Forwarding issues related to MACs starting with a 4 or a 6 (Was: [c-nsp] Wierd MPLS/VPLS issue)

Christopher Morrow morrowc.lists at gmail.com
Fri Dec 2 16:08:56 UTC 2016


On Fri, Dec 2, 2016 at 11:07 AM, Christopher Morrow <morrowc.lists at gmail.com
> wrote:

>
>
> On Fri, Dec 2, 2016 at 11:02 AM, Simon Lockhart <simon at slimey.org> wrote:
>
>> On Fri Dec 02, 2016 at 10:29:56AM -0500, Christopher Morrow wrote:
>>
>> 2^(8*9216) is quite a lot of different packets to test through the
>> forwarding
>> path... But, wait, that assumes every bit combination for 9216 byte
>> packets,
>> but the packet might be shorter than that... So multiply that by
>> (9216-64).
>>
>>
> but  most/all forwarding asics (aside from perhaps extreme's?) only deal
> with the first N bits in the header (128 or so..) so... not quite as many
> right?
>
>
>
and REALLY they could have just started ~9 yrs ago: "Hey, maybe this 4/6
thing is really a problem? how about we add 2 other things to our testing
framework?"

instead of: "High Five! First to market!"


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