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

[james list]

Dear Adam
Very interesting.

So you suggest to use OAM LFM to detect pkt loss and to put down physical
interface, then to use hold-time to wait the storm is gone and put again up
the interface after some secs/mins.

I'm not so familiar with OAM, how does it works on a metro ethernet link
provided by the carrier? Is it end to end or is stopped at the ME carrier
switch?

Cheers
James
Il 20/Ott/2015 17:35, "Adam Vitkovsky" <Adam.Vitkovsky at gamma.co.uk> ha
scritto:

> Dear James,
>
> You can use LFM to detect errors on the link
>
> Edit protocols oam
> ethernet {
>     link-fault-management {
>         action-profile detect-loss {
>             event {
>                 link-adjacency-loss;
>                 protocol-down;
>             }
>             action {
>                     syslog;
>                     link-down;
>                     send-critical-event;
>             }
>         }
>         interface ge-x/x/x {
>             apply-action-profile detect-loss
>             pdu-interval 50;
>             pdu-threshold 3;
>
>
> however there's no hold-time on LFM to test the link for say 10sec in
> order to render it usable again so you might need interface hold down
> timers for stability
>
> set int ge0/0/0/ hold-time up 10000 down 0
>
>
> adam
> >
>
>         Adam Vitkovsky
>         IP Engineer
>
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> E:      Adam.Vitkovsky at gamma.co.uk
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> -----Original Message-----
> > From: juniper-nsp [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf
> > Of james list
> > Sent: Monday, October 19, 2015 3:34 PM
> > To: juniper-nsp at puck.nether.net
> > Subject: [j-nsp] Link with errors, how to fast detect ?
> >
> > 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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