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BGP

Lessons Learned in Cloud Networking – AWS vs Azure

I’ve been working a lot with cloud networking lately. I will share some of my findings as this is still quite new and documentation around some topics is poor. Especially on the Azure side. Let me just first start with

ddib April 1, 2019April 2, 2019 Cloud 18 Comments Read more

CCDE – Inter AS L3 VPNs

Introduction Sometimes a customer needs a L3 VPN between two locations where the same SP is not present. This can be on a national or international basis. It would be possible to buy an Internet circuit and run an overlay

ddib March 2, 2016March 14, 2016 BGP, CCDE, MPLS 7 Comments Read more

CCDE – BGP Confederations

Introduction BGP Confederations are one of two tools a network designer has to work around the full mesh requirement of iBGP. BGP confederations are defined in RFC 5065 which obsoletes RFC 3065. This is how the RFC defines BGP confederations:

ddib March 1, 2016 BGP, CCDE 4 Comments Read more

CCDE – BGP Convergence

Introduction This post will look at the steps involved in BGP convergence and how it interacts with IGP to converge. Any network of scale will use route reflectors (RRs) so this post will focus on deployments with RRs. Networks running

ddib February 25, 2016 CCDE 19 Comments Read more

Busting Myths – IPv6 Link Local Next Hop into BGP

In some publications it is mentioned that a link local next-hop can’t be used when redistributing routes into BGP because routers receiving the route will not know what to do with the next-hop. That is one of the reason why

ddib August 30, 2015 BGP, IPv6 3 Comments Read more

CCDE – Next Generation Multicast – NG-MVPN

MVPNs have been lacking support for MPLS encapsulation. NG-MVPN supports the use of MPLS encapsulation and provides a lot of different profiles. When is a profile suitable and which one should you choose?

ddib April 10, 2015November 8, 2015 CCDE, Multicast 16 Comments Read more

Noction Intelligent Routing Platform (IRP) – What is it?

I was contacted by some people at Noction and asked if I was interested in writing about their platform, the Intelligent Routing Platform (IRP). Since it’s a product that uses Border Gateway Protocol (BGP), it peaked my interest. First let’s

ddib January 27, 2015 Announcement 6 Comments Read more

Unique RD per PE in MPLS VPN for Load Sharing and Faster Convergence

This post describes how load sharing and faster convergence in MPLS VPNs is possible by using an unique RD per VRF per PE. It assumes you are already familiar with MPLS but here is a quick recap. The Route Distinguisher

ddib January 11, 2015 BGP, MPLS 6 Comments Read more

Some pointers on OSPF as PE to CE protocol

There was a discussion at the Cisco Learning Network (CLN) about OSPF as PE to CE protocol. I wanted to provide some pointers on using OSPF as PE to CE protocol. RFC 4577 describes how to use OSPF as PE

ddib February 23, 2014 BGP, MPLS, OSPF 5 Comments Read more

Scaling PEs in MPLS VPN – Route Target Constraint (RTC)

Introduction In any decent sized service provider or even an enterprise network running MPLS VPN, it will most likely be using Route Reflectors (RR). As described in a previous post iBGP fully meshed does not really scale. By default all

ddib September 23, 2013 BGP, MPLS 13 Comments Read more
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