[j-nsp] L3 incompletes error in gigaethernet interface

[Dario]

It could be, I'll check it.

Many thanks,

	Dario D.

> One thing that can cause L3 incomplete messages is if an interface is
> receiving multicast packets without multicast reception being enabled by
> either having PIM on the Interface, or using the hidden "routing-options
> multicast interface xxx enable' option.
> 
> Could this be the cause?
> 
> Michael
> 
> 
> 
> > -----Original Message-----
> > From: juniper-nsp-bounces at puck.nether.net 
> > [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Dario
> > Sent: 11 October 2006 17:01
> > To: juniper-nsp at puck.nether.net
> > Subject: [j-nsp] L3 incompletes error in gigaethernet interface
> > 
> > 
> > Dear all,
> > 
> > I've found an interface that has a lot of L3 incompletes errors.
> > 
> > This is the information I've found:
> > 
> > 	L3 incompletes: This counter is incremented when the 
> > incoming packet fails Layer 3 (usually IPv4) sanity checks 
> > 	of the header. For example, a frame with less than 20 
> > bytes of available IP header would be discarded and this 
> > 	counter would be incremented.
> > 
> > 	L3 incomplete means that the datagram received by layer 
> > 2 does not have enough data to match the l3 header. 
> > 	For example, if you get a 64-byte Ethernet packet where 
> > the IP header says length is 200 bytes, that's L3 
> > 	Incomplete. Most frequently seen in ATM where a missed 
> > cell causes a short packet;  usually but not always the
> > 	AAL5 CRC will catch it...
> > 
> > Does anyone know how juniper router is doing L3 sanity checks 
> > of IP header? When only L3 incompletes errors are incremented 
> > on Juniper routers, what will be the cause? Is critical? Is 
> > there any thereshold (errors/seg) to be aware of?
> > 
> > Best regards and thanks in advance,
> > 
> > 	Dario D.
> > 	NOC RedIRIS
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> > 
> 
>