Cisco Internal VLAN Usage
About a month ago I worked on an old CatOS switch. Working on this switch reminded me about some of the differences between CatOS and IOS. One of the big differences is how a Layer 3 routed interface is configured between the two OS versions. On a Catalyst running IOS, it is almost identical as […]
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The post Cisco Internal VLAN Usage appeared first on Packet Pushers Podcast and was written by Charles Galler.
Ordered FIB
In a past post, we’ve discussed microloops in link state protocols. If we examine a small ring topology (if you come to my Interop talk, you’ll discover that ring topologies are the heart of network convergence), we can see where and how a microloop forms. If the link between A and B fails, A and […]
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Restoring Trust in the Internet – Part 2
In my last post I talked about the broken trust in the Internet. Now let’s talk about steps we need to take to restore that trust. First, we need to realize that trust is regained by proving we are trustworthy. There is nothing we can do, or say, that will instantly restore trust; it is […]
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The post Restoring Trust in the Internet – Part 2 appeared first on Packet Pushers Podcast and was written by Jonathan Strine.
Show 184 – The Future of Networking Part 2 as Inspired by #NFD7
At Networking Field Day 7, the delegates were treated to vendor demonstrations that challenged our thinking about the future of networking. Perhaps the industry is not agreed on just how we’ll implement and operate our networks in the coming years, but one thing is for certain. The landscape will be different. In this and the previously […]
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The post Show 184 – The Future of Networking Part 2 as Inspired by #NFD7 appeared first on Packet Pushers Podcast and was written by Ethan Banks.
Review: Hadoop Operations
Hadoop Operations Eric Sammer Hadoop is one of those applications all data centers seem to need to support – and there is a lot of information out there about how Hadoop works, how to use it, and how to build Hadoop systems. From these, it’s pretty easy to glean a general set of requirements for […]
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Secret CEF Attributes Part 6, The BGP Connection
In the first five parts of this series we covered all the steps necessary to distribute QoS and monitoring to a large backbone. I guess at this point I should mention that this technology has a name (and acronym, of course.) Cisco calls it QoS Policy Propagation through BGP (QPPB.) I hope these blog posts […]
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The post Secret CEF Attributes Part 6, The BGP Connection appeared first on Packet Pushers Podcast and was written by Dan Massameno.
TCP/IP over VXLAN Bandwidth Overheads
A recent ‘conversation’ around VXLAN encapsulation and MTU with Matt Oswalt got me thinking about this subject recently. My calculations were mostly wrong (Matt’s were not) and I also found a shocking amount of incorrect information on the subject out on the ‘net too. So, let’s let the maths do the talking. TL;DR – As […]
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The post TCP/IP over VXLAN Bandwidth Overheads appeared first on Packet Pushers Podcast and was written by Steven Iveson.
Show 183 – Storage Network Design
This week, the Packet Pushers talk about storage network design mostly in the context of converged infrastructure. Guests J Metz, Chris Wahl, and Russ White do all the heavy lifting of those storage-related packets from one end of the data center to the other. Show Outline When traditional network engineers think about designing for storage, […]
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The post Show 183 – Storage Network Design appeared first on Packet Pushers Podcast and was written by Ethan Banks.
Using Next Generation MVPN to optimize your MPLS core – Part 1
Like many network engineers I have had difficulties with multicast, the logic is all messed up right!? The only implementation of mVPN I had seen in test or production was Draft Rosen (RFC6037). Now I know Draft Rosen works well but it does have its limitations and I’m a firm believer in getting unnecessary junk […]
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The post Using Next Generation MVPN to optimize your MPLS core – Part 1 appeared first on Packet Pushers Podcast and was written by Keith Humphreys.
Coffee Break – Show 5
Our attendance at the Open Networking Symposium promotes a discussion of events there.
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The post Coffee Break – Show 5 appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Coffee Break – Show 5
Our attendance at the Open Networking Symposium promotes a discussion of events there.
The post Coffee Break – Show 5 appeared first on Packet Pushers.
Coffee Break – Show 5
Our attendance at the Open Networking Symposium promotes a discussion of events there.Secret CEF Attributes, Part 5
So far we’ve explored some very cool features of CEF and the attributes we can push into the FIB to identify certain kinds of traffic. We can color the prefixes in the RIB and FIB with a particular IP-Precedence, QoS-group or traffic_index and we can then perform traffic monitoring, shaping and policing and packet marking […]
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The post Secret CEF Attributes, Part 5 appeared first on Packet Pushers Podcast and was written by Dan Massameno.
Show 182 – The Future of Networking Part 1 As Inspired By #NFD7
At Networking Field Day 7, the delegates were treated to vendor demonstrations that challenged our thinking about the future of networking. Perhaps the industry is not agreed on just how we’ll implement and operate our networks in the coming years, but one thing is for certain. The landscape will be different. In this and the […]
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The post Show 182 – The Future of Networking Part 1 As Inspired By #NFD7 appeared first on Packet Pushers Podcast and was written by Ethan Banks.
NAT saves the day!
Introduction NAT is bad, it breaks end to end connectivity. It’s misused as a security tool. Using NAT kills kittens. Yes yes, we all know that. That doesn’t mean that there aren’t valid use cases for NAT and when NAT can save the day. What was the problem? Imagine that you have a device that […]
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The post NAT saves the day! appeared first on Packet Pushers Podcast and was written by ddib.
Coffee Break – Show 4
This week Andrew & Greg are joined Howard Marks whose abundance of commentary leads to a surfeit of opinions on the lack of anything happening at Mobile World Congress. Show Notes MWC – Wearable computing on the rise? Netflix and Comcast: Is this the first Network Neutrality domino to fall? Frontier customer complaints drop nearly […]
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The post Coffee Break – Show 4 appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Coffee Break – Show 4
[player] This week Andrew & Greg are joined Howard Marks whose abundance of commentary leads to a surfeit of opinions on the lack of anything happening at Mobile World Congress. Show Notes MWC – Wearable computing on the rise? Netflix and Comcast: Is this the first Network Neutrality domino to fall? Frontier customer complaints drop […]
The post Coffee Break – Show 4 appeared first on Packet Pushers.
Coffee Break – Show 4
[player] This week Andrew & Greg are joined Howard Marks whose abundance of commentary leads to a surfeit of opinions on the lack of anything happening at Mobile World Congress. Show Notes MWC – Wearable computing on the rise? Netflix and Comcast: Is this the first Network Neutrality domino to fall? Frontier customer complaints drop... Read more »INTER-AS VPNs and Carrier Supporting Carrier (CSC) Part-2
In the first article of this series I mentioned from Inter AS VPN Option A only. This article will be about Option B , C and Carrier Supporting Carrier VPNs. I assume from the readers basic knowledge of these VPNs.Only design points will be highlighted here since my intended audiences are the network designers and […]
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The post INTER-AS VPNs and Carrier Supporting Carrier (CSC) Part-2 appeared first on Packet Pushers Podcast and was written by Orhan Ergun.
Has SDN Changed Networking?
Software Defined Everything, NFV, OpenFlow, SDDC and Orchestrators are buzz words of DC networking. An interesting point would be to check whether these proposed solutions change our understanding of DC Networks? A good analogy to start with is chassis based switches (e.g Cisco’s Cat6500, Juniper’s EX8200). Regardless of how convoluted it may seem, any networking […]
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The post Has SDN Changed Networking? appeared first on Packet Pushers Podcast and was written by Karim Jamali.