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  • VXLAN tunnel UDP source port entropy to support ECMP load balancing in EVPN-VXLAN fabrics (PTX10001-36MR, PTX10004, PTX10008, and PTX10016)—Starting in Junos OS Evolved Release 21.4R1, these routers use a software-supported method to provide source port entropy for ECMP load balancing on a VXLAN tunnel in an EVPN-VXLAN fabric. To support ECMP load balancing across a VXLAN tunnel, the device selects source port values based on a hash of fields in the VXLAN UDP packet inner header.

    Before this release, these routers use the default hardware method that assigns only one UDP source port per VXLAN tunnel (based on the VXLAN egress port and the packet forwarding class).

    [See Load Balancing VXLAN Traffic.]