Artyom, > Could someone please explain to me why VxLAN L3-mode was inverted here? > https://gerrit.fd.io/r/c/vpp/+/34721 > > The 'isL3' argument in api or 'l3' in CLI means "use this in L3 mode", > doesn't it? > > This looks confusing, because we set L3 but the tunnel has MAC-address: > DBGvpp# create vxlan tunnel src 10.0.3.1 dst 10.0.3.3 vni 55 l3 > vxlan_tunnel0 > DBGvpp# show hardware-interfaces > Name Idx Link Hardware > local0 0 down local0 > Link speed: unknown > local > vxlan_tunnel0 1 up vxlan_tunnel0 > Link speed: unknown > Ethernet address 02:fe:66:da:01:d5
VXLAN emulates an Ethernet LAN on top of an IP infrastructure. VXLAN will always carry an inner Ethernet header, and therefore the virtual VXLAN interface will have a MAC address. The L3 mode distinguishes between attaching the VXLAN interface to VPP as a bridge or VPP as a router. In L2 mode: pass inner Ethernet frame to bridge code. In L3 mode: decap inner Ethernet frame and pass IP packet to ipX-lookup. (And don't get me started on why I think LAN emulation is a stupid thing). Best regards, Ole
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