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MPLS Stories

Migration Strategy: Moving From MPLS/LDP to Segment Routing

Published on: 2019-03-21

MPLS core networks that use Label Distribution Protocol (LDP) are common in SP core networks and have served us well. So, the thought of pulling the guts out of the core is pretty daunting and invites the question why you would want to perform open-heart surgery on such critical infrastructure.

Pulling Configs from Cisco NSO using curl and json2yaml.py

Published on: 2019-03-14

We're using Cisco NSO in our lab at the moment to provision L3VPNs across multi-vendor environments as part of a demo. Just noting down a few things here for future reference: You can use the curl (command-line URL) utility to query NSO's API and retrieve the configuration of a device it knows ...

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' ...

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