Why Transition to BGP EVPN VXLAN in Enterprise Campus


Community Virtualization Convergence in Enterprise Campus

Campus networks are the spine of enterprises offering connectivity to crucial companies and purposes. All through time many of those networks have been deployed with quite a lot of overlay applied sciences together with applied sciences to perform the specified final result. Whereas these conventional overlay applied sciences completed the technical and enterprise necessities, lots of them lacked manageability and scalability introducing complexity into the community. The industry-standard BGP EVPN VXLAN is a converged overlay answer offering unified control-plane-based layer-2 extension and layer-3 segmentation over IP underlay. The aim-built expertise for Enterprise campus and datacenter addresses the well-known traditional networking protocols challenges whereas offering L2/L3 community companies with larger flexibility, mobility, and scalability.

BGP EVPN VXLAN converges Layer 2 and Layer 3
Fig #1: BGP EVPN VXLAN converges Layer 2 and Layer 3

Legacy Layer 2 Overlay Networks Departure

Enterprise campus networks have traditionally been deployed with a number of forms of Layer 2 overlay community extensions as merchandise and applied sciences advanced. Basic data-plane based mostly Layer 2 prolonged networks constructed upon a flood-n-learn foundation could be considerably simplified, scaled, and optimized when migrating away to next-generation BGP EVPN VXLAN answer:

  • STP – Enterprise campus networks have operated spanning-tree protocol (STP) since its inception. A number of enhancements and alternate options have been developed to simplify and optimize STP complexity, nevertheless, it continued to be difficult. The BGP EVPN VXLAN replaces STP with an L2 overlay enabling new prospects to IT together with controlling flood-domain dimension, suppressing redundant ARP/ND community visitors, and seamless mobility whereas retaining the unique IPv4/v6 tackle plan when transitioning from Distribution change or centralized firewall gateway working over STP community.
  • 802.1ad – The IEEE 802.3ad (QinQ) is a typical multi-tenant Layer 2 community answer. The twin-stack IEEE 802.1Q header tunnels particular person tenant VLANs over restricted and managed core VLANs to help in lowering the bridging area and overlapping tenant VLAN IDs throughout the core community. BGP EVPN VXLAN allows the chance to remodel the Layer 2 spine community with a simplified IP transport using VXLAN and proceed to bridge single or dual-stack IEEE 802.1Q VLAN throughout the material. 
  • L2TPv3 – Layer 2 Protocol Tunnel model 3 (L2TPv3) offers easy point-to-point L2 overlay extension answer over an IP core between statically paired distant community units. Such flood-n-learn based mostly Layer 2 overlay networks could be migrated to BGP EVPN VXLAN offering far superior and versatile Layer 2 extension options throughout an IP core community. 
  • VPWS/VPLS – The requirements ratified a number of Layer 2 community extensions because the {industry} advanced in the direction of high-speed Metro-Ethernet networking throughout MAN/WAN. The Enterprise networks rapidly evolve adopting Ethernet over MPLS (EoMPLS) or Digital Non-public LAN Service (VPLS) answer working over IP/MPLS based mostly spine. The Enterprise community could be simplified, optimized, and resilient with BGP EVPN VXLAN supporting versatile Layer 2 overlay topologies with control-plane based mostly Layer 2 extensions that help in bettering end-to-end community efficiency and consumer expertise. 

Conventional Layer 3 Overlays Convergence

Like Layer 2 prolonged networks, segmented Layer 3 networks could be deployed with numerous overlay applied sciences. The parallel working protocol set with every supporting both routing or bridging could add complexity as community development and calls for broaden linearly. As BGP EVPN VXLAN converges routing and bridging capabilities it assists in lowering control-plane and operational duties leading to simplicity, scale, and resiliency.

  • Multi-VRF – A easy hop-by-hop Layer 3 digital community segmenting Layer 3 bodily interface into logical IEEE 802.Q VLAN for every digital community small to mid-size community environments. As segmentation necessities enhance, IT operational challenges and control-plane overhead to handle Multi-VRF additionally enhance. The BGP EVPN leverages IP VRF to dynamically construct a segmented routed community surroundings and with VXLAN the data-plane segmentation is managed on the community edge enabling simplified underlay IP core and scalable Layer 3 overlay routed community answer. 
  • GRE – A super answer for constructing overlay networks throughout IP networks with out implementing hop-by-hop within the underlay community. The GRE-based overlay answer helps restricted point-to-point or point-to-multipoint topologies.  Following comparable ideas, the BGP EVPN VXLAN can simplify the community with a single management airplane, dynamically construct VXLAN tunnels, and helps versatile overlay routing topologies. The ECMP based mostly underlay and overlay networks help best-in-class resiliency for mission-critical networks.  
  • MPLS VPN – The MP-BGP capabilities have been broadly adopted in giant Enterprises addressing community segmentation throughout self-managed IP/MPLS managed networks. The well-proven and scalable MPLS VPN in Enterprise overcomes a number of various applied sciences challenges utilizing shim-layer label switching answer. The MPLS VPN enabled Enterprise networks can lengthen present MP-BGP designs and transition VPNv4/VPNv6 to new L2VPN EVPN address-family supporting seamless migration. The sting-to-edge VXLAN data-plane can converge MPLS VPNs, mVPN, and VPLS overlay right into a single unified management airplane and allow enhanced built-in routing and bridging operate. It additional assists in enormously simplifying IP core community with out MPLS LDP protocol dependencies throughout the paths. 

