[j-nsp] L3 incompletes

[Pekka Savola]

On Fri, 13 Jun 2008, Lakshminarayanan P wrote:
>>> No, that should result in "policed discards", not "L3 incompletes".
>>> This commonly shows up when the neighbor is from Brand-C and has
>>> cdp enabled.  :)
>
> Well, I have come across increase in L3 incomplete errors previously when
> testing with a M320 connected back to back on Ethernet to another router. On
> the other end of the interface, I had LDP / OSPF enabled while it was
> disabled on the M320 end of the interface. I did see L3 incompletes increase
> consistently which disappeared once I  disabled LDP / OSPF on the other end
> also.
>
> If I remember correctly, the other end was connected to a M40e :)

Note that some Ethernet interfaces behave differently with this 
regard, I think this depends on whether the Ethernet PIC operates in 
cut-through mode or not.

Since 9.0, there has been a "ignore-l3-incompletes" toggle under 
fast/gigether-options where you can disable the l3 incomplete 
incrementing completely.  Unfortunately it's not possible to tell 
apart real incomplete frames from incorrectly reported ones so it's 
all or nothing.

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings