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BGP Stories

Large BGP Communities playground

Published on: 2016-09-15

Lately, in the IETF Inter-Domain Routing (idr) area, various efforts are going on to push a (IMHO) winning idea to solve a 32-bits-wide problem: standard BGP communities are no longer enough to describe routing policies which involve 4-byte ASNs.

BGP Implicit and Explicit Withdraw

Published on: 2019-01-02

BGP Implicit and Explicit Withdraw are important BGP messages. Understanding these two mechanisms not only help for understanding BGP convergence but also helps for BGP path diversity. While I was explaining BGP Add-Path in my Instructor Led CCDE course, I used the term 'BGP Implicit Withdraw' ...

Testing notes: simulating link failure by filtering BFD packets

Published on: 2018-12-28

In some testing I am doing, I need to prove that BFD can be used with iBGP to tell the BGP protocol when there is an interruption. This will enable BGP to be brought down much faster than if ...

vRealize Network Insight 4.0 – Smaller Gems

Published on: 2018-12-23

Network Insight 4.0 was released today and it undeniably the biggest release they're ever done. It's packed with some huge features and a lot of small goodness. While Karl has done an excellent job of describing the top features in this blog post, I'll go through the somewhat smaller features ...

GoBGP – A Control Plane Evolving Software Networking

Published on: 2016-03-29

If I have talked to you over the past year or two about networking, odds are I have mentioned a project to you called GoBGP. If we have spoken a lot, you are probably sick of me talking to you about GoBGP There is a reason, it’s because GoBGP is a missing link in networking that has been for a ...

L3 fabric DC -The underlay Network (BGP) -part2

Published on: 2017-01-17

In the previous post, we laid the foundation of L3 fabric DC In this post we will discuss the underlay network which mainly provide IP reachability plus ECMP capability, here BGP would play a role in your DC next to the 3 other that we discussed one of the previous posts.

Classic DC and M-LAG

Published on: 2016-08-29

In the pervious post we talked about BGP in Data Center and how it is a topic of discussion in between the DC and the SP arenas. In this post I will start explaining some classic DC design and laying its shortage which will engage the SP gurus with us, as well it will make sure ...

bgp – advertising multiple paths

Published on: 2014-02-07

Yes, it can be done by BGP. What was the question anyway? Path hiding on a route server running BGP can happen if the route server has been configured to filter the chosen best path from reaching a particular route server client. Assuming a traditional best path selection, when the same prefix ...

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