[j-nsp] Idle bgpBackwardTransition traps when establishing a bGP session

[Antoine Musso]

Hello,

I am currently trying to monitor a BGP session using SNMP traps (SNMP 
polling is NOT an option). We are using Juniper 4350 with JunOS 8.3R2.8.

If the layer 2 link goes down, the BGP session goes down too and the 
protocol will keep trying to reconnect. The Juniper does send 
bgpBackwardTransition traps indicating the current status (idle, connected).

When the session goes up, the Juniper send us a bgpBackwardTransition 
trap with the Idle status, and some milliseconds after, a bgpEstablished 
trap (see below for a commented tcpdump capture).

In my network management system, the BGP idle state is considered a 
problem and bgpEstablished its resolution. The system require that the 
resolution happen *strictly* after the problem. Given that traps are 
received in the same second, the alarm is never "cleared".

So, I am wondering why the JunOS send an Idle trap just before the 
session is established. It looks wrong to me since the session is not 
idle but almost established :o)

Has anyone ever had a similar issue with its network management system ?

---------------------------------------------------------------
     Commented tcpdump capture showing BGP traps
---------------------------------------------------------------

17:03:44.708075 IP jrouter.2810 > networkmanager.162:  C=XX V2Trap(126)
Uptime
         .1.3.6.1.2.1.1.3.0=261631105
bgpBackwardTransition
         .1.3.6.1.6.3.1.1.4.1.0=.1.3.6.1.2.1.15.7.2
bgpPeerLastError
         .1.3.6.1.2.1.15.3.1.14.a.b.c.d=00_00
bgpPeerState : 1 = idle
         .1.3.6.1.2.1.15.3.1.2.a.b.c.d=1
         .1.3.6.1.6.3.1.1.4.3.0=.1.3.6.1.4.1.2636.1.1.1.2.19

17:03:44.719600 IP jrouter.2810 > networkmanager.162:  C=XX V2Trap(126)
Uptime
         .1.3.6.1.2.1.1.3.0=261631108
bgpEstablished
         .1.3.6.1.6.3.1.1.4.1.0=.1.3.6.1.2.1.15.7.1
bgpPeerLastError
         .1.3.6.1.2.1.15.3.1.14.a.b.c.d=00_00
bgpPeerState : 6 = established
         .1.3.6.1.2.1.15.3.1.2.a.b.c.d=6
         .1.3.6.1.6.3.1.1.4.3.0=.1.3.6.1.4.1.2636.1.1.1.2.19
---------------------------------------------------------------

cheers,

-- 
Antoine MUSSO
DISIT/PROD/QFO/OUT
mailto:antoine.musso at laposte.fr
tél. 02 40 12 73 62
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