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proxy-macip-advertisement

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 15.1X53-D60 for QFX Series switches.

Description

Enable the proxy advertisement feature on a QFX Series switch that can function as a Layer 3 gateway. With this feature enabled, the Layer 3 gateway advertises the MAC and IP routes (MAC+IP type 2 routes) on behalf of Layer 2 VXLAN gateways.

In an Ethernet VPN-Virtual Extensible LAN (EVPN-VXLAN) centrally-routed bridging overlay (EVPN-VXLAN topology with a two-layer IP fabric), spine devices typically function as Layer 3 VXLAN gateways, and leaf devices typically function as Layer 2 gateways. In this overlay network, the Layer 2 VXLAN gateways can advertise only the MAC routes (EVPN type 2 routes) for the attached hosts. Since the Layer 2 gateways are unable to resolve the MAC-to-IP bindings for the hosts, each of the Layer 3 gateways rely on the Address Resolution Protocol (ARP) and the Neighbor Discovery Protocol (NDP) to discover and install the bindings.

For example, after a Layer 3 gateway receives a host MAC route advertisement from a Layer 2 gateway, and ARP and NDP resolve the MAC-to-IP bindings, the Layer 3 gateway in turn advertises the host MAC and IP routes along with the next hop, which is set to the Layer 2 gateway to which the host is attached. Upon receipt of this advertisement, Layer 2 and 3 gateways in the topology install the MAC-to-IP bindings along with the associated next hops. When any of these gateways receives a packet with a destination MAC that matches an address in its MAC table, the gateway can check the next hop associated with the MAC address and forward the packet directly to the Layer 2 gateway to which the host is attached. This resulting packet flow eliminates the need for the packet to be forwarded first to a Layer 3 gateway, which then forwards the packet to the Layer 2 gateway.

Enabling this feature in a centrally-routed bridging overlay is required. We recommend that you not use this feature in an EVPN-VXLAN edge-routed bridging overlay (EVPN-VXLAN topology where the IP fabric is collapsed into a single layer of QFX Series switches that function as both Layer 2 and Layer 3 VXLAN gateways). Doing so can result in IP reachability issues in your edge-routed bridging overlay.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.