[j-nsp] Failure detection on Ge interfaces

[Filippo Cugini]

Josef,
we measured the loss of light spilling part of the signal and using an 
external photodiode. At the same time we collected the snmp messages sent by 
the router (and also polling with the XML Junoscript) referring to the 
operative status (up/down) of the GE interface.  Results show that M10 
(Junos 7.1) checks the operative status of the GE interface once a second. 
The measured delay has been confirmed evaluating the performance of the mpls 
recovery solutions.
I can send you a more detailed document if you want.
Thank you for your effort
   Filippo





----- Original Message ----- 
From: "Josef Buchsteiner" <josefb at juniper.net>
To: "Filippo Cugini" <filippo.cugini at cnit.it>
Cc: <juniper-nsp at puck.nether.net>
Sent: Tuesday, October 04, 2005 2:37 PM
Subject: Re: [j-nsp] Failure detection on Ge interfaces


>    Filippo,
>
>             [ last question I promise]
>
>             Can   you   illustrate   to  me  how  you  performed  the
>             check/measurement that the link down is not interrupt
>             driven?
>
>             The reason I'm interested in this one is that we recently
>             fixed a problem on the 1 or 2port GE SFP PIC or the IQ GE
>             PIC where the link down event was done in polling cycles
>             which has been fixed in PR62682 and is available in
>             versions 7.3R3 7.2R3 7.3R2 7.1R4 and higher.
>
>
>
>            thanks
>            josef
>
> Monday, October 3, 2005, 5:25:28 PM, you wrote:
> FC>
> FC>
> FC> Josef,
> FC>  we have PE-1GE-LX-B cards (1 port Gigabit Ethernet PIC, LX Optics 
> (1310nm,
> FC>  single mode fiber) with PIC ejector)
> FC>  Thanx
> FC>  Filippo
> FC>
> FC>
> FC>
> FC>  ----- Original Message -----
> FC>  From: "Josef Buchsteiner" <josefb at juniper.net>
> FC>  To: "Filippo Cugini" <filippo.cugini at cnit.it>
> FC>  Cc: <juniper-nsp at puck.nether.net>
> FC>  Sent: Monday, October 03, 2005 4:57 PM
> FC>  Subject: Re: [j-nsp] Failure detection on Ge interfaces
> FC>
> FC>
> >> Filippo,
> >> is the a PIC with SFP connectors ?
> >> thanks
> >> Josef
> >>
> >> Monday, October 3, 2005, 2:38:24 PM, you wrote:
> >>
> >> FC>
> >> FC>
> >> FC> Hi all,
> >> FC> we have M10 with GE LX optical interfaces running ospf and mpls
> >> (junos 7.1).
> >> FC> We evaluated the M10 behavior in case of failure (fiber cut)
> >> FC> We have noticed that routers check the operative status of the GE
> >> interface
> >> FC> once a second, thus determining a significant failure detection 
> >> time
> >> (from
> >> FC> 0,1 to 1 sec).
> >> FC> Is it possible to force the router to check the status more
> >> frequently?
> >> FC> Thanx in advance
> >> FC> Filippo
> FC>
> FC>
> FC>
>
>