[j-nsp] RFC2544 on Juniper MX960 10G ports

[Saku Ytti]

On (2010-03-14 10:55 -0700), Jonathan Lassoff wrote:
 
> Isn't the minimum Ethernet frame size 64 bytes? I think Ethernet II /
> Ethernet 802.3 requires this.

Correct. 

L1 = 84bytes (preamble, SFD, MAC, type/len, payload, crc, IFG)
L2 = 64bytes (MAC, type/len, payload, crc)

Payload minimum is 46B, IP packet can be smaller, if so, ethernet will pad
the frame to 46B. Interestingly enough in ethernetII this means ethernet
does not guarantee data integrity for small packets, but obviously IP at L3
will know the packet length and can discard L2 padding.

But IIRC L2 is not included in jcells at all. So you'd get most impact with
least work by sending 65bytes IP packet.

-- 
  ++ytti