Cisco Catalyst 9000 – Seamless and Versatile BGP EVPN VXLAN Transition

Transitioning from traditional merchandise and applied sciences has by no means been a better job, particularly when mission-critical downtime is virtually unimaginable. The Cisco Catalyst 9000 mixed with 30+ years of software program innovation with the {industry}’s most refined community working system Cisco IOS-XE® offers nice ranges of flexibility to seamlessly adapt BGP EVPN VXLAN for Enterprise prospects as a part of an present operation or planning to start a brand new networking journey whereas sustaining full-backward compatibility with traditional merchandise and overlays networks supporting continuous enterprise communications. 

BGP EVPN VXLAN design alternatives
Fig #2: BGP EVPN VXLAN design alternate options

The tip-to-end community and wealthy function integration could be enabled unbiased of how underlying community infrastructure is constructed as illustrated above. 

  Layer 3 Entry Cisco StackWise Digital ESI Layer 2 Multihome
Leaf Layer Entry Distribution Distribution
Backbone Layer Core or different    
Border Layer Information Middle ACI, WAN, DMZ or extra    
Overlay Community Kind Assist Layer 3 Routed, Distributed AnyCast Gateway (Symmetric IRB), Centralized Gateway (Uneven IRB)
Layer 2 Cross-Join
Overlay Unicast Assist IPv4 and IPv6 Unicast    
Overlay Multicast Assist IPv4 and IPv6 – Tenant Routed Multicast    
Wi-fi Community Integration Native Mode – Central Switching
FlexConnect Mode – Central and Distributed Native Switching
Information Middle Integration BGP EVPN VXLAN – Frequent EN/DC Material
Cisco ACI – Nexus 9000 Border Layer 3 Handoff
Multi-site EVPN Area Campus Catalyst 9000 switches extending cloth with Nexus 9000 Multi-site Border Gateway integration    
Exterior Area Handoff L2: Untag, 802.1Q, 802.1ad, EoMPLS, VPLS
Information Aircraft load sharing L3: ECMP L2: Per move Port-Channel Hash
Multicast:S, G + Subsequent Hop
L2: Per Port-VLAN Load Balancing
Multicast: S, G + Subsequent Hop
System Resiliency Cisco StackWise-1T
Cisco StackWise-480
Cisco StackPower
Quick Reload
Stateful Switchover (SSO)
Ext. Quick Software program Improve
In-Service Software program Improve (ISSU)
Cisco StackWise Digital
Stateful Switchover (SSO)
In-Service Software program Improve (ISSU)
Stateful Switchover (SSO)
In-Service Software program Improve (ISSU)
Community Resiliency BFD (Single/Multi-Hop)
Sleek Restart
Sleek Insertion
L2: EtherChannel, UDLD, and so on.
BFD (Single/Multi-Hop)
Sleek Restart
Sleek Insertion
L2: UDLD, and so on.
BFD (Single/Multi-Hop)
Sleek Restart
Sleek Insertion

Scalable Structure Issues

IT organizations adopting the BGP EVPN VXLAN answer should take into account methods to scale multi-dimensionally when constructing large-scale materials. This calls for call-to-action to design the proper structure based mostly on confirmed ideas within the networking world. No matter bodily or digital networking, it shall be designed with an applicable stage of hierarchy to help the best-in-class scalable answer supporting a big enterprise community. The smaller fault domains and condensed community topologies in core-layer allow resilient networks are well-known advantages of hierarchical networking.

Because the variety of EVPN leaf nodes will increase overlay prefixes and the blast radius within the community grows. The community architects shall take into account constructing a structured Multi-Website overlay networking answer permitting Enterprise campus to develop by dividing cloth domains in numerous boundaries and utilizing cloth border gateways to interconnect all collectively.

Keep tuned we’ll share extra ideas on how Cisco Catalyst 9000 and Nexus 9000 can deliver next-generation BGP EVPN VXLAN with Multi-site options. And as at all times, if you’re already on the journey to design and construct a scalable end-to-end BGP EVPN VXLAN campus community, then merely attain out to your Cisco gross sales group to associate with you and allow the imaginative and prescient. 


Be taught extra concerning the Cisco Catalyst 9000 Swap Household

Extra Assets:

Cisco IOS XE BGP EVPN VXLAN Software program Information

Automate BGP EVPN VXLAN utilizing Ansible Playbook

Selecting the Finest Overlay Routing Structure for EVPN








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