The new 15540 is a much better box, not much more $ either. There are some other people making extremely killer products, ONI being one that is very popular. I wouldn't invest in a 15454 anymore with all the new products out there, we still use them, but anything new will be a better box.
-----Original Message----- From: Barton F Bruce [mailto:barton@cent.net] Sent: Friday, March 22, 2002 5:17 PM To: Antony; Greg Pendergrass Cc: Richard A Steenbergen; 'Nanog@Merit. Edu' Subject: Re: long distance gigabit ethernet
The Cerent 454 (now cisco 15454) has 2 port Gig-E cards that cost a little more than a PA-GE card. The pair of ports shares OC-12 available to that slot (I'm assuming this is NOT an OC-192 equipped shelf) and the bandwidth can be split in certain multiples of STSes (OC-1), or used totally for one port. You only need as many STSes between boxes as you want to use.
You can play some nice games with 802.1Q VLANs and multiple sites, too.
There is a newer 4 port Cerent gig-E card I have not seen, but that probably can do a FULL gig-E on at least 2 of the ports (i.e. use a full OC-48 if the box has the OC-192 cross connect matrix installed). This newer card I think is only for point to point and does not "understand" VLANS, though probably can carry them.
Some DWDM boxes have their own gig-E ports. We have Sycamore ones that give us several Boston, NYC, and Reston routers on the same ethernet. Consider also that many switches support what cisco calls ether-channel. If one gig-E isn't enough, add more in parallel. Any router on this "ethernet" can freely talk to any other.
You are not stuck with just one router talking to one at the other end.
----- Original Message ----- From: "Antony" <antony@phenome.org> To: "Greg Pendergrass" <greg@band-x.com> Cc: "Richard A Steenbergen" <ras@e-gerbil.net>; "'Nanog@Merit. Edu'" <nanog@merit.edu> Sent: Friday, March 22, 2002 12:28 PM Subject: Re: long distance gigabit ethernet
On Fri, Mar 22, 2002 at 11:54:05AM -0500, Greg Pendergrass wrote:
I'm going to take a stab and assume that you're actually
in finding a longhaul line with GigE on the ends, and not so much how many miles you can get with whatever optics...
Absolutely right, I don't care what's in between as long as I have GigE at the end. Other options include using wave (too expensive), or ethernet over MPLS (worth considering although latency may be too high for longer that 1000 miles).
there are solutions of this type. SURFNet line, currently used for test and network research is an example. It is from Amsterdam to Chicago. It is presented as GigE at
more interested the ends.
So fairly long distance, RTT is 93 msec.Actually it terminate as SONET OC48 that goes too TDM Switch which has GigE interfaces. So there is SONET encapsulation in the middle. In theory we can get upto 2.5Gbps.
Line is provided by Teleglobe. End equipements are CISCO, ONS 15454. This don't do any routing.
This page may be interesting to browse. http://carol.wins.uva.nl/~delaat/optical/index.html
You can probably find different variants of such non
standard technology
from other carriers.
-antony