[c-nsp] Cisco Processing Regarding ICMP

[Paul Cosgrove]

Hi Alaerte,

This will be dependent on the hardware, traffic types, throughput and 
software version/configuration.   You may need to explain a little more 
in order to get an adequate answer to your question. 

Large numbers of packets from a handful of hosts running PMTUD may 
require a smaller number of ICMP notifications than would be necessary 
for a larger number of hosts sending less traffic.  The difference in 
the MTUs, and the sizes of the incoming packets will also affect the 
proportion of traffic which triggers notifications.  Similarly protocols 
running on the router itself may require their packets to be fragmented.

Paul.

alaerte.vidali at nsn.com wrote:
>  Hi,
>
> Any document about how is the processing of a packet received on
> interface A toward interface B, where interface B has lower MTU than
> received packet and DF bit is set?
>
> (like description of the process)
>
> (considering CPU impact and if default limitation of ICMP generation
> enough when the number of packets is very high)
>
> Thanks,
> Alaerte
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