BGP EVPN Part-I: Challenges in Traditional Switched Datacenter Networks

Inefficient Link Utilization

The default Layer 2 Control Plane protocol in Cisco NX-OS is a Rapid Per-VLAN Spanning Tree Plus (Rapid PVST+), which runs 802.1w standard Rapid Spanning Tree Protocol (RSTP) instance per VLAN. Rapid PVST+ builds a VLAN-specific, loop-free Layer 2 data path from the STP root switch to all non-root switches. Spanning Tree Protocol, no matter which mode we use, allows only one active path at a time and blocks all redundant links. One general solution for activating all Inter-switch links is placing an STP root switch for odd and even VLANs into different switches. However, STP allows only a VLAN-based traffic load balancing.


CPU and Memory Usage

After building a loop-free data path, switches running Rapid PVST+ monitor the state of the network by using Spanning Tree instance-based Bridge Protocol Data Units (BPDU). By default, each switch sends instance-based BPDU messages from their designated port in two-second intervals. If we have 2000 VLANs, all switches must process 2000 BPDUs. To reduce CPU and Memory consumption caused by BPDU processing, we can use Multiple Spanning Tree – MSTP (802.1s), where VLANs are associated with Instances. For example, we can attach VLANs 1-999 to one instance and Continue reading

Goodbye, ipSpace.net Subscription

I ran the first webinar as an independent author almost exactly fourteen years ago1, with the first ticket sold just before New Year’s Eve. I kept focusing on individual webinars until someone asked me, “Would it be possible to buy access to everything you did?” His question effectively created the ipSpace.net subscription, with the first one sold in late 2010 (I still have the email that triggered the whole process).

Read more …

Goodbye, ipSpace.net Subscription

I ran the first webinar as an independent author almost exactly fourteen years ago1, with the first ticket sold just before New Year’s Eve. I kept focusing on individual webinars until someone asked me, “Would it be possible to buy access to everything you did?” His question effectively created the ipSpace.net subscription, with the first one sold in late 2010 (I still have the email that triggered the whole process).

Read more …

Apollo 11 notes

I was re-reading the Apollo 11 mission reports, as one does, and decided to take some notes along the way.

If you’re interested in these things, I also highly recommend curiousmarc’s series on the Apollo comms hardware.

Notes

First time I’ve seen the word “doff”. Can’t wait to use it in daily conversation.

The rocket equation is a beast. The LM descent stage had 8’210kg of propellant. The ascent stage only 2’365kg.
– Volume 1, Page 50

In total 10’849kg out of 15’061 (72%) of the LM was propellant. (excluding the astronauts themselves)

The LM flown on Apollo 10 did not have the landing program in its computer. To prevent the temptation to land?
– Volume 1, Page 62

Armstrong’s parents were “Mr. and Mrs. Stephen Armstrong”. Michael Collins’ mother is mentioned, but her name is also lost to history, as she’s referred to as “Mrs. James L. Collins”. Only Buzz Aldrin’s mother is named (and what a name!), as Marion Moon Aldrin.

All three were born in 1930, making them turn 39 in 1969.
– Volume 1, Page 76-78

“High speed” data mode is 2400bps, divided into 240 bit blocks.
– Volume 1, Page 93

Aside from the Continue reading

Configuring EVPN on NX-OS

In this post we will configure EVPN on NX-OS. We will reuse the VXLAN topology from my previous post. The following will describe the setup in this post:

  • VXLAN topology with OSPF as the IGP in the underlay using unnumbered links.
  • EVPN in the overlay using iBGP.
  • Spines acting as route reflectors.
  • Separate loopbacks for IGP, BGP, and NVE.
  • Ingress replication based on EVPN.
  • Enhancements such as anycast gateway, ARP suppression, etc., will be covered in future posts.

The BGP topology is shown below:

I will cover all the details of configuring EVPN and establishing the BGP sessions. We will then cover the actual exchange of routes in detail in separate posts in the future.

