• Learning YANG

    Modules YANG Base Types Typedef Type Restrictions Union Statement Common YANG types Grouping Statement Grouping Statement with Refine YANG Data Definitions Leaf Statement Container Statement Leaf-list Statement List Statements Attributes of list an leaf-lists Keys Multiple Keys Leafref Multiple Key Leafref Deref() XPATH Operator Another DEREF() Example YANG Part 2...


  • Cisco NSO Learnings

    NCS Installation This lab exercise was conducted with nso-4.6.linux.x86_64.installer.bin It is advisable to use the same while following this document. Make sure Java 10 (not Open JDK) Installed java -version and ant are installed. Install NCS root@mininet-vm:/home/mininet# chmod +x nso-4.6.linux.x86_64.installer.bin root@mininet-vm:/home/mininet# ./nso-4.6.linux.x86_64.installer.bin /opt/ncs Setup NCS root@mininet-vm:/home/mininet# source /opt/ncs/ncsrc root@mininet-vm:/home/mininet# ncs-setup...


  • NSO Common Error Messages and their resolution

    Should be of type path-arg In this case make sure your XPATH does not have a hardcoded variable. yang/new_l2vpn.yang:60: error: bad argument value "/ncs:devices/ncs:device{PE11}/ncs:config/ios:interface/ios:GigabitEthernet{1}/ios:name", should be of type path-arg error: the leafref refers to non-leaf and non-leaf-list node yang/new_l2vpn.yang:38: error: the leafref refers to non-leaf and non-leaf-list node 'FastEthernet' in...


  • BGP with BFD on EVE-NG with CSR1000v

    BGP with BFD on EVE-NG with CSR1000v BFD (Bi-Directional Forwarding Detection) is a superfast protocol to detect link failures withing milliseconds or microseconds! Routing protocols have mechanism to detect link failures as well with HELLO like mechanism but is not good enough for convergence where technologies like VOIP is involved....


  • BGP EVPN Step by Step Configuration Example

    Introduction Lab Topology Methodology Building the Basic Configuration Out Building the Multicast Configuration Full Configuration SPINE-1 VTEP-1 VTEP-2 Troubleshooting Tips Introduction In this post I would like to introduce you the concepts of BGP EVPN from a 100ft view and give you some understanding of what it is and how...