Dual Queue Networking: How to Prepare Your Network to Support L4S and NQB

  Рет қаралды 1,140

NANOG

NANOG

4 ай бұрын

The IETF has standardized a new protocol for having two network queues at bottleneck links via L4S (Low Latency, Low Loss, Scalable Throughput) and NQB (Non-Queue-Building Per Hop Behavior). These new standards may be able to significantly lower "working" latency (latency under load) for better real-time traffic performance and to support new AR and VR applications.
This talk will explain how dual queue networking works and explains what network operators need to do to support this - including allowing end-to-end passing of ECN marks and the use of DSCP-45 across domain boundaries.
Jason Livingood: Jason leads Technology Policy, Product, and Standards, and is the single point of coordination for Comcast Cable's technology & product division (TPX) on all key tech policy, standards, industry organization and research engagements. This encompasses all technologies and products. Technical product focus includes leading network product roadmap development (e.g., FTTH). At the current time he is also shepherding the deployment of new low latency networking standards in the Comcast network. Jason has been at Comcast over 25 years, having initially joined the internal startup team to take cable modems from the lab to create Comcast's consumer internet business. He has since been part of creating and launching the commercial internet business, voice service, home security service, and public WiFi network. He's been in a variety of operational and development roles and now serves in a strategic role. / jlivingood
Speaker: Jason Livingood - Comcast

Пікірлер: 4
@richardbennett7066
@richardbennett7066 3 ай бұрын
Jason's surname is Livingood.
@robertmcmahon921
@robertmcmahon921 3 ай бұрын
I think it might be better terminology to use term "fronthaul" for in premise "transit" networks which are from the OSP demarc (e.g. Cable MODEM) to the per room radio heads. Backhual is too confusing here, at least to me. Then there are three fronthaul choices in priority order, fiber fronthaul, copper fronthaul and wireless fronthaul. Copper & ethernet is going got top out at 10Gb/s. The signal loss of 100Gb/s over copper is in dB per inch, roughly 4 meters for a passive cable. Signal loss over fiber is .5db per kilometer and is independent of modulation and will scale to petabits/sec. So, make sure while you're installing communications fronthaul conduits to consider future fiber pulls too. The per room location doesn't really need a wall outlets as the fiber can be connected to wireless radio in the ceiling. It's sorta analogous to irrigation systems where the physical aspects of the landscape and plants should influence both the sprinkler heads placements and how the PVC is laid and zoned. Placing the radios (and antennas) properly and using a proper fronthaul design will help a lot.
@robertmcmahon921
@robertmcmahon921 3 ай бұрын
How to handle lots of flows through a queue? Focus on the elephants? kzfaq.info/get/bejne/j6-DqM2KyNTGg30.html
@80216e
@80216e 3 ай бұрын
Individual flow through a queue can be categorized as a micro-flow (based on ip tuple) which could then individually be monitored for good behaviour (Queue Protection).
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