BGP-EVPN for the Data Center and L3 DCI. Mayur Shetty Pratima Kini November 30, 2015
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1 BGP-EVPN for the Data Center and L3 DCI Mayur Shetty Pratima Kini November 30, 2015
2 Agenda What is EVPN? What problems does VXLAN solve? What problems does BGP EVPN solve? Overview of BGP EVPN Route Types and associated use cases Host IP/MAC distribution IP Prefix route Layer-3 DCI L3 handoff between VXLAN-EVPN and MPLS-L3VPN to extend the layer-3 network connectivity across Data Centers over a WAN 2
3 What is E-VPN? Ethernet VPN (EVPN) connect a group of customer sites using a virtual bridge. Treat MAC addresses as routable addresses and distribute them in BGP Uses Multi-protocol BGP Initially started as next generation L2VPN solution for service provider networks Evolution of EVPN Data center use cases Multi-tenancy with virtualized hosts Support of VXLAN and NVGRE encapsulations Integrated routing and bridging Support exchange of IP addresses and IP prefixes Status of EVPN Standardization effort - IETF L2VPN work group Multi-vendor support core set of drafts co-authored by engineers from Cisco, Juniper, Alcatel-Lucent, Verizon, ATT, Bloomberg. BGP MPLS based EVPN is RFC 7432 and extensions for DC is currently in draft stages. 3
4 Why What VXLAN problems? does VXLAN solve? Customer Needs Any workload anywhere VLANs limited by L3 boundaries VM Mobility Scale above 4k Segments (VLAN limitacon) Secure MulC- tenancy VXLAN Enables Any Workload anywhere- across Layer 3 boundaries Seamless VM Mobility Scale up to 16M segments Traffic & Address IsolaCon VXLAN Overlay VTEP VTEP VTEP VTEP VTEP 4
5 Challenges with VXLAN Deployments Challenges with VXLAN Deployments New Scale and Mobility Limitations VXLAN Overlay VTEP VTEP VTEP VTEP VTEP LIMITED SCALE Flood and learn (BUM)- Inefficient Bandwidth Utilization Resource Intensive Large MAC Tables CENTRALIZED Centralized Gateways, Controller Traffic Hair-pining Sub-Optimal Traffic Flow Barrier for Scaling out Large Data Centers and Cloud Deployments 5
6 What problems does BGP EVPN solve for VXLAN? Control plane for VXLAN overlays Optimize/eliminate flooding of Unknown unicast traffic. Protocol messages, e.g. ARP Virtual machine mobility with optimal forwarding No hair pinning of traffic to previous location Active/active multi-homing with per flow load balancing Large scale multi-tenancy in control plane with characteristics of L3VPN Route filtering and constrained route distribution Ingress replication of multi-destination traffic Multicast free underlay 6
7 BGP-EVPN / VXLAN Terminology 1. Layer-2 VNI VNI (VXLAN network identifier) carried in VXLAN packets bridged across VTEPs (VXLAN tunnel end point). This VNI is configured per VLAN. 2. Layer-3 VNI VNI carried in the VXLAN packets routed across VTEPs. This VNI is linked per Tenant VRF. 3. Anycast GW All L3 VTEPs are configured with same mac and same subnet for host facing SVI. 4. VRF overlay VLAN Every Tenant VRF will need a Vlan to be configured for VXLAN routing. This VLAN is configured with L3-VNI. 5. VXLAN L2 Gateway VTEP capable of switching VLAN->VXLAN, VXLAN->VLAN packets with in same VNI. 6. VXLAN L3 Gateway VTEP capable of routing packets across different VNIs. 7
8 MP-BGP EVPN Control for VXLAN Plane EVPN Reachability Control Plane Distribution EVPN Control Plane -- Host and Subnet Route Distribution ibgp Adjacencies RR RR Spine RR Route-Reflectors deployed for scaling purposes VTEP VTEP VTEP VTEP Leaf BGP Update Host-MAC Host-IP Internal IP Subnet External Prefixes Use MP-BGP with EVPN Address Family on leaf nodes to distribute internal host MAC/IP addresses, subnet routes and external reachability information MP-BGP also used to distribute IP multicast groups information MP-BGP enhancements to carry up to 100s of thousands of routes with reduce convergence time 34 8
