Cisco IOS XE: Настройка BGP EVPN VXLANv6. Руководство по миграции и развертыванию (EN)

Information About BGP EVPN VXLANv6

Configuring BGP EVPN VXLANv6 This document describes new deployment and migration scenarios for implementing IPv6 in the underlay of a BGP EVPN VXLAN fabric. Restrictions for BGP EVPN VXLANv6, on page 1 Information About BGP EVPN VXLANv6 , on page 1 How to Configure BGP EVPN VXLANv6, on page 3 Migration from VXLANv4 to VXLANv6, on page 6 Configuration Examples for BGP EVPN VXLANv6, on page 10 Restrictions for BGP EVPN VXLANv6 • Optimized Layer 2 overlay multicast is not supported in BGP EVPN VXLANv6. • BGP EVPN VXLANv6 does not support centralized anycast gateway deployment. Only distributed anycast gateway is supported. • BGP EVPN VXLANv6 does not support the following features:

• Multi-Homing • Access Virtual Forwarding Interface (VFI) • Fabric Netflow Information About BGP EVPN VXLANv6 The ever-expanding needs of the enterprise networks to enhance the IP addressing capabilities and simplify the network configurations makes it pertinent to adopt IPv6-enabled networks. The larger IPv6 address space allows networks to scale and provide global reachability. The simplified IPv6 packet header format handles packets more efficiently. IPv6 prefix aggregation, simplified network renumbering, and IPv6 site multihoming capabilities provide an IPv6 addressing hierarchy that allows for more efficient routing.

When you enable IPv6 in the underlay for VXLAN tunnel endpoints (VTEPS), the overlay traffic is encapsulated with the IPv6 VXLAN encapsulation. IPv6 connectivity between the VTEPS is established by enabling IPv6 unicast routing protocols. For overlay multi-destination traffic (BUM), when underlay multicast is used, IPv6 multicast protocol must be enabled. Configuring BGP EVPN VXLANv6 1

Стр. 1

EVPN VXLANv6 Layer 2 Overlay

For a new deployment, you can build your BGP EVPN VXLAN fabric with IPv6 underlay. For an existing BGP EVPN VXLAN fabric with IPv4 underlay, you can seamlessly migrate to an IPv6 only or dual stack underlay. BGP EVPN VXLANv6 Fabric Support In Cisco IOS XE Dublin 17.10.1 and later releases, a BGP EVPN VXLAN fabric with an IPv6 underlay supports the following features:

• Ingress Replication or Static Multicast Replication • Layer 2 Gateway • Distributed Anycast Gateway with Symmetric Integrated Routing and Bridging • Layer 2 External connectivity with IEEE 802.1Q network • Layer 3 External Connectivity with VRF-Lite or MPLS Layer 3 VPN network • Seamless migration between EVPN VXLANv4 fabric and EVPN VXLANv6 fabric • IPv6 BGP EVPN Neighbor Peering EVPN VXLANv6 Layer 2 Overlay The Layer 2 Gateway with VXLANv6 deployment supports IPv6 transport in the underlay. The VXLAN tunnels and BGP peering between Layer 2 Gateways are both IPv6 based. The overlay has only Layer 2 routes. A Layer 2 Gateway with VXLANv6 supports Layer 2 bridging between Layer 2 Gateways.

Layer 3 Routing is implemented with the external Layer 3 Gateways. Figure 1: EVPN VXLANv6 Fabric with Layer 2 Gateway The topology in the figure shows a BGP EVPN VXLAN fabric with a Layer 2 overlay that supports IPv6 underlay. The fabric supports both IPv4 and IPv6 hosts. Configuring BGP EVPN VXLANv6 BGP EVPN VXLANv6 Fabric Support Configuring BGP EVPN VXLANv6 2

Стр. 2

Configure VXLANv6 for BGP EVPN Fabric with Layer 2 Overlay

EVPN VXLANv6 Overlay with Distributed Anycast Gateway In a BGP EVPN VXLANv6 fabric with Distributed Anycast Gateway, the underlay supports IPv6 transport. The VXLAN tunnels and BGP peering, both support IPv6 addressing. The overlay has both Layer 2 and Layer 3 routes and supports MAC, IPv4 and IPv6 addressing. Distributed Anycast Gateway with VXLANv6 supports Layer 2 bridging, Layer 3 routing within the EVPN fabric, and Layer 3 stitching through Layer 3 border gateway with IPv6 underlay. For Layer 3 routing, both IPv4 and IPv6 overlay prefixes are supported over IPv6 underlay. Figure 2:

BGP EVPN VXLANv6 Fabric with Distributed Anycast Gateway Topology in the figure shows a BGP EVPN VXLANv6 fabric with integrated routing and bridging (IRB) using distributed anycast gateway (DAG). The fabric supports both IPv4 and IPv6 hosts, and IPv6 BGP peering. How to Configure BGP EVPN VXLANv6 This section describes only the changes in the underlay configuration. For the overlay and complete configuration of the fabric, refer How to Configure EVPN VXLAN Layer 2 Overlay Network and Information About EVPN VXLAN Integrated Routing and Bridging .

Configure VXLANv6 for BGP EVPN Fabric with Layer 2 Overlay Implement the following tasks to configure IPv6 underlay for a BGP EVPN VXLAN fabric with Layer 2 overlay. Procedure Step 1 Configure an explicit router-id for L2VPN EVPN. Configuring BGP EVPN VXLANv6 EVPN VXLANv6 Overlay with Distributed Anycast Gateway Configuring BGP EVPN VXLANv6 3

Стр. 3

Configure VXLANv6 for BGP EVPN Fabric with Distributed Anycast Gateway

l2vpn router-id 1.1.1.3 l2vpn evpn replication-type ingress end Step 2 Configure an L2EVPN instance. l2vpn evpn instance 1 vlan-based encapsulation vxlan Step 3 Configure Loopback interface. interface Loopback1 ipv6 address ABCD:1::2/128 ipv6 ospf 1 area 0 Step 4 Configure NVE interface. interface nve1 source-interface Loopback1 host-reachability protocol bgp vxlan encapsulation ipv6 member vni 20011 ingress-replication member vni 20012 mcast-group FF0E::12 Step 5 Configure the VLAN. vlan configuration 11 member evpn-instance 1 vni 20011 Step 6 Configure the L2VPN EVPN BGP peering. interface Loopback0 description BGP UPDATE SOURCE ipv6 address ABCD:1::1/128 ipv6 ospf 1 area 0 !

router bgp 100 bgp router-id 1.1.1.1 bgp log-neighbor-changes bgp graceful-restart neighbor ABCD:99::99 remote-as 100 neighbor ABCD:99::99 update-source Loopback0 ! address-family l2vpn evpn neighbor ABCD:99::99 activate neighbor ABCD:99::99 send-community both exit-address-family ! Configure VXLANv6 for BGP EVPN Fabric with Distributed Anycast Gateway Implement the following tasks to configure IPv6 underlay for a BGP EVPN VXLAN fabric with a Distributed Anycast Gateway (DAG). Configuring BGP EVPN VXLANv6 Configure VXLANv6 for BGP EVPN Fabric with Distributed Anycast Gateway Configuring BGP EVPN VXLANv6 4

Стр. 4