[j-nsp] Link with errors, how to fast detect ?

Alexander Arseniev arseniev at btinternet.com
Mon Oct 19 11:24:54 EDT 2015

Not sure what exactly You are trying to achieve, looks like You want to 
delay announcing this link into OSPF (and by extension, using it for 
transit traffic) unless it has been stable for 3 secs.
You could achieve this by defaulting this link to broadcast (if it is 
currently configured as"interface-type p2p") - there is a Waiting state 
equal to Dead timer once the OSPF interface comes up. And it interface 
flaps during this time, Waiting timer starts again.

On 19/10/2015 15:33, james list wrote:
> Dear experts,
> I currently have a wan link between two MXs that sometimes is experiencing
> errors.
> I’ve on top of the link OSPF (timer 1/3)  as routing protocol and I’d like
> to find out any possible way to exclude the link when errors are in place
> and below to the 3 seconds of the OSPF timers.
> I’ve analyzed the following:
> 1)      BFD  with OSPF  but it doesn’t support hold-time (as BGP does), in
> order to avoid OSPF flapping and generate higher instability I cannot use it
> 2)      RPM event based script: probe interval is currently not below of 1
> second, hence to detect results with no false positive I need some sampling
> and we’re still at 3 seconds or more
> Any other possible options ?
> OAM ? does it support hold-time ?
> Cheers
> James
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