martes, septiembre 27, 2022
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Why Transition to BGP EVPN VXLAN in Enterprise Campus

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Community Virtualization Convergence in Enterprise Campus

Campus networks are the spine of enterprises offering connectivity to vital companies and purposes. All through time many of those networks have been deployed with a wide range of overlay applied sciences together with applied sciences to perform the specified final result. Whereas these conventional overlay applied sciences achieved 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 resolution 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 higher 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 kinds of Layer 2 overlay community extensions as merchandise and applied sciences developed. Traditional 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 resolution:

  • 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, nonetheless, it continued to be difficult. The BGP EVPN VXLAN replaces STP with an L2 overlay enabling new potentialities to IT together with controlling flood-domain measurement, suppressing redundant ARP/ND community site visitors, and seamless mobility whereas retaining the unique IPv4/v6 tackle plan when transitioning from Distribution swap or centralized firewall gateway working over STP community.
  • 802.1ad – The IEEE 802.3ad (QinQ) is a standard multi-tenant Layer 2 community resolution. 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 permits the chance to rework 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 resolution 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} developed in the direction of high-speed Metro-Ethernet networking throughout MAN/WAN. The Enterprise networks rapidly evolve adopting Ethernet over MPLS (EoMPLS) or Digital Personal LAN Service (VPLS) resolution 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 might add complexity as community progress 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 improve, IT operational challenges and control-plane overhead to handle Multi-VRF additionally improve. The BGP EVPN leverages IP VRF to dynamically construct a segmented routed community atmosphere 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 resolution. 
  • GRE – A really perfect resolution for constructing overlay networks throughout IP networks with out implementing hop-by-hop within the underlay community. The GRE-based overlay resolution helps restricted point-to-point or point-to-multipoint topologies.  Following related 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 assist best-in-class resiliency for mission-critical networks.  
  • MPLS VPN – The MP-BGP capabilities have been extensively adopted in massive 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 resolution. The MPLS VPN enabled Enterprise networks can prolong current 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 drastically 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 neater job, particularly when mission-critical downtime is virtually inconceivable. The Cisco Catalyst 9000 mixed with 30+ years of software program innovation with the {industry}’s most subtle 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 current 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 top-to-end community and wealthy characteristic integration could be enabled unbiased of how underlying community infrastructure is constructed as illustrated above. 

















 Layer 3 EntryCisco StackWise DigitalESI Layer 2 Multihome
Leaf LayerEntryDistributionDistribution
Backbone LayerCore or different  
Border LayerKnowledge Middle ACI, WAN, DMZ or extra  
Overlay Community Kind HelpLayer 3 Routed, Distributed AnyCast Gateway (Symmetric IRB), Centralized Gateway (Uneven IRB)
Layer 2 Cross-Join
  
Overlay Unicast HelpIPv4 and IPv6 Unicast  
Overlay Multicast HelpIPv4 and IPv6 – Tenant Routed Multicast  
Wi-fi Community IntegrationNative Mode – Central Switching
FlexConnect Mode – Central and Distributed Native Switching
  
Knowledge Middle IntegrationBGP EVPN VXLAN – Widespread EN/DC Cloth
Cisco ACI – Nexus 9000 Border Layer 3 Handoff
  
Multi-site EVPN AreaCampus Catalyst 9000 switches extending material with Nexus 9000 Multi-site Border Gateway integration  
Exterior Area HandoffL2: Untag, 802.1Q, 802.1ad, EoMPLS, VPLS
L3: Multi-VRF, MPLS VPN, SD-WAN, GRE
  
Knowