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Running Routing Protocols over MLAG Links

It took vendors like Cisco years to start supporting routing protocols between MLAG-attached routers and a pair of switches in the MLAG cluster. That seems like a no-brainer scenario, so there must be some hidden complexities. Let’s figure out what they are.

We’ll use the familiar MLAG diagram, replacing one of the attached hosts with a router running a routing protocol with both members of the MLAG cluster (for example, R, S1, and S2 are OSPF neighbors).

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Running Routing Protocols over MLAG Links

It took vendors like Cisco years to start supporting routing protocols between MLAG-attached routers and a pair of switches in the MLAG cluster. That seems like a no-brainer scenario, so there must be some hidden complexities. Let’s figure out what they are.

We’ll use the familiar MLAG diagram, replacing one of the attached hosts with a router running a routing protocol with both members of the MLAG cluster (for example, R, S1, and S2 are OSPF neighbors).

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The DNS at the IGF

I was invited to participate in a session at IGF 2022 that was devoted to the workings of the DNS. I’d like to share my contribution to this session with my thoughts on where the DNS is headed.

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Hedge December 22 Update

The Hedge December update contains information about upcoming episodes and training—listen in for the inside scoop!

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Troubleshooting Live Training

My next live training course is coming up on the 16th of December: Troubleshooting. This is one of those classes where I’m taking formal training from a former life (electronic engineering) and applying it to the networking world. From the description—

Troubleshooting is a fundamental skill for all network engineers, from the least to most experienced. However, there is little material on correct and efficient troubleshooting techniques in a network engineering context, and no (apparent) live training in this area. Some chapters in books exist (such as the Computer Networking Problems and Solutions, published in December 2017), and some presentations in Cisco Live, but the level of coverage for this critical skill is far below what engineers working in the field to develop solid troubleshooting skills.

This training focuses on the half-split system of troubleshooting, which is widely used in the electronic and civil engineering domains. The importance of tracing the path of the signal, using models to put the system in context, and the use of a simple troubleshooting “loop” to focus on asking how, what, and why are added to the half-split method to create a complete theory of troubleshooting. Other concepts covered in this course are the Continue reading

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Palo Alto Networks looks to shore up healthcare IoT security

Machine-learning based visibility and monitoring are at the heart of the cybersecurity company’s new healthcare-focused, add-on application to its core firewall products.

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Converting numbers on Linux among decimal, hexadecimal, octal, and binary

You might not be challenged very often to convert numbers from one numbering system to another but, when you are, you can do it with either of two fairly easy commands on the Linux command line.Converting in your head can be taxing, especially for longer numbers. While the decimal numbering system allows any digit in a number to have any of ten values (0-9), digits in hexadecimal numbers can have 16 (0-F), digits in octal numbers only eight (0-7) and digits in binary numbers only two (0-1).And, whether you like it or not, from time to time you are likely to run into numbers displayed in hex or octal, and knowing how to convert them from one number base to another can come in handy.To read this article in full, please click here

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Converting numbers on Linux among decimal, hexadecimal, octal, and binary

You might not be challenged very often to convert numbers from one numbering system to another but, when you are, you can do it with either of two fairly easy commands on the Linux command line.Converting in your head can be taxing, especially for longer numbers. While the decimal numbering system allows any digit in a number to have any of ten values (0-9), digits in hexadecimal numbers can have 16 (0-F), digits in octal numbers only eight (0-7) and digits in binary numbers only two (0-1).And, whether you like it or not, from time to time you are likely to run into numbers displayed in hex or octal, and knowing how to convert them from one number base to another can come in handy.To read this article in full, please click here

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Tech Bytes: Diagnosing SaaS Outages When It’s Not The Network (Sponsored)

Today on the Tech Bytes podcast we explore two outages of big-time cloud applications with sponsor ThousandEyes, a Cisco company. These outages share a common thread, in that the network was up and the applications were reachable, but problems on the backend meant the applications weren’t available. We discuss what happened and offer takeaways to minimize business disruptions.

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Tech Bytes: Diagnosing SaaS Outages When It’s Not The Network (Sponsored)

Today on the Tech Bytes podcast we explore two outages of big-time cloud applications with sponsor ThousandEyes, a Cisco company. These outages share a common thread, in that the network was up and the applications were reachable, but problems on the backend meant the applications weren’t available. We discuss what happened and offer takeaways to minimize business disruptions.

The post Tech Bytes: Diagnosing SaaS Outages When It’s Not The Network (Sponsored) appeared first on Packet Pushers.

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Keep the learning pace! A Holiday recap about network automation sessions

AnsibleFest in October was an amazing experience; the best part was meeting and chatting about multiple network automation use cases with our customers and partners.

In case you want to review the most relevant sessions, here is a summary on the abridged network automation related sessions that you can check on-demand for the next 5 months:

 

Why unified network automation and why now? 

Bob Laliberte, Principal Analyst, ESG covers the complexity of modern networks which span across multi-domain teams including campus, branches, data centers, WAN networks and now edge across distributed locations. 

