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Note: The loopback interface used for the individual VTEP (PIP) must be advertised to the site-internal underlay as well as to the site-external underlay. IPsec provides security When a BGP EVPN VXLAN network is connected to an external network, the VXLAN traffic flows over the public network or internet, The configuration for a BGW with a site-external eBGP overlay is shown here. With this approach, on the control plane, prefixes originating at one site will never be imported back into the same site, thus preventing routing loops. About VxLAN over the internet markhui222 Beginner Options 02-18-2021 06:10 AM We have two sites and each site uses IPSec vpn over the internet as WAN link. The two primary topologies discussed here are the BGW-to-cloud model and the model with the BGW between the spine and superspine. One such deployment case is described in the Shared border section of this document, and one is described in the Legacy site integration section. The configuration of a shared border to a BGW with an eBGP overlay is shown here. This command is mandatory to enable the Multi-Site virtual IP address on the BGW. The BUM enforcement takes place before the traffic is reoriginated on the BGW for transmission to a remote site. BGP EVPN VXLAN over IPsec is supported only on the Cisco Catalyst 9300X Series switch. External connectivity includes the connection of the data center to the rest of the network: to the Internet, the WAN, or the campus. eBGP neighbor configuration is performed by specifying the source interface to loopback0. The same approach is followed for Layer 2 extension and MAC address advertisement, with advertisements sent to the site-external network only after the Layer 2 segment has been configured and associated with the VTEP. In an EVPN Multi-Site environment, the requirement for external connectivity is as relevant as the requirement for extension between sites. The documentation set for this product strives to use bias-free language. A Catalyst 9300X switch supports a maximum of 128 IPsec tunnels. As a result of the external connectivity configuration, you can route to an external domain, preventing the VXLAN BGP EVPN fabric from becoming a transit network and suppressing host-route advertisements. What is VXLAN? | Juniper Networks US This document considers the following major topologies: Although all of these designs look similar, you need to consider different factors when deploying them. VXLAN EVPN Multi-Site architecture is independent of the transport network between sites. Special considerations for Layer 2 extensions apply to BUM control and failure isolation, because the legacy site BGW (vPC BGWs) uses some different (and simplified) configurations given the absence of site-internal VTEPs. Site-internal BUM replication can use multicast (PIM ASM) or ingress replication. The VXLAN BGP EVPN connectivity between the BGW and the shared border requires a physical Layer 3 interface, as previously discussed for EVPN Multi-Site architecture. With EVPN Multi-Site interface tracking, the BGW function and advertisement and participation are controlled. These configuration knobs, including the source interface, can be combined in a BGP peer template. Based on the Internet Protocol (IP), VXLAN also has an UDP header and hence belongs to the IP/UDP-based encapsulations or tunnel protocols. However, this approach presents risk in the absence of failure isolation, particularly when large and stretched Layer 2 networks are built with this new overlay networking design. VxLAN simplifies the network by removing the spanning-tree protocol, trunking, and stretching VLAN's. Virtual machines can move in same VLAN's across layer 3 boundary. BGWs separate the fabric-side (site-internal fabric) from the network that interconnects the sites (site-external DCI) and mask the site-internal VTEPs. Note: Site-external EVPN peering is always considered to use eBGP with the next hop the remote site BGWs. VXLAN is a modern network protocol widely deployed in data center clouds, and the Sofware defined networking nowadays. This document focuses on the required configuration of the BGW that connects to the shared border. The route-server approach allows you to rein in the control-plane exchanges between all the BGWs across sites with a simplified peering model. Note: Without the route filter, the VXLAN BGP EVPN fabric can accidentally become a transit network for traffic external to the fabric. With this approach, only after the VRF instance is configured and associated with the VTEP is the relevant IP host and IP subnet prefix information advertised to the site-external network. The all-active connection of Layer 4 through Layer 7 (L4-L7) network services (for example, firewalls and load balancers) can be achieved through ECMP routing with a static or dynamic routing protocol. Note: The route server is not a VTEP or BGW and hence should not have the next hop pointing to itself. However, you can configure the L2 VPN service over IPSec tunnels only by using REST APIs. In the extended back-to-back topology, with the square plus the full mesh between the BGWs, ECMP is available. With the route reflector already present in the fabric, and with all VTEPs, including the BGW, peering with it, the exchange of designated-forwarder election messages is