In an Ethernet VPN-Virtual Extensible LAN (EVPN-VXLAN)centrally-routed bridging overlay (EVPN-VXLAN topology with a two-layerIP fabric), an MX Series router or a QFX10000 switch can functionas a Layer 3 VXLAN gateway on which you can configure integrated routingand bridging (IRB) interfaces. The configuration of each IRB interfacecan also include a virtual gateway address (VGA), which creates adefault Layer 3 virtual gateway with the specified IP address. Throughthe IRB interface with which it is configured, the default virtualgateway enables the communication between non-virtualized hosts, virtualmachines (VMs), and servers in different VXLANs or IP subnetworks.
When you configure a VGA for an IRB interface, the Layer 3 VXLANgateway automatically generates IPv4 media access control (MAC) address00:00:5E:00:01:01 or IPV6 MAC address 00:00:5E:00:02:01 for that particularvirtual gateway. (This topic refers to the virtual gateway MAC addressas a virtual MAC.) The automatically generatedvirtual MAC is not included as the source MAC address in packets generatedby the Layer 3 VXLAN gateway. Instead, data packets and the sourceMAC address field in the outer Ethernet header of Address ResolutionProtocol (ARP) replies and neighbor advertisement packets includethe MAC address for the IRB interface. (This topic refers to the MACaddress for the IRB interface as the IRB MAC.) Broadcom bcm20702 driver windows 10.
When an ARP reply includes the IRB MAC as the source MAC addressinstead of the virtual MAC, an issue might arise in a centrally-routedbridging overlay. For example, in the overlay network shown in Figure 1, an MX Series router anda QFX10000 switch function as Layer 3 VXLAN gateways, and four QFX5100switches function as Layer 2 VXLAN gateways. Also included in theoverlay network are three intermediary Layer 2 switches, in this case,EX4300 switches, to which hosts are connected.
On the MX Series router, an IRB interface named irb.1 has aMAC address of 00:05:85:00:53:01 and a VGA of 10.2.1.254. Control 4 license hack. The MX Seriesrouter automatically generates the MAC address 00:00:5e:00:01:01 forthe default virtual gateway.
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In this overlay network, irb.1 on the MX Series router receivesan ARP request from host 1. In its ARP reply, the MX Series routerincludes the following:
- Source MAC address in outer Ethernet header: 00:05:85:00:53:01(IRB MAC) → intermediary Layer 2 switch EX1 learns this MAC address.
- Sender MAC address within ARP reply packet: 00:00:5e:00:01:01(virtual MAC) → intermediary Layer 2 switch EX1 cannot see thisMAC address, and therefore, does not learn it.
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When intermediary Layer 2 switch EX1 receives the ARP reply,it learns only the source MAC address (IRB MAC). As a result, if host1 sends packets that include the virtual MAC in the header, EX1 isunable to find the virtual MAC in its MAC table. Therefore, EX1 floodsthe domain with unknown-unicast packets.
NoteThe flooding of unknown-unicast packets is not an issuein EVPN-VXLAN edge-routed bridging overlays (EVPN-VXLAN topologieswith a collapsed IP fabric), in which a single layer of QFX10000 switchesfunction as both Layer 3 and Layer 2 VXLAN gateways. In the edge-routedbridging overlay, hosts are directly connected to the Layer 3 andLayer 2 VXLAN gateways. Further, each IRB interface is typically configuredwith an IP address and a static MAC address. The configuration ofeach IRB interface on a particular VXLAN gateway is repeated on eachgateway in the edge-routed bridging overlay. With the same MAC addressconfigured for each IRB interface on each VXLAN gateway, each hostuses the same MAC address when sending inter-VXLAN traffic regardlessof where the host is located or which VXLAN gateway receives the traffic.These factors make the configuration of a default virtual gatewayunnecessary. For more information about the edge-routed bridging overlay,see Example: Configuring an EVPN-VXLAN Edge-Routed Bridging Overlay Within a Data Center.
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Starting with JunosOS Release 14.2R5 for MX Series routers and Junos OS Release 15.1X53-D63for QFX10000 switches, you can explicitly configure an IPv4 or IPv6MAC address for a default virtual gateway by using the virtual-gateway-v6-mac configuration statementat the name irb unit Juniper Vpn For Mac ComputerStarting with JunosOS Release 14.2R5 for MX Series routers and Junos OS Release 15.1X53-D63for QFX10000 switches, you can explicitly configure an IPv4 or IPv6MAC address for a default virtual gateway by using the virtual-gateway-v6-mac configuration statementat the name
irb unit