Starting out, the following globals and features need to be configured:

Next, let’s configure BGP on the spines with the following settings:

Then let’s configure BGP on the leafs:

The devices will now advertise that they have AFI L2VPN and SAFI EVPN:

The BGP sessions are now up:

Leaf1# show bgp l2vpn evpn sum
BGP summary information for VRF default, address family L2VPN EVPN
BGP router identifier 192.0.2.3, local AS number 65000
BGP table version is 4, L2VPN EVPN config peers  Continue reading

Tigera Closes Out 2023 with Significant Momentum for Calico as Demand for Container Security Accelerates

As 2023 comes to a close, we’re happy to report that we’ve had a successful year full of powerful product advancements and notable third-party recognition.

Key product enhancements

  • Plug-and-play Runtime Threat Defense – Combines signature and behavior-based threat detection to protect against both known and zero-day threats. Calico Runtime Threat Defense provides preconfigured threat detectors to detect most common MITRE attack techniques for container and network-based attacks.
  • Security Score and Recommended Actions – Provides an unparalleled view of security risks, enabling enterprises to identify, prioritize and mitigate them swiftly.
  • Streamlined autoscaling with Windows HostProcess Container – Simplifies Kubernetes operations while saving time and resources.
  • IPv6 support for eBPF – Empowers enterprises to enhance the performance and scalability of their applications, ensuring they meet the demands of modern workloads.
  • Calico cluster mesh for VxLAN – Offers a scalable solution for multi-cluster deployments, enabling multi-cluster pod-to-pod connectivity and enhancing security and visibility.

With these new enhancements, Calico is the industry’s most complete solution for securing and observing Kubernetes environments.

User feedback

Calico Open Source users represent a robust sample of IT professionals from across industries and use cases. We polled these users to better understand their needs and compiled the insights into Continue reading

The Terrapin Attack: A New Threat to SSH Integrity

This new vulnerability, Terrapin, breaks the integrity of SSH’s secure channel. Yes, that’s just as bad as it sounds. Anyone who does anything on the cloud or programming uses Secure Shell (SSH). So any vulnerability is bad news. Guess what? I’ve got some bad news. Researchers at Ruhr University have found a  significant vulnerability in the SSH cryptographic network protocol, which they’ve labeled CVE-2023-48795: General Protocol Flaw; CVE-2023-46446: Rogue Session Attack in AsyncSSH poses a serious threat to internet security. Terrapin enables attackers to compromise the integrity of SSH connections, which are widely used for secure access to network services. The Terrapin attack targets the SSH protocol by manipulating prefix sequence numbers during the handshake process. This manipulation enables attackers to remove messages sent by the client or server at the beginning of the secure channel without detection. The attack can lead to using less secure client authentication algorithms and deactivation-specific countermeasures against keystroke timing attacks in OpenSSH 9.5. Terrapin is a Man-in-the-Middle The good news — yes, there is good news — is that while the Terrapin attack Continue reading

Introduction to EVPN In VXLAN Networks

In previous posts I described VXLAN using flood and learn behavior using multicast or ingress replication. The drawback to flood and learn is that frames need to be flooded/replicated for the VTEPs to learn of each other and for learning what MAC addresses are available through each VTEP. This isn’t very efficient. Isn’t there a better way of learning this information? This is where Ethernet VPN (EVPN) comes into play. What is it? As you know, BGP can carry all sorts of information and EVPN is just BGP with support to carry information about VTEPs, MAC addresses, IP addresses, VRFs, and some other stuff. What does EVPN provide us?

  • Ability to discover VTEPs.
  • Messaging of MAC prefixes and IP prefixes.
  • Reduced amount of flooding.
  • Optionally ARP suppression.

