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EVPN

  • DHCP smart relay in an EVPN-VXLAN deployment (QFX5110, QFX5120, QFX5130, QFX10002, QFX10008, and QFX10016)—Starting in Junos OS Release 21.3R1, we support DHCP smart relay in an EVPN-VXLAN deployment. DHCP smart relay provides redundancy and resiliency to DHCP relay. It allows the relay agent to use multiple IP addresses as the gateway address when forwarding client requests to a DHCP server.

    [See DHCP Smart Relay for EVPN-VXLANDHCP Smart Relay for EVPN-VXLAN.]

  • Disable MAC learning on VXLAN interfaces (QFX5110 and QFX5120-48Y)—Starting in Junos OS Release 21.3R1, you can disable MAC learning in a VXLAN. By default, MAC learning is enabled, and the VTEPs (VXLAN tunnel endpoints) learn the MAC addresses of:

    • Remote hosts from.the VTEPs on the remote VTEP list
    • Local hosts from. the local access interfaces

    After the VTE learns the MAC address of a host, it adds the address to the Ethernet switching table. When you disable MAC learning on specific physical interfaces or VLAN interfaces in a VXLAN, the VTEPs are unable to learn the source and destination MAC addresses. Instead, the VXLAN receives a flood of packets that the device sends to any destination addresses.

  • Layer 3 VXLAN gateway support in EVPN-VXLAN fabrics using a RIOT loopback port (QFX5210)—Starting in Junos OS Release 21.3R1, you can configure a QFX5210 switch as a Layer 3 VXLAN gateway for unicast traffic in an EVPN-VXLAN edge-routed bridging overlay fabric. QFX5210 switches require a special intermediary port for routing in and out of VXLAN tunnels (RIOT). You configure the RIOT port as a loopback LAG bundle that enables inter-VLAN routing with VXLAN tunnel initiation or termination. The RIOT loopback LAG port must be a member of all VXLAN VLANs with IRB interfaces. This feature supports:

    • Only MAC-VRF routing instances with either VLAN-based or VLAN-aware bundle service types.
    • Enterprise-style interface configuration.
    • EVPN asymmetric Type 2 routes and EVPN Type 5 routes.

    [See Using a RIOT Loopback Port to Route Traffic in an EVPN-VXLAN Network.]

  • Seamless EVPN-VXLAN stitching with MAC-VRF routing instances (QFX10002, QFX10008, and QFX10016)—Starting in Junos OS Release 21.3R1, we support seamless stitching of unicast routes across EVPN-VXLAN data centers through a WAN using MAC VRF routing instances. You can use this feature between data centers (data center interconnect [DCI]) or between points of delivery (PODs) within a data center. The EVPN control plane stitches the EVPN routes from the PODs or data centers and the WAN into a single customer-specific MAC forwarding table.

    On each interconnection device, configure:

    • A customer-specific EVPN instance (EVI) of type mac-vrf.

    • Elements in the [edit routing-instances protocols evpn interconnect] hierarchy in the EVI to enable the interconnection.

    [See interconnect and MAC-VRF Routing Instance Type Overview.]