What should I do next? The core network bandwidth must grow rapidly !, Fast Bandwidth growth
There is no time, so this article is very short!
At present, OC-768 is a normal link, let alone OC-192!
For the router, the egress queue needs N acceleration ratio, take the OC-192 as an example, 4 interface router needs 40 Gbps bandwidth to meet the queuing requirements, heavy rain outside, the total cannot let people out. This is a huge challenge, so all of them switch to the input queue, but the challenge is pushed to the software, that is, the scheduling algorithm! At present, there is nothing better than changing the space for time. However, with the further increase in bandwidth (there are too many apps, the mobile Internet era, and the IOT era, this is inevitable. In the past, only people in your home had access to the Internet, now your electric fan and microwave oven need to access the Internet ...), when the unit storage efficiency is insufficient, no matter how large the space is, the time cannot be changed...
In fact, take the OC-768 link as an example, a tcp rtt takes about 0.25 seconds, so it must buffer at least OC-768 bandwidth * 0.25 of the data, that is, 10 Gb of data, 1 second buffer 10 Gb of data, it's hard to even DDR4... besides, it is not suitable to use DDR for large-scale caching... this is a challenge to the storage technology. Explosion!