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default-gateway

Hierarchy Level

Description

Specify the behavior for IRB interfaces defined as default gateways in an EVPN fabric.

We require that you configure the no-gateway-community option if you configure a virtual gateway address on an IRB interface in the EVPN routing instance for IPv4 or IPv6 using the following commands:

  • set interfaces irb unit unit-number family inet address ipv4-address virtual-gateway-address ipv4-vga

  • set interfaces irb unit unit-number family inet6 address ipv6-address virtual-gateway-address ipv6-vga

To configure the no-gateway-community option when you configure an IRB interface with a virtual gateway address:

  • On supported platforms, you can configure the no-gateway-community option globally:

    set protocols evpn default-gateway no-gateway-community

  • On platforms that don't support the no-gateway-community option at the global level (such as MX Series routers), configure no-gateway-community at the EVPN routing instance level in each EVPN instance with an IRB virtual gateway address configured:

    set routing-instances routing-instance-name protocols evpn default-gateway no-gateway-community

See Anycast Gateways for more on virtual gateway addresses with EVPN-MPLS. See Example: Configuring a QFX5110 Switch as Layer 2 and 3 VXLAN Gateways in an EVPN-VXLAN Edge-Routed Bridging Overlay for an example configuration in an EVPN-VXLAN fabric with a virtual gateway.

In an EVPN-VXLAN environment with multihoming, you might use multiple EVPN routing instances on peer provider edge (PE) devices that share an Ethernet segment (ES). When you configure anycast gateways with this statement, we don’t support mixing the default behavior (same as the advertise option) with the no-gateway-community option on the links that participate in the same ES.

As a result, if you configure the default-gateway statement with the no-gateway-community option in any EVPN routing instances on any peer PE device that share an ES, you must configure this statement:

  • In all the routing instances that share the ES on a PE device,

  • On all the peer PE devices that share the ES,

  • Only with either the no-gateway-community option or the do-not-advertise option.

Options

advertise Advertise the default gateway MAC address. This is the default behavior.
do-not-advertise Don't advertise the default gateway MAC address.
no-gateway-community Advertise virtual gateway addresses and IRB MAC addresses to EVPN peer devices so that Ethernet-only PE devices learn those MAC addresses. See Description for more details on when to use this option.

Related Documentation