Every network engineer should be familiar with the DNS basics – after all, all network failures are caused by DNS… unless it’s BGP.
The May 2022 ISP Column by Geoff Huston is an excellent place to brush up on your DNS basics and learn about new ideas, including a clever one to push DNS entries that will be needed in the future to a web client through a DNS-over-HTTPS session.
Every network engineer should be familiar with the DNS basics – after all, all network failures are caused by DNS… unless it’s BGP.
The May 2022 ISP Column by Geoff Huston is an excellent place to brush up on your DNS basics and learn about new ideas, including a clever one to push DNS entries that will be needed in the future to a web client through a DNS-over-HTTPS session.
Something that we have been waiting for a decade and a half to see has just happened: The datacenter is now the biggest business at Nvidia. …
Datacenter Becomes Nvidia’s Largest Business was written by Timothy Prickett Morgan at The Next Platform.
Why Core or Backbone is used in Networking?. Before we start explaining this question, let’s note that these two terms are used interchangeably. Usually, Service Providers use Backbone, and Enterprise Networks use Core terminology but they are the same thing.
The Key Characteristics of the Core, the Backbone part of the networks are:
Redundancy in this module is very important.
Most of the Core Network deployments in ISP networks are based on Full Mesh or Partial Mesh.
The reason for having full mesh physical connectivity in the Core network Continue reading
Multicast BIER – RFC8279
Bit Index Explicit Replication – BIER is an architecture that provides optimal multicast forwarding through a “BIER domain” without requiring intermediate routers to maintain any multicast-related per-flow state. BIER also does not require any explicit tree-building protocol for its operation.
So, it removes the need for PIM, MLDP, P2MP LSPs RSVP, etc.
A multicast data packet enters a BIER domain at a “Bit-Forwarding Ingress Router” (BFIR), and leaves the BIER domain at one or more “Bit-Forwarding Egress Routers” (BFERs).
The BFIR router adds a BIER header to the packet.
The BIER header contains a bit-string in which each bit represents exactly one BFER to forward the packet to.
The set of BFERs to which the multicast packet needs to be forwarded is expressed by setting the bits that correspond to those routers in the BIER header.
The obvious advantage of BIER is that there is no per-flow multicast state in the core of the network and there is no tree building protocol that sets up trees on-demand based on users joining a multicast flow.
In that sense, BIER is potentially applicable to many services where Multicast is used.
Many Service Providers currently investigating Continue reading
With the release of PowerCLI 12.6, a new module VMware.Sdk.Nsx.Policy was added to provide PowerShell binding for NSX Policy Manager APIs. This new module is auto generated from the NSX Policy API spec exposing all the features related to policy objects in NSX. The module also exposes cmdlets to Create/Edit/Delete NSX objects. This blog explains the use of PowerCLI NSX module, goes through all the different ways new cmdlets can be found and shows how to view documentation on the cmdlets with examples.
Along with the cmdlets to connect, disconnect and modify the NSX objects, there are a few helper cmdlets that make looking up new relevant cmdlets very easy.
The first one is Get-NsxOperation. This is a new feature in VMware.Sdk.Nsx.Policy and is ideal with you need to find the PowerCLI command that corresponds to an API operation and vice versa. You can also narrow down the search result using Where-Object and Select-Object filters.
Example:
Get-NsxOperation -Method GET -Path '/infra/segments'
Since the cmdlets by default returns all paths that start with /infra/segments you can also limit the search to exact match with client-side filter:
Get-NsxOperation -Method get Continue reading
Welcome to this sponsored Tech Bytes episode with HashiCorp, where we focus on how HashiCorp's Consul product helps automate network infrastructure. We also dig into what’s included in the Enterprise version of Consul. Joining us today is Hari Sankaran from the Consul product team.
The post Tech Bytes: HashiCorp’s Consul Tackles Network Infrastructure Automation (Sponsored) appeared first on Packet Pushers.
One of the mainstays of scripting—and now network management—are increasingly focused on making things “easier” for the human operator. Does this focus on making things “easier” for the operator produce a better experience, though? Or does it create frustration as humans try to “outguess” the computer’s programming and process? Join Tom Ammon and Russ White as they discuss the problems with scripting, automation, and ease-of-use.