re: Riverstone Fuels 10GigE Price WarWhat is the OPEX cost to keep the XGS up and running? Or perhaps that is not important anymore?? You pay now or you pay later... How many times will you have to upgrade the code etc, etc. Riverstone are worse than Cisco about breaking or I mean fixing things in there code releases.
re: Riverstone Fuels 10GigE Price WarI don't fully understand how the vendor claims of Gbps and pps line up.
My understanding was that the Inter-Packet Gap in 10GbE (including the true IPG plus other filler) was 14 bytes. Assuming a minimum packet size of 64 bytes then means that true packet arrival rate is 78 bytes:
pps = 10e9/(78*8) = 16.03 Mpps per 10 Gbps channel
So, how can 160 Gbps line up with 200 Mpps? And 320 Gbps with 400 Mpps?
My cynical nature is leading me, reluctantly, to assume that there is some bogus specmanship going on - but of course I know that can't be true :-)
re: Riverstone Fuels 10GigE Price WarThis is actually pretty funny. Riverstone, Extreme, you shouldn't try to play Cisco's market delay games. You don't know how and it's so transparent. Translation: "please 3com, buy me!" I really have a 10G product. No really!"
Notice Foundry's silence. They're waiting until they have something to show their customers because, guess what? The reason their customers are their customers is because they've seen through the Cisco lies for the last 10 years and have decided to go a different direction. Foundry knows not to play games with customers and their results are showing. Extreme forgot this basic rule so you'll see them continue to flail.
Cisco's souped up 65K will not see a live network until October. FACT.
re: Riverstone Fuels 10GigE Price WarSo, how can 160 Gbps line up with 200 Mpps? And 320 Gbps with 400 Mpps?
A wire-speed 10GigE port should be able to forward 64B packets at around 15Mpps. A box with 16 10GigE ports needs at least 240Mpps forwarding capacity. It is possible that these new Riverstone boxes have more than 15Mpps forwarding capacity per line card and maybe they are planning to introduce non-wirespeed line cards with higher 10G port count in the future.
re: Riverstone Fuels 10GigE Price WarRiverstone is advertising the discounted price in their press release and on their website. The same is true of Force10. Foundry, Cisco and Extreme only talk about list prices, so I discounted those prices 30% to make them more consistent with Riverstone and Force10.
re: Riverstone Fuels 10GigE Price WarHow to calculate PPS for Ethernet:
Preamble = 8-bytes (7 for sync and 1 start of frame delimiter (SFD)) Minimum Packet = 64-bytes >= 6-byte Source MAC address >= 6-byte Destination MAC address >= 2-byte Protocol type/length >= 48-byte Data (data is padded to a min of 48) >= 4-byte CRC Inter-Packet Gap = 12-bytes (IPG)
So, a "64-byte minimum packet" is really 84-bytes of frame. This gives us:
84-bytes * 8-bits = 672-bits per frame
and
10,000,000 bits/sec / 672 = 14,880.952 frames/sec for 10Mbit Ethernet.
Just multiply by the appropriate factor of 10 for the other Ethernet speeds. So, for 10GE, you get 14,880,952 packets/sec, or about 15M as others have pointed out.
For maximal sized frames (non-jumbo), the data field is 1500-bytes, so you get a frame of 1538-bytes, or 12,304-bits. Thus,
10,000,000 / 12,304 = 812.744 frames/second for 10Mb... or 812,744 frames/sec for 10GE.
Or perhaps that is not important anymore?? You pay now or you pay later... How many times will you have to upgrade the code etc, etc. Riverstone are worse than Cisco about breaking or I mean fixing things in there code releases.