achieved (Figure 7). Skip to content. The host IP address is not especially important for the bridging itself, but it is needed to provide optimal routing between endpoints. In cases in which no route reflector exists, or in which the route reflector is not capable of relaying BGP EVPN Route Type 4, a iBGP session can be considered as an alternative. Site-internal and site-external interface status. Cisco NX-OS offers the route-server capability in the Cisco Nexus Family switches, which can be connected on a stick or within the data path as a node for the site-external underlay. After you set up a VXLAN BGP EVPN Multi-Site environment, you need the tools necessary to verify the current state. VXLAN over IPsec using a VXLAN tunnel endpoint | FortiGate / FortiOS 6.4.5 The SVI interface for the L3VNI must have an MTU of 9216? BGW back-to-back model (BUM traffic not acceptable). Configure the eBGP neighbor by specifying the source interface loopback0. Enable the IPv4 unicast address family for this peering. Multiprotocol-BGP (MP-BGP) peering with VPN address families is supported only as part of the default VRF instance. Learn more about how Cisco is using Inclusive Language. When using the BUM enforcement feature within the legacy site BGW, you can enforce aggregated rate limiting based on the well-known BUM traffic classes. Subsequent software releases will extend the capabilities to a BGW. Configure the iBGP neighbor by specifying the source interface loopback0. For the site-internal VTEP or leaf-to-leaf communication, the traffic pattern is through the BGW and spine combination. Define site-external underlay interfaces facing the external Layer 3 core with the shared border present. Assuming two BGWs per site, the back-to-back connectivity model builds a square between the two BGWs at the local site and the two BGWs at the remote site. This version is the minimum software release required for EVPN Multi-Site architecture. At least one of the physical interfaces that are configured with fabric tracking must be up to enable the Multi-Site BGW function (keeping the virtual IP VTEP address active). Hence the size of the BGP EVPN VXLAN fabric over IPsec tunnels In addition to the show commands presented in this section, VXLAN OAM (NGOAM) works consistently for single-site and EVPN Multi-Site architecture. Note: The use of an automated route distinguisher and route target is optional, but it is a best practice. The output now includes EVPN Multi-Site architecture configured and elapsed delay-restore time, the virtual router MAC address, and the virtual IP address and status. In the case of external connectivity, the shared border operates solely in Layer 3 mode, and hence no BUM replication between the BGW and shared border nodes is necessary. With the BGWs between the spine and superspine, data center fabrics are scaled by interconnecting them in a hierarchical fashion. The introduction of a Route Server (RS) can simplify the design and reduce the burden of having so many BGP peerings. Multisite bgw-if oper down reason: DCI isolated. In addition to using route peering to the external router through eBGP, you may sometimes want to advertise the default route to the fabric. Define a static default route to the next-hop IP address of the external router in the appropriate VRF instance. The route distinguisher for the IP VRF instance can be derived automatically by using the router ID followed by the internal VRF ID (RID:VRF-ID). Additional documentation about EVPN Multi-Site architecture and related topics can be found at the sites listed here. Therefore, every BGW has an active role in BUM forwarding. The original Virtual Extensible LAN (VXLAN) concept has been available for several years. The PIP address is also used in two additional scenarios that are closely related. In addition to verification of the state, control-plane protocol actions are performed as described in the Failure scenarios section. Define the BGP routing instance with a site-specific autonomous system. Apr 29, 2020 16 Dislike Share Save Kamran Shalbuzov 2.8K subscribers Configure Cisco VXLAN Between Three Sites in Unicast Mode over IPSec and load balancing with two ISP (Part2) Part1:. Note: Selective advertisement is defined by the configuration of the per-tenant information on the BGW. Define the neighbor configuration with the EVPN address family (L2VPN EVPN) for the site-internal overlay control plane facing the route reflector. Table 1. Specify EVPN Multi-Site interface tracking for the site-internal underlay (evpn multisite fabric-tracking). The SVI interfaces (Ex: vrf Tenant-1) for the servers must have MTU of 9216? With the disappearance of the BGW traffic to the site-internal network, the advertisements of this PIP address and the capability to participate in designated-forwarder election is removed. respective sections for more details on each of the following overlay network segmentations: Configure L2 overlay: Perform all the configuration tasks that are listed in Configuring EVPN VXLAN Layer 2 Overlay Network. It is a resource allocation setting only. The main difference is in the geographical radius of such a topology. With EVPN Multi-Site architecture and the BGWs, you can compartmentalize functional building blocks within the data center. Verify that the targeted leaf switch is supported in SDG Agent and the Layer 2 