EVPN MPLS VLAN-Based Configuration

Configuration examples of VLAN-Based EVPN service using MPLS Dataplane Encapsulation in Segment Routing-Enabled Juniper Network.

Complete Configuration Repository on GitHub:

Continue reading “EVPN MPLS VLAN-Based Configuration”

Segment Routing Cisco – Juniper Interop Design

Cisco and Juniper Segment Routing Interoperability design with configuration examples.  IS-IS based IGP topology.

Complete configuration repository on GitHub: https://github.com/bgphelp/blueprints/tree/master/1-SR-Cisco-Juniper


Continue reading “Segment Routing Cisco – Juniper Interop Design”

LDP to Segment Routing (also known as SR and SPRING) Migration Steps

Step-by-step migration from LDP-based design to Segment Routing topology in Juniper environment.  In this example, we will be using IS-IS as IGP protocol. 
Continue reading “LDP to Segment Routing (also known as SR and SPRING) Migration Steps”

Migrating to BGP-Free Core in Juniper Environment

Discussion on how to migrate to BGP-Free Core by deploying MPLS as network tunneling mechanism. Document provides step-by-step migration steps for a Juniper-based network.  
Continue reading “Migrating to BGP-Free Core in Juniper Environment”

Juniper High Availability Customer Site using AS-Prepend

Configuring Dual-CE BGP High Availability Site. This article provides Juniper Configuration Example that uses BGP AS-Prepend to identify primary and secondary paths.
Continue reading “Juniper High Availability Customer Site using AS-Prepend”

BGP Next-Hop Self Explained

One of the common questions asked by people who begin their BGP journey is related to BGP ‘Next-Hop Self’ configuration option. What does it do? Should I use it on my network? What will happen if I forget to configure it? Today we’ll try to answer these questions.
Continue reading “BGP Next-Hop Self Explained”

BGP Looking Glass

Brief introduction into Public BGP Looking Glass servers and how to use them to troubleshoot real-life issues. 

One of the most common tasks performed by BGP administrator is troubleshooting of prefix propagation over the Internet. You might have originated a prefix advertisement from within your Autonomous System, but was this prefix accepted by your Upstream Peers? If it was, did your Transit peers propagate this information to the global Internet, or did the prefix get lost or summarized somewhere within their networks because you might set a wrong community? Is it possible that your prefix has been hijacked by somebody else?
Public Looks Glass (LG) and Router-Servers (RS) allow you to get an answer to these questions in a matter of seconds.
Continue reading “BGP Looking Glass”

Advertising Aggregates Routes

As a BGP admin, you will often need to make decisions on the ways to partition your IP Space, which routes to advertise to the Internet and which routes to suppress.

Ideally, you’d want to aggregate your IPv4/IPv6 Space as much as possible, by only advertising aggregate prefixes (also known as supernets and summary routes) to the Internet. Practically, this would mean that your Autonomous System (AS) will originate IP prefixes assigned to you by Regional Internet Registries (RIRs) or delegated to you by Upstream Providers, while suppressing all other advertisements. If everybody were to follow this rule, the Internet routing table would be much smaller and we would not have issues with FIB exhaustion.
Continue reading “Advertising Aggregates Routes”