9 BGP EVPN Route Types Route-Type EVPN Routes Purpose 1 Ethernet Auto-discovery Route Mass withdrawal and Aliasing 2 MAC/IP Route Advertise host MAC and IP address 3 Inclusive Multicast Route Tunnel end point discovery for setting up of replication list 4 Ethernet Segment Route Discovery of nodes in redundancy group and DF-election 5 IP Prefix route Advertise IP prefixes 9
10 BGP EVPN MAC Route (Type 2 Route) RD: MAC Len: per VPN RD 48 MAC Addr: Host-MAC IP Length: IP address: 32 Host-IP Label1: VNI for BD Label2: VNI for VRF Route Target RT for EVI RT for VRF Tunnel Attribute Tunnel Type VXLAN MAC: Router MAC MAC Mobility Sequence Number 10
11 BGP EVPN Control Plane for VXLAN L2 Overlay (Type-2 Route) BGP EVPN MAC_H1: VNI 1 MAC_H2: VNI 2 Bridged Traffic VXLAN encaps in VNI1, 2 L3 Underlay BGP EVPN MAC_H3: VNI 1 MAC_H4: VNI 2 TOR 1 VXLAN Tunnel TOR 2 Vlan 1 Vlan 2 (VNI 1) (VNI 2) Vlan 1 Vlan 2 (VNI 1) (VNI 2) MAC_H1 MAC_H2 MAC_H3 MAC_H4 Advertisement of MAC:VNI bindings from a TOR via BGP EVPN enables a remote TOR to send bridged traffic to that MAC using the VNI for that MAC to the TOR that advertised the MAC over VXLAN 11
12 BGP EVPN Control Plane for VXLAN L3 Overlay (Type-2 Route) BGP EVPN IP_H1: VNI 3 IP_H2: VNI 3 Routed Traffic VXLAN encaps in VNI 3 L3 Underlay BGP EVPN IP_H3: VNI 3 IP_H4: VNI 3 TOR 1 VRF 1 VNI3 VXLAN Tunnel TOR 2 VRF 1 VNI3 IP_H1 IP_H2 IP_H3 IP_H4 Advertisement of IP:VNI bindings from a TOR via BGP EVPN enables a remote TOR to send routed traffic to that IP using the VNI for that IP to the TOR that advertised the IP over VXLAN 12
13 BGP EVPN IP Prefix Route (Type 5 Route) RD: VRF RD Ethernet Segment: 0 Ethernet Tag: 0 IP Address Len: 0-32 IP Address: IP prefix GW IP Address: 0 Label : L3 VNI Route Target RT for VRF Tunnel Attribute Tunnel Type VXLAN MAC: Router MAC 13
14 BGP EVPN Control Plane Type-5 Route IP Prefix Route: Prefix : /24 VNI : L3 VNI Next Hop : IP-L1 Router MAC : System MAC of Leaf1 Spine1 Spine2 Leaf1 Leaf2 Leaf3 Leaf4 L3 VNI L3 VNI L3 VNI Subnet /24 14
15 DCI Overview L3 DCI Service: EVPN-VXLAN to IP VPN (unicast) Interworking on DCI L2 DCI Service: EVPN-VXLAN to VPLS Interworking on DCI EVPN-VXLAN to OTV Interworking on DCI EVPN-VXLAN to EVPN-MPLS Interworking on DCI DC1 Spine Leaf Leaf bleaf bleaf DCI EVPN-VXLAN IPVPN Interworking WAN IPVPN DCI OTV or EVPN w seamless VPLS interworking DCI Client DC2 15
16 L3 DCI Service EVPN ebgp ibgp ebgp DC Spine Leaf Leaf BLeaf BLeaf EVPN EVPN Route Type 5: RD Prefix Label = VRF-VNID RT NH = VTEP- IP Tunnel ENCAP = VXLAN Ext Comm Adr: RMAC DCI IPVPN RD Prefix MPLS label RT NH RD Prefix MPLS label IPVPN WAN P E C E Client VNID: per-vrf encap, downstream assigned by BL and DCI MAC: next-hop router MAC (BL, DCI) NH: VTEP IP (BL, DCI) RT: coordinated between each DCI-BL pair ENCAP: VXLAN 16
17 L3 DCI Service Control Plane Prefix /24 MAC: bleaf-mac VRF-VNI: 101 NH: VTEP-BL RT: ASN:X ENCAP: VXLAN DC1 DCI/WAN Prefix /24 MPLS label: Client Host E: Host A: Spine WAN Prefix /24 MPLS label: Leaf Leaf bleaf bleaf Fabric can advertise aggregated prefix and specific host route to WAN WAN router will typically advertise default route into fabric Prefix /0 MAC: DCI-MAC VRF-VNI: 102 NH: VTEP-DCI RT: ASN:X ENCAP: VXLAN Prefix /24 MPLS label: per-vrf VNI assignment VNI is local router significant and assigned by downstream router just like MPLS VPN label Ingress and egress VNIs can be different for same VRF RT is unique per-vrf between fabric and WAN as the glue MAC is next-hop router MAC which could advertised global per-vtep or per-vni / VRF NH is set to VTEP IP ENCAP is set to VXLAN 17
18 L3 DCI Service DCI Forwarding Plane 1. WAN -> Fabric MPLS Packet Label lookup per-vrf Label -> VRF VRF FIB lookup VXLAN ENCAP (VRF-VNI) VXLAN Packet per-prefix 2. Fabric -> WAN VXLAN Packet VNI lookup VNI -> VRF VRF FIB lookup L3VPN MPLS ENCAP MPLS Packet 18
19 References VXLAN: A framework for overlaying Virtualized Layer 2 Networks over Layer 3 Networks -- RFC 7348 Ø BGP MPLS based EVPN -- RFC 7432 Ø Requirements for Ethernet VPN (EVPN) Ø A Network Virtualization Overlay Solution using EVPN Ø 18
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