Excerpts from Serge Vautour's message of Thu Feb 18 16:28:44 -0800 2010: > Hello, > > We recently used a traffic generator to run RFC2544 tests against a Juniper > MX960. The 1G ports work flawlessly. 0% packet loss at all frame sizes. > > The 10G ports (4x10G "R" card) didn't do as well. They dropped up to 25% > packets with certain small frames (ex: 70 byte frames). The packet loss goes > away almost completely for frames larger than 100 bytes. Our SE tells us this > is normal and is due to how the MX chops the frames up into 64 byte cells > inside the PFE. The 4x10G cards have 4 separate PFEs (1 per 10G port) and > each of them has 10G of bandwidth. 10G of small frames essentially creates > more than 10G of traffic inside the PFE. That explanation may not be 100% > correct but I think it paints the right picture. > > Now the questions. Is this a problem on production networks with real world > traffic? What about on VPN networks with alot of small frames like VoIP? Has > anyone seen this problem creep it's head in production?
Isn't the minimum Ethernet frame size 64 bytes? I think Ethernet II / Ethernet 802.3 requires this. Wouldn't this make the problem moot if you're just running Ethernet? Might be a problem with small ATM cells? Cheers, jof _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
