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Software-Defined Networking (SDN)

  • Configure SLCs and assign them to GNFs (MX2010 and MX2020)—Starting in Junos OS Release 21.1R1, in an external server-based Junos node slicing setup, you can additionally configure logical partitions (called sub line cards or SLCs) of the MX2K-MPC11E line card and assign each partition to different guest network functions (GNFs). See Sub Line Card Overview for details. You can create two SLCs on an MX2K-MPC11E. An SLC functions like an independent line card.

    In Junos OS Release 21.1R1, SLCs do not support handling of failures of links between Control Boards and the server, graceful Routing Engine switchover on BSYS and GNF, and unified in-service software upgrade.


    In Junos OS Release 21.1R1, Junos node slicing is not multi-version interoperable with previous releases of Junos OS (whether or not SLCs are configured). So, for any GNF in a node-sliced system to run Junos OS Release 21.1R1, all other GNFs and BSYS must also run Junos OS Release 21.1R1.

    [See Configuring Sub Line Cards and Assigning Them to GNFs.]

  • Support for ECMP on multiple flexible routes (MX Series routers with MPC10 and MPC11 line cards)—Starting in Junos OS Release 21.1R1, MX Series routers with MCP10 or MPC11 line cards support traffic load balancing over multiple flexible routes with 64-way ECMP. A flexible route is a static route with a tunnel encapsulation profile that has the flexible tunnel interface (FTI) attribute. Multiple flexible routes can go through the same logical interface. You can install flexible routes on Juniper gateway devices using Juniper Extension Toolkit (JET) APIs.

    When the router receives a packet with the flexible route as the destination address, it processes the packet using the profile associated with a flexible route, and load-balances the traffic across multiple flexible routes based on the traffic priority.

    Use the show route and show route extensive CLI commands or the get-route-information RPC/NETCONF command to view details about a flexible route for a destination address.

    [See Understanding Programmable Flexible VXLAN Tunnels.]