Network automation, when implemented as an end to end solution, can unify teams and make it faster and more efficient to deliver network services.

IT decision makers and managers will be able to have a better insight on network automation challenges and KPIs.

 

Noor Shadid, Wells Fargo | theCUBE at Red Hat AnsibleFest 2022

In this interview, Wells Fargo Senior Vice President, Noor Shadid, describes their cultural change with automation and how Wells Fargo positioned itself as a technology company.

 

Journey to Automated NetOps in Financial Services 

John Teixido from Truist and Tony Dubiel from Red Hat cover this amazing session. You Continue reading

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Just How Bad Is CXL Memory Latency?

Conventional wisdom says that trying to attach system memory to the PCI-Express bus is a bad idea if you care at all about latency. …

Just How Bad Is CXL Memory Latency? was written by Tobias Mann at The Next Platform.

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Intel Chip Research Pushes Power Efficiency And Performance

Since Pat Gelsinger’s return to Intel as chief executive officer in early 2021, the company has bet big on bolstering its manufacturing processes and foundry business, expanded its fab footprint in the United States, and advocated for expanding the country’s chip making capabilities. …

Intel Chip Research Pushes Power Efficiency And Performance was written by Jeffrey Burt at The Next Platform.

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Network Break 410: AWS Previews Secure Remote Access; Broadcom Promises Not To Raise VMware Prices

On today's Network Break we discuss new AWS previews for secure remote access and for connecting applications and services across VPCs. We also discuss a serious outage at Hive Social, Open RAN 5G coming to fighter jets, a promise from Broadcom not to raise prices if the VMware acquisition goes through, and more IT news.

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Network Break 410: AWS Previews Secure Remote Access; Broadcom Promises Not To Raise VMware Prices

On today's Network Break we discuss new AWS previews for secure remote access and for connecting applications and services across VPCs. We also discuss a serious outage at Hive Social, Open RAN 5G coming to fighter jets, a promise from Broadcom not to raise prices if the VMware acquisition goes through, and more IT news.

The post Network Break 410: AWS Previews Secure Remote Access; Broadcom Promises Not To Raise VMware Prices appeared first on Packet Pushers.

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Decoding TCP flags in NetFlow and IPFIX.

The post Decoding TCP flags in NetFlow and IPFIX. appeared first on Noction.

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NFA v 22.12 – TCP flags visibility, support for Ubuntu 22.04 and RHEL 9, performance boost, and more!

The post NFA v 22.12 – TCP flags visibility, support for Ubuntu 22.04 and RHEL 9, performance boost, and more! appeared first on Noction.

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Review: S5648X-2Q4Z Switch – Part 1: VxLAN/GENEVE/NvGRE

After receiving an e-mail from a newer [China based switch OEM], I had a chat with their founder and learned that the combination of switch silicon and software may be a good match for IPng Networks. You may recall my previous endeavors in the Fiberstore lineup, notably an in-depth review of the [S5860-20SQ] which sports 20x10G, 4x25G and 2x40G optics, and its larger sibling the S5860-48SC which comes with 48x10G and 8x100G cages. I use them in production at IPng Networks and their featureset versus price point is pretty good. In that article, I made one critical note reviewing those FS switches, in that they’e be a better fit if they allowed for MPLS or IP based L2VPN services in hardware.

I got cautiously enthusiastic (albeit suitably skeptical) when this new vendor claimed VxLAN, GENEVE, MPLS and GRE at 56 ports and line rate, on a really affordable budget (sub-$4K for the 56 port; and sub-$2K for the 26 port switch). This reseller is using a less known silicon vendor called [Centec], who have a lineup of ethernet silicon. In this device, the CTC8096 (GoldenGate) is used for cost effective high density 10GbE/40GbE applications Continue reading

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netlab: VRF Lite over VXLAN Transport

One of the comments I received after publishing the Use VRFs for VXLAN-Enabled VLANs claimed that:

I’m firmly of the belief that VXLAN should be solely an access layer/edge technology and if you are running your routing protocols within the tunnel, you’ve already lost the plot.

That’s a pretty good guideline for typical data center fabric deployments, but VXLAN is just a tool that allows you to build multi-access Ethernet networks on top of IP infrastructure. You can use it to emulate E-LAN service or to build networks similar to what you can get with DMVPN (without any built-in security). Today we’ll use it to build a VRF Lite topology with two tenants (red and blue).

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netlab: VRF Lite over VXLAN Transport

One of the comments I received after publishing the Use VRFs for VXLAN-Enabled VLANs claimed that:

I’m firmly of the belief that VXLAN should be solely an access layer/edge technology and if you are running your routing protocols within the tunnel, you’ve already lost the plot.

That’s a pretty good guideline for typical data center fabric deployments, but VXLAN is just a tool that allows you to build multi-access Ethernet networks on top of IP infrastructure. You can use it to emulate E-LAN service or to build networks similar to what you can get with DMVPN (without any built-in security). Today we’ll use it to build a VRF Lite topology with two tenants (red and blue).