop

Verify anything 'you' own (Customer Owned And Maintained) is operating, including any fiber that is not the service providers. If your equipment and infrastructure is good, sounds like you need to call a trouble in with your provider so they can verify levels at the demarcation and take corrective action if necessary. It looks as though you've replaced the SFP and you are experiencing the same issue.

 

jph

Copyright© 1999-2013 Juniper Networks, Inc. All rights reserved.