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yarn 12/5/2012 | 5:31:53 PM
re: Alcatel-Lucent, Juniper Get Core-Router Upgrades

Hey Soupafly, I'm not an expert on SDN but I am not sure if it applies here as well.


What you describe sounds like auto sensing 10/100/1000 Mbps ethernet, which pre-dates SDN by far. But as for applying this concept to 10/40/100 Gbps I wonder about the economics. As long as there's a significant cost difference between 10, 40 and 100G port cost, why would you run a 100G capable port at any lower rate? Even if you'd only use less than 40G traffic on average, would you not simply want to run it at 100G anyway to better deal with traffic peaks?


Anyway, I do think there will remain some "signature features" that set edge and core routers apart. More intelligence will start creeping in the core, where it makes sense, despite the end-to-end argument. I never thought NAT to be a core router feature until the CRS supported it. Perhaps the possibility creates the need, or new technologies could make the economies work where they didn't before. Like hybrid cars. Or SDN in core routers. But I think you'd still want to minimize mucking around with core routers and the Terabits of traffic they carry:-)

torivar 12/5/2012 | 5:31:45 PM
re: Alcatel-Lucent, Juniper Get Core-Router Upgrades

I think Cisco's take on the selective 10/40/100Gbps comes into play when also working with optical transport/OTN for long haul where you may not want to burn up wavelengths for long haul interconnects.&nbsp; You will also be able to expand as needed without swapping router interfaces or transponders if they are in use.&nbsp; In the end a better solution may be a physical solution like breakout cables which multiplex 10GE int 100GE similar to QSFP+ with 4x10GE breakouts.&nbsp;


Obviously core features will be driven by providers who ask for specific features.&nbsp; ALU is running the same software and NPUs on the 7750 and XRS so it's not a huge leap to support some of those features but you aren't going to see ISA support on the XRS, at least I don't think so.&nbsp;&nbsp; So no CGN, NAT, etc.&nbsp; Cisco on the other hand does support this stuff on the CRS but I really doubt you'll see it on their next-gen core platform.&nbsp;&nbsp;&nbsp; The Juniper PTX also supports a subset of features like L2VPN and L3VPN, but it is meant as an infrastructure tool and not so much used to carry customer traffic.&nbsp;

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