access switch is supported in Service-Peer mode. The approach of building a network over the top without touching every switch offers simplicity, and such a network can be extended across multiple locations. If the route reflector doesnt support BGP EVPN Route Type 4, direct BGW-to-BGW full-mesh iBGP peering must be configured. This step is mandatory if external connectivity for locally connected devices is required. Depending on the number of connections to the legacy network, the BGW may end up allowing more BUM traffic than is desired across the EVPN Multi-Site overlay. This approach enables successful export and import route-target matching by using automated route-target derivation with route-target rewrite. For instance, if the local site uses ASN 65501 and the remote site uses ASN 65520, the route targets will be misaligned, and no prefixes learned from the control plane will be imported. Note: Cisco NX-OS follows the following implementation as defined by IETF RFC-7342, draft-ietf-bess-evpn-overlay, draft-ietf-bess-evpn-prefix-advertisement, and draft-ietf-bess-evpn-inter-subnet-forwarding. BGP EVPN Route Type 4 is used for EVPN Multi-Site designated-forwarder election. Path MTU Discovery Commonly, an EVPN Multi-Site deployment consists of two or more sites, which are interconnected through a VXLAN BGP EVPN Layer 2 and Layer 3 overlay (Figure 4). Note: The hardware and software requirements for the site-internal BGP Route Reflector (RR) and VTEP of a VXLAN BGP EVPN site remain the same as those without the EVPN Multi-Site BGW. The VXLAN Border Gateway Protocol (BGP) EVPN fabric (or site) can be extended at Layer 2 and Layer 3 with various technologies. Define the loopback0 interface for the routing protocol router ID and overlay control-plane peering (that is, BGP peering). The iBGP peering must be EVPN address family enabled and have a full mesh established between the loopback interfaces of the BGWs. Note: As of Cisco NX-OS 7.0(3)I7(1), automated route-target derivation and route-target rewrite are limited to a 2-byte ASN. The EVPN Multi-Site architecture is based on IETF draft-sharma-multi-site-evpn. This setting allows underlay ECMP reachability from BGW loopback0 to route-reflector loopback0. The site-external overlay for VXLAN BGP EVPN must use eBGP, because the eBGP next-hop behavior is used for VXLAN tunnel termination and reorigination. If all fabric-tracking interfaces are reported to be down, the following steps are performed: The isolated BGW stops advertising the virtual IP address to the site-external underlay network. Configuring VXLAN EVPN Multi-Site architecture (Cisco Nexus 9000 Series Switches): https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/vxlan/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x_chapter_01100.html, Configuring VXLAN BGP EVPN (Cisco Nexus 9000 Series Switches): https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/vxlan/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x_chapter_0100.html, VXLAN EVPN configuration example (Cisco Nexus 9000 Series Switches): https://communities.cisco.com/community/technology/datacenter/data-center-networking/blog/2015/05/19/vxlanevpn-configuration-example, Cisco programmable fabric with VXLAN BGP EVPN configuration guide: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/pf/configuration/guide/b-pf-configuration.html, Building hierarchical fabrics with VXLAN EVPN Multi-Site architecture: https://www.cisco.com/c/dam/en/us/products/collateral/switches/nexus-9000-series-switches/at-a-glance-c45-739422.pdf, VXLAN innovations: VXLAN EVPN Multi-Site architecture (part 2 of 2): https://blogs.cisco.com/datacenter/vxlan-innovations-vxlan-evpn-multi-site-part-2-of-2, Design considerations and related references, The magic of superspines and RFC-7938 with overlays: https://learningnetwork.cisco.com/blogs/community_cafe/2017/10/17/the-magic-of-super-spines-and-rfc7938-with-overlays-guest-post, draft-sharma-multi-site-evpn - Multi-site EVPN based VXLAN using BGWs, https://tools.ietf.org/html/draft-sharma-multi-site-evpn, RFC-7432 (BGP MPLS-based Ethernet VPN): https://tools.ietf.org/html/rfc7432, draft-ietf-bess-evpn-overlay (network virtualization overlay solution using EVPN): https://tools.ietf.org/html/draft-ietf-bess-evpn-overlay, draft-ietf-bess-evpn-inter-subnet-forwarding (integrated routing and bridging in EVPN): https://tools.ietf.org/html/draft-ietf-bess-evpn-inter-subnet-forwarding, draft-ietf-bess-evpn-prefix-advertisement - IP Prefix Advertisement in EVPN, https://tools.ietf.org/html/draft-ietf-bess-evpn-prefix-advertisement, RFC-7947 (Internet exchange BGP route server): https://tools.ietf.org/html/rfc7947, BRKDCN-2035 (VXLAN BGP EVPNbased multipod, multifabric, and multisite architecture): https://www.ciscolive.com/online/connect/sessionDetail.ww?SESSION_ID=95611, BRKDCN-2125 (overlay management and visibility with VXLAN): https://www.ciscolive.com/online/connect/sessionDetail.ww?SESSION_ID=95613, Building data centers with VXLAN BGP EVPN (Cisco NX-OS perspective): https://www.ciscopress.com/store/building-data-centers-with-vxlan-bgp-evpn-a-cisco-nx-9781587144677, VXLAN BGP EVPN multifabric: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-738358.html, VXLAN BGP EVPN and OTV interoperation (Cisco Nexus 7000 Series and 7700 platform