Note that the use of EVPN doesn’t entirely remove the need for flooding using multicast or ingress replication. Hosts still need to use ARP/ND to find the MAC address of each other, although ARP suppression could potentially help with that. There may also be protocols such as DHCP that leverage broadcast for some messages. In addition, there may be silent hosts in the fabric where VTEP is not aware that the host is Continue reading

Cisco Acquires Isovalent: A Big Win for Cloud-Native Network Security and a Validation of Tigera’s Vision

This week’s news of Cisco’s intent to acquire Isovalent sends an important message to the cloud security ecosystem: network security is no longer an afterthought in the cloud-native world. It’s now a critical component of any robust security posture for cloud-native applications. This move not only validates the work of the Isovalent team in evangelizing this essential category but also underscores the vision Tigera has pioneered since 2016 with Project Calico.

I would first like to extend heartfelt congratulations to Isovalent and its founders on their well-deserved exit and thank them for their invaluable contributions to cloud-native network security.

Cisco’s acquisition recognizes that traditional perimeter security solutions simply don’t translate to the dynamic, distributed nature of cloud-native architectures and that network security is a critical part of a good cloud-native security design. This is a fundamental truth that Tigera identified early on with Project Calico. We saw the need for a fundamentally different approach to network security, one tailored to the unique demands of containerized and distributed applications running in the cloud.

Calico Open Source, born from this vision, has become the industry leader in container networking and security. It now powers over 100 million containers across 8 million+ Continue reading

Calico monthly roundup: December 2023

Welcome to the Calico monthly roundup: December edition! From open source news to live events, we have exciting updates to share—let’s get into it!

Tigera has achieved AWS Security Competency status!

Tigera has gained a new AWS Security Competency, which we’re proud to add to our already existing AWS Containers Software Competency. Read about the addition of our newest security competency.

Read more.
Find your Cluster Security Score

Calico Cloud is releasing new capabilities for security posture management called Security Scoring and Recommended Actions. Start measuring and tracking your security posture.

Learn more.
Customer case study: Leader-bet

Calico provides container security and compliance for online gaming giant, Leader-bet. Read our case study to learn more.

Read case study.
Comparing NGFW container firewalls with Calico container firewall

Learn how to establish robust firewall policies with just code or a single click for advanced threat protection using behavior-based learning and IDS/IPS integrated with the firewall.

Read blog post.

Open source news

Calico v3.27 is out 🎉 and there are a lot of new features, updates, and improvements that are packed into this release. Here is a breakdown of the most important changes:

  • Significant performance improvements, especially for extremely large clusters
  • Calico VPP Continue reading

D2C227: Platforms Reduce Cognitive Overhead

Today’s show explores platform engineering. Guest Chad McElligott has thought a lot about the practice of platform engineering, and a blog post and talk he gave about the subject inspired us to reach out and have a conversation. Chad describes platform engineering as “the application of a Product Mindset to supporting your engineering organization’s software... Read more »

D2C227: Platforms Reduce Cognitive Overhead

Today's Day Two Cloud explores platform engineering. We talk about how to balance the needs of infrastructure engineers and developers, how to shift to a delivery model, and how to account for human personalities and operational processes in your platform. Tools and tech are essential, but you also have to consider and incorporate the non-tech stuff.

The post D2C227: Platforms Reduce Cognitive Overhead appeared first on Packet Pushers.

The RFC Process

I’ve just finished a seven-part series over at Packets Pushers about the process of writing and publishing an RFC. Even if you don’t ever plan to write a draft or participate in the IETF, this series will give you a better idea of the work that goes into creating new standards and IETF documents.

So … you have an idea you think would fit perfectly into the realm of the Internet Engineering Task Force (IETF)—but where do you start?

This, the second, post, will consider document formatting and two of the (sometimes) more difficult sections of an IETF draft to fill in.

There are other seemingly mystical concepts in the IETF process as well—for instance, what is a “document stream,” and what is a document’s “status?”

You’re almost ready to submit a shiny new document to the IETF for consideration, right? Not quite yet—we still need to deal with mandatory sections and language.

You cannot simply post a draft to the IETF repository and expect “someone, somewhere,” to take action.

The working group chairs asked if your draft should become a working group item, and the consensus was to accept! It might seem like your draft is home free Continue reading

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