RT-1 routes are used to create a list of data center gateway VTEPs to be used as next hop by ESXi nodes. EVPN routes of type 1 (RT-1) are sent by the DC gateway to the tier-0 SRs when multiple data center gateways are configured as L2ECMP EVPN multihoming.EVPN routes of type 2 (RT-2) are exchanged between tier-0 SR and DC gateways to advertise MAC and IP/MAC bindings for RT-5 routes next hops.The IP prefixes learned from the VNF via the BGP IPv4/IPv6 unicast sessions are advertised as EVPN Route-Type 5 towards the external router with the corresponding VRF route distinguisher and route targets.BGP IPv4 session with L2VPN EVPN address family from tier-0 SR to the loopback of DC gateways.IP prefixes (RT-5) learned from the external router via the BGP EVPN session are injected in the tier-0 VRF routing table based on the route target policies and are advertised as IPv4/IPv6 unicast routes to the VNF.IP prefixes learned from the VNF via the BGP IPv4/IPv6 unicast sessions are advertised as EVPN Route-Type 5 towards the external route with the corresponding VRF route distinguisher and route targets.BGP IPv4 unicast and IPv6 unicast sessions from the VNF to the tier-0 VRF service ports.ESXi hypervisors exchange the user plane traffic directly with the data center fabric routers using VXLAN encapsulation, bypassing the edge node in the data path.įrom the BGP control plane perspective, there are two types of sessions: Session Typeīetween hosted VNFs and tier-0 VRF gateway. In the EVPN Route Server mode, the tier-0 service router (SR) hosted on the edge node acts as a BGP route server, establishing BGP control plane sessions with southbound VNFs and external data center routers.
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