switches): https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/vxlan/config/cisco_nexus7000_vxlan_config_guide_8x/cisco_nexus7000_vxlan_config_guide_8x_chapter_01001.html, View with Adobe Reader on a variety of devices, https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/vxlan/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x_chapter_01100.html, https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/vxlan/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x_chapter_0100.html, https://communities.cisco.com/community/technology/datacenter/data-center-networking/blog/2015/05/19/vxlanevpn-configuration-example, https://www.cisco.com/c/en/us/td/docs/switches/datacenter/pf/configuration/guide/b-pf-configuration.html, https://www.cisco.com/c/dam/en/us/products/collateral/switches/nexus-9000-series-switches/at-a-glance-c45-739422.pdf, https://blogs.cisco.com/datacenter/vxlan-innovations-vxlan-evpn-multi-site-part-2-of-2, https://learningnetwork.cisco.com/blogs/community_cafe/2017/10/17/the-magic-of-super-spines-and-rfc7938-with-overlays-guest-post, https://tools.ietf.org/html/draft-ietf-bess-evpn-overlay, https://tools.ietf.org/html/draft-ietf-bess-evpn-inter-subnet-forwarding, https://www.ciscolive.com/online/connect/sessionDetail.ww?SESSION_ID=95611, https://www.ciscolive.com/online/connect/sessionDetail.ww?SESSION_ID=95613, https://www.ciscopress.com/store/building-data-centers-with-vxlan-bgp-evpn-a-cisco-nx-9781587144677, https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-738358.html, https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/vxlan/config/cisco_nexus7000_vxlan_config_guide_8x/cisco_nexus7000_vxlan_config_guide_8x_chapter_01001.html, Cisco Nexus 9000 and NX-OS: Open, Secure and Extensible, Cisco Nexus 9000 Series ThousandEyes Integration At-a-Glance. In this design, the only path available for the designated-forwarder exchange between the BGWs is through the site-internal VTEPs (leaf nodes). We need to create VXLan interface and bind it to ipsec tunnel one. acceleration. It is a transport network that allows reachability between all the EVPN Multi-Site BGWs and external VTEPs. The EVPN Multi-Site BUM enforcement feature can be useful. Ensure that the devices have the correct license to run IPsec and EVPN VXLAN. This flattening has both benefits and drawbacks. Using EVPN Multi-Site architecture, you can extend Layer 2 VNIs to enable seamless endpoint mobility and address other use cases that require communication bridged beyond a single site. Failure detection in the site-internal interfaces is one of the main mechanisms offered by EVPN Multi-Site architecture to reduce traffic outages. This approach allows simpler deployment as well as additional control right before traffic traverses the EVPN Multi-Site overlay. For configuration guidance for dual- and multiple-autonomous-system designs, see the For more information section at the end of this document. For fabrics, the spine and leaf, fat tree, and folded Clos topologies became essentially the standard topologies. Configure the neighbor with the EVPN address family (L2VPN EVPN) for the site-external overlay control plane facing the route server or remote BGW (peering to a pair of route servers is shown here). Note: The EVPN Multi-Site BGW with VRF-lite coexistence is supported starting NX-OS 7.0(3)I7(3). For details, see the For more information section at the end of this document. Beginner. The majority of those running VXLAN will likely be doing so over an IPv4 fabric, since (I believe) an IPv6 implementation of VXLAN is currently not supported by any implementation. The route-target rewrite function is performed on the EVPN Multi-Site BGW facing the site-external overlay peering. Each secure packet that is transmitted has an IPsec header in addition to the BGP EVPN VXLAN header. Note that a VTEP could be a physical switch, or a vSwitch. Similarly, if all site-internal interfaces are down, the EVPN Multi-Site virtual IP address is moved to the operational Down state, and the reasons are shown. To allow the site-internal configuration to use the automated route target and require no change to any VTEP, the rewriting of the autonomous system portion on the route target must be possible, because the export route target at the local site must match the import route target at the remote site. VXLAN EVPN Multi-Site architecture is a design for VXLAN BGP EVPNbased overlay networks. In addition, if VRF route-target imports are configured unintentionally, the selective advertisement approach helps preserve hardware table space on the BGW and even on the VTEPs beyond it. BGP EVPN VXLAN Configuration Guide, Cisco IOS XE Dublin 17.11.x BGW to shared border: Site-external eBGP overlay. Only IP addresses in VRF default that are extended with the matching tag of the route map are redistributed. Note: BGP EVPN control-plane communication between BGWs at different sites can be achieved using either a full mesh or a route server (eBGP route reflector). EVPN Multi-Site technology is based on IETF draft-sharma-multi-site-evpn. Extend VXLAN with EVPN (nv overlay evpn). To deploy network services in this cases, you can use a site-internal VTEP (that is, a services VTEP). The shared border operates like a traditional VTEP, but unlike the site-internal VTEPs discussed previously, the shared border is a site-external VTEP.

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