slow-path/fast-path traffic

[Alexandr_P]

Hello!

Am I right? Or if not - please correct me.

Slow-path forwarded traffic - which processed with ASICs
Fast-path forwarded traffic - which rocesses with CPU

Thank you!

[Stephane_Grosj1]

I'm not sure of how to capture that info. You certainly could tcpdump that traffic, being careful with the tool as the CPU is already forwarding traffic and so must be stressed. Maybe some debug commands exist, but I don't know them off the top of my head. Maybe people from our GTAC can help here.

[M_Nees]

Hi Stephane,

is there no command which exactly tell me if slow-path traffic occur ?

What can i do if i see "show ipstats" forward counter increases - how can i see which traffic occurs this ?

Regards

[Alexandr_P]

Hello, MAtthias!

You can take a capture of CPU's slow-path traffic and analize it with Wireshark.
Some like - #debug packet capture on interface Broadcom....

Thank you!

[Stephane_Grosj1]

"sh ipstats" is the command to look at potential slow-path traffic. You need to look at the "Forward" counter. Issue the command several times to see if the counter increases.

show ipstats | inc Forward