I am designing a GIGE network that is interfacing with an ATM device that is connected to an OC48. My problem is what can Cisco offer in my design to combat the problem of a gig lan then going out of an OC12 pipe. This could be a bottle neck with all the images we have. Is there a way to load balance the atm links.
In theory, the only way you can avoid the Gigabit Ethernet network bottlenecking in one OC-12c pipe, is to aggregate two OC-12c connections. Gigabit Ethernet-to-ATM bridging should be able to accomplish the load balancing; I have done this with another vendor's switches, but I have no experience doing it with Cisco's 6509. (Even then, I don't think that customer ever actually generated a whole OC-12 pipe's worth of traffic at any given time, though both OC-12's were active.)
I guess it also depends what you're connecting to: some GigE ports get throttled down to around 600Mbps bandwidth by the hardware, to interface better with OC-12c. The only way to get full-duplex GigE speed I think is to point it into an OC-48c. I've done this with a Cisco ONS 15454; but this customer was being capped at 300Mbps feeding into the GigE by their Internet2 provider.
Do you have any other choices besides an OC-12, like dark fiber, or a GigE-based or WDM-based service provider? What kind of pictures are you moving, and how is it getting done now?
I built a GigE network over dark fiber for a health care system two years ago, that moved a lot of X-ray images from four hospitals across the fiber to a central storage area. The systems doing the X-rays had no better than Fast Ethernet connectivity, so we never ran out of bandwidth on the GigE backbone. I think that even with a Gigabit Ethernet NIC in a machine, you're not going to pump more than 400 to 600Mbps out of it, tops.
If you put two OC-12 modules in the chassis, can they be configured to be NNI connections, and have ATM automatically load-balance across both links to the ATM device that connects to the OC-48? If yes, I guess it depends on whether that device can do NNI also. Or, is there something else that limits us to just doing VLAN load-balancing per the hyperlink you provided?
What kind of ATM device is it that attaches to the OC-48? Who makes it?
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.