[j-nsp] Multicast flow with "Wrong incoming interface notifications" counter incrementing

[david.roy at orange.com]

Could you send us the traces of "show multicast stat" 2 times separated with 10 sec. 

Thank you 
 


 
David Roy 
IP/MPLS Support engineer - Orange France
Ph. +33 2 99 87 64 72 - Mob. +33 6 85 52 22 13
david.roy at orange.com
 
JNCIE-M&T/SP #703 - JNCIE-ENT #305 - JNCIP-SEC

-----Message d'origine-----
De : juniper-nsp-bounces at puck.nether.net [mailto:juniper-nsp-bounces at puck.nether.net] De la part de Riccardo S
Envoyé : mardi 15 janvier 2013 09:14
À : nkhambal at juniper.net
Cc : juniper-nsp at puck.nether.net
Objet : Re: [j-nsp] Multicast flow with "Wrong incoming interface notifications" counter incrementing


Having also a look to Juniper documentation says:

Wrong incoming interface notifications = Number of times that the upstream interface was not available

It doesn't sound as an RPF fail counter, isn't it ?

Tks

> From: nkhambal at juniper.net
> To: dim0sal at hotmail.com
> CC: juniper-nsp at puck.nether.net
> Subject: Re: [j-nsp] Multicast flow with "Wrong incoming interface 
> notifications" counter incrementing
> Date: Mon, 14 Jan 2013 17:14:42 +0000
> 
> Iif mismatch means the multicast traffic received for this (S,G) has a different incoming interface than the one we programmed in the PFE (based on RPF check). 
> 
> Traffic would get discarded in this case and not forwarded. However, a 
> notification is sent to RPD/PIM on the RE to check if the we need to 
> change the iif on this (S,G) to a new iif (for e.g. if this leads to 
> RPT to SPT cutover or if there is a change in the iif due to RPF 
> interface change)
> 
> If the counter increase consistently, then most likely you are not forwarding on that (S,G) if 100% of the incoming traffic on this (S,G) get discarded with iif mismatch. Alternately, you might be getting same (S,G) traffic on 2 different iifs and in this case one coming over correct iif gets forwarded and one over wrong iif gets discarded with iif mismatch counted against that (S,G).
> 
> Thanks,
> Nilesh. 
> 
> --------------------------------
> Sent from my mobile device
> 
> On Jan 14, 2013, at 8:14 AM, "Riccardo S" <dim0sal at hotmail.com> wrote:
> 
> > 
> > 
> > 
> > Hi
> > 
> > What does means incrementing counter "Wrong incoming interface 
> > notifications" in the following command ?
> > 
> > Is the following flow forwarded, as expected, towards the receiver ?
> > 
> > 
> > 
> > 
> > 
> > # run show multicast route group
> > 224.12.22.1 extensive    
> > 
> > Instance: master Family: INET
> > 
> > 
> > 
> > Group: 224.12.22.1
> > 
> > 
> > Source: 1.1.1.1/32
> > 
> > 
> > Upstream interface: vlan.1
> > 
> > 
> > Downstream interface list: 
> > 
> >        vlan.100
> > 
> > 
> > Session description: Unknown
> > 
> > 
> > Statistics: 3 kBps, 30 pps, 43340 packets
> > 
> > 
> > Next-hop ID: 131071
> > 
> > 
> > Upstream protocol: PIM
> > 
> > 
> > Route state: Active
> > 
> > 
> > Forwarding state: Forwarding
> > 
> > 
> > Cache lifetime/timeout: 360 seconds
> > 
> > 
> > Wrong incoming interface notifications: 6960
> > 
> > 
> > Uptime: 00:36:36
> > 
> > 
> > 
> > After 10 seconds:
> > 
> > 
> > 
> > # run show multicast route group
> > 224.12.22.1 extensive    
> > 
> > Instance: master Family: INET
> > 
> > 
> > 
> > Group: 224.12.22.1
> > 
> > 
> > Source: 1.1.1.1/32
> > 
> > 
> > Upstream interface: vlan.1
> > 
> > 
> > Downstream interface list: 
> > 
> >        vlan.100
> > 
> > 
> > Session description: Unknown
> > 
> > 
> > Statistics: 2 kBps, 30 pps, 43491 packets
> > 
> > 
> > Next-hop ID: 131071
> > 
> > 
> > Upstream protocol: PIM
> > 
> > 
> > Route state: Active
> > 
> > 
> > Forwarding state: Forwarding
> > 
> > 
> > Cache lifetime/timeout: 360 seconds
> > 
> > 
> > Wrong incoming interface notifications: 6974
> > 
> > 
> > Uptime: 00:36:41
> > Tks
> > 
> > 
> >                         
> > _______________________________________________
> > juniper-nsp mailing list juniper-nsp at puck.nether.net 
> > https://puck.nether.net/mailman/listinfo/juniper-nsp
> > 
> 
 		 	   		  
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