[j-nsp] LDP flaps specifically present on ACX Juniper routers (ACX4000 and ACX1100)

[Aaron]

About snmp...

Is your Management station walking the entire mib tree of your devices ?!

I've experienced over the years that when I management station is NOT tuned
appropriately, it WILL spike the processors of your routers/switches during
the polling cycle, like every 15 minutes or so, whatever it is set to.

I'm not sure this is your problem, but it could be.

Aaron

p.s. it's probably dumb/unnecessary to have a snmp mgmt. station hit all the
OIDs on the network devices.... since you probably don't want/need that much
info queried anyway.



-----Original Message-----
From: juniper-nsp [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of
raf
Sent: Thursday, April 28, 2016 11:03 AM
To: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] LDP flaps specifically present on ACX Juniper routers
(ACX4000 and ACX1100)

Hi,

Is your RE cpu utilisation is OK or not ?

I have similars issues on EX during snmp polling, which are eating all the
cpu time.

-- 

Raphael Mazelier


Le 28/04/2016 à 17:38, joel ahumuza a écrit :
> Hi All,
>
> We are experiencing an issue with ACX routers running on 12.3X54-D20.7 
> where the LDP sessions are continuously flapping, the logs indicate 
> the following;
>
> Apr 21 03:36:31  hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session 
> x.x.x.x is down, reason: hold time expired Apr 21 03:36:34  hostname 
> rpd[2299]: RPD_LDP_NBRDOWN: LDP neighbor x.x.x.x
> (lo0.0) is down
> Apr 21 03:36:38  hostname rpd[2299]: RPD_LDP_NBRDOWN: LDP neighbor 
> x.x.x.x
> (lo0.0) is down
> Apr 21 03:36:38  hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session 
> x.x.x.x is down, reason: all adjacencies down Apr 21 03:55:34  
> hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, 
> reason: received notification from peer Apr 21 03:55:34  hostname 
> rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: 
> received notification from peer Apr 21 03:55:35  hostname rpd[2299]: 
> RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: received 
> notification from peer Apr 21 03:55:35  hostname rpd[2299]: 
> RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: received 
> notification from peer
>
> The physical connections are okay, no flaps or errors on the p2p 
> connections We are running ISIS as the IGP, whose adjacency is stable.
>
> Actions taken from our team was;
> - Increase the hold time setting on the ldp enabled interfaces.
> - Increase the time interval on the same ldp enabled interfaces.
> - setting the ldp session protection setting on the ldp enabled 
> loopback interface.
>
> Unfortunately the actions did not yield much since the flaps have been 
> ongoing.
>
> Anyone have any Idea on what the problem / solution might be?
>

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