Interaction between ECN and anycast routing

 Interesting post on the NANOG list about ECN and anycast routing.  The summary is that the provider was using ECMP with the ToS byte which means the path selected after connection establishment was different than before because during connection establishment ECT is not set while after connection establishment, ECT is set and CE may be used.  

This seems like a big mistake for the provide that configured the entropy calculation for ECMP.  They should never have used the ECN bits portion of the ToS byte.  Most implementations that I'm aware of use 5-tuple only (IPDA, IPSA, IP Protocol, Src Port, Dst Port).

A collection of networking resources

Forwarding ASICs

• P4 and P4runtime
• NPL and SDK-LT
• Buffering in various products
• Switch comparison table

SDN

• Netconf and YANG
• Differences between NSX and ACI @ NetworkWorld
• SDN and network virtualization: a reality check @ NetworkWorld

Network monitoring/telemetry

• Network monitoring tools
• sflow, NetFlow, JFlow, IPFIX
• INT, IOAM
• Sonata -- query driven telemetry using P4
• sflow testing
• sflow test suite
• source code for the tests
• running the tests
• Telemetry at IETF 104 March 2019

Machine learning for networking

• Packet Pushers article

Traffic engineering

• National backbone with latency metric

BGP EVPN

• Cisco Live presentation -- covers unicast, multicast, vpc

Cloud

• QinQ and Microsoft Azure

Buffering

• Buffer sizing workshop

Books

• Computer Networking: A Systems Approach by Larry Peterson & Bruce Davie
• Software Defined Networks: A Systems Approach by Peterson et al.
• 5G Mobile Networks: A Systems Approach by Larry Peterson and Oguz Sunay
• High Performance Browser Networking by Ilya Grigorik

Container networking

• Project Calico datasheet
• Why Calico?
• 5 ways to design your container network
• Kubernetes for network engineers
• Arista EOS and Tigera Calico Technical brief
• Determine the best networking option with Calico
• Comparing Flannel, Calico, Canal, Weave

SmartNICs

• Azure SmartNIC

Time Synchronization

• IEEE tutorial on time sync in TSN (2021)

About this blog

The blog is a collection of information related to computer networking.  Specifically, it is information about various topics that I have been exposed to during my career.  I will also have posts that serve as a reference desk or collection of links to various pieces of information.

You can send me feedback either by leaving a comment or by emailing me.  My email address is available in my profile.