HA inside Data Center
Overview
In Leaf/Spine VXLAN based data centers, everyone likes to provide HA with Active/Active in it, so choices are different. There are two types of HA in data centers, Layer 3 and Layer 2.
For layer 3 HA, always there is more than one spine that can provide ECMP and HA at same time. However, Layer 2 redundancy for hosts and l4-l7 services that connected to leafs are more than an easy choice. As Cisco provided vPC for nearly 10 years ago, almost this was the first (and only) choice of network engineers. Also, other vendors have their own technologies. For example, Arista provided Multi-chassis Link Aggregation (MLAG) for L2 HA in leafs. But, there is always a problem in implementation of them. One example in vPC is “peer-link” that is an important component in the vPC feature. However, it can be a tough one in most cases like Dynamic Layer-3 routing over vPC or Orphan members that may cause local traffic switching between vPC peers without using Fabric links.
To address the “peer-link” issue, there is a “fabric-peering” solution that uses Fabric links instead of “peer-link” and convert it to “virtual peer-link”. With this solution there is no concern Continue reading
The Week in Internet News: U.S. Lawmakers Threaten Anti-Encryption Regulations
Don’t make us make you: Members of a U.S. Senate committee recently told representatives of Facebook and Apple that they need to give police access to customers’ encrypted communications, or they will be forced to by Congress, the Washington Post reports. The companies told lawmakers that backdoors in encryption would be exploited by cybercriminals.
Facebook declines: Meanwhile, Facebook has refused a request from U.S. Attorney General William Barr to build encryption backdoors into WhatsApp and Messenger, the New York Times reports.
Women want to be included: As Internet access is growing in the central African country of Chad, women are demanding to be in on the action, Reuters reports. Women across sub-Saharan Africa are currently 15 percent less likely to own a mobile phone than men are and 41 percent less likely to use the mobile Internet, the story says.
Gigabit tech boom: Gigabit-speed Internet service is turning some small U.S. cities into tech centers, bringing businesses and jobs to the areas, Inc. says. The story looks at businesses taking advantage of gigabit-speed networks in Chattanooga, Tennessee, Melbourne, Florida, and Sarasota, Florida.
Arrested for reporting: Thirty journalists are currently in prison worldwide on charges related to Continue reading
Network Break 265: Cisco Chips At Broadcom With New ASIC; AWS Gives Networking Some Love
On today's Network Break we analyze Cisco's new ASIC platform and the 8000 router series, dig into a string of AWS announcements related to networking and security, and discuss new products from Cato Networks and Silver Peak.
The post Network Break 265: Cisco Chips At Broadcom With New ASIC; AWS Gives Networking Some Love appeared first on Packet Pushers.
Network Break 265: Cisco Chips At Broadcom With New ASIC; AWS Gives Networking Some Love
On today's Network Break we analyze Cisco's new ASIC platform and the 8000 router series, dig into a string of AWS announcements related to networking and security, and discuss new products from Cato Networks and Silver Peak.Figure Out What Problem You’re Trying to Solve
A long while ago I got into an hilarious Tweetfest (note to self: don’t… not that I would ever listen) starting with:
Which feature and which Cisco router for layer2 extension over internet 100Mbps with 1500 Bytes MTU
The knee-jerk reaction was obvious: OMG, not again. The ugly ghost of BRouters (or is it RBridges or WAN Extenders?) has awoken. The best reply in this category was definitely:
I cannot fathom the conversation where this was a legitimate design option. May the odds forever be in your favor.
A dozen “this is a dumpster fire” tweets later the problem was rephrased as:
Read more ...Physically man-in-the-middling an IoT device with Linux Bridge
This is a quick writeup of how I did some analysis of an IoT device (The Thing) by physically inserting a Linux box into the network path between The Thing and the network service it consumed. The approach described here involves being physically close to the target system, but it should work equally well1 anywhere there's an Ethernet link along the path between The Thing and it's server.
First, the topology: The Thing is attached to an Ethernet switch and is part of the 192.168.1.0/24 subnet. We'll be physically inserting ourselves into the path of the red cable in this diagram.
 |
| Initial setup |
The first step is to get a dual-homed Linux box into the path. I used an Ubuntu 18.04 machine with the following netplan configuration:
network:
version: 2
renderer: networkd
ethernets:
eth0:
dhcp4: no
eth1:
dhcp4: no
bridges:
br0:
addresses: [192.168.1.2/24]
gateway4: 192.168.1.1
interfaces:
- eth0
- eth1
This configuration defines an internal software-based bridge for handling traffic between The Thing and the switch. Additionally, it creates an IP interface for the Linux host to communicate with neighbors attached to the bridge (everybody on 192.168.1. Continue reading
Samsung Expands 5G Footprint With Videotron
Samsung will provide massive MIMO and dual-band base stations to support the operator’s 4G LTE...
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Google Transfer Service Mitigates Cloud Migration Migraines
Transfer Service aims to removes inherent complexities with large-scale data transfers and moving...
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Heavy Networking 494: Hybrid Cloud Networking – All The Details
Today's Heavy Networking drills into routing complexities and options for hybrid cloud networking. Our guest is William Collins, lead cloud architect at a large healthcare company. He shares his experiences connecting resources on premises to public cloud services. We also discuss the importance of design and governance, and why your networking skills are absolutely critical when it comes to the cloud.
The post Heavy Networking 494: Hybrid Cloud Networking – All The Details appeared first on Packet Pushers.
Amazon Leads Linux Foundation’s Edge NOS Project
DENT will use the Linux Kernel and other Linux-based projects as the basis for the open source NOS,...
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Service to service communication within GKE cluster
In my last blog, I covered options to access GKE services from external world. In this blog, I will cover service to service communication options within GKE cluster. Specifically, I will cover the following options: Cluster IP Internal load balancer(ILB) Http internal load balancer Istio Traffic director In the end, I will also compare these … Continue reading Service to service communication within GKE clusterCiena Chief Calls Infinera 600G Uncompetitive Amid Strong Q4
Amid double-digital growth in 2019, Ciena CEO Gary Smith says Infinera's 600G optics lack the...
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Weekly Wrap: Aviatrix CEO: SD-WAN Is Dead. AWS Killed It
SDxCentral Weekly Wrap for Dec. 13, 2019: AWS' Outposts, Wavelengths are the nail in SD-WAN's...
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