[c-nsp] Debugging LFI fragmentation

[Oliver Boehmer (oboehmer)]

Leonardo Souza <> wrote on Thursday, August 30, 2007 8:53 PM:

> Correct.
>   I sent ping packets with 1500 bytes .
>   My problem is that on the other side, I see no debug output for MLP
>   (events, fragments etc...). By the way, it´s a C10K.
>   It seems a bug. I dont know...

As the 10k processes the traffic in hardware, I don't think you can see them using these debug commands. 
You could monitor the packet counters on the interfaces involved, i.e. if you send 1000 packets, you should see a 1000 packets on the bundle master, and 1000 packets on each of the bundle members (i.e. 2000 total on the bundle members). This would show you that fragmentation is working. Which PRE are you using? I think the PRE1 doesn't support MLP fragmentation (at least it didn't when I worked with this platform a few years ago).

	oli


> 
>   Regards.
> 
> "Oliver Boehmer (oboehmer)" <oboehmer at cisco.com> escreveu:
>   Leonardo Souza <> wrote on Thursday, August 30, 2007 4:23 PM:
> 
>> Hi mates.
>> Maybe somebody can help me.
>> I configured MLPoATM and LFI.
>> According this debug, can I be sure both the routers are doing
>> fragmentation? 
>> 
>> Router#
>> *Mar 1 18:27:12.420: Vi3 MLP: I frag C0000041 size 49 encsize 2
>> *Mar 1 18:27:12.420: Vi3 MLP: O frag C0000064 size 57 encsize 10
>> *Mar 1 18:27:12.476: Vi3 MLP: I frag C0000042 size 48 encsize 2
>> *Mar 1 18:27:12.564: Vi3 MLP: I frag C0000043 size 49 encsize 2
>> *Mar 1 18:27:12.572: Vi3 MLP: O frag C0000065 size 57 encsize 10
>> *Mar 1 18:27:12.864: Vi3 MLP: I frag C0000044 size 48 encsize 2
>> *Mar 1 18:27:12.960: Vi3 MLP: I frag C0000045 size 50 encsize 2
>> *Mar 1 18:27:12.968: Vi3 MLP: O frag C0000066 size 58 encsize 10
>> 
>> Does "I frag" stand for Input fragmented packet and "O frag" stand
>> for Output fragmented packet?
> 
> well, I frag means "input fragment". Whether this is actually a
> fragment 
> L3 packet cannot be deducted here, I think, any piece of data MLP
> sends 
> is a fragment.
> In general, we don't fragment packets smaller than 84 bytes.
> Send a large ping packet (1000 bytes) and take a look at the debug..
> 
> oli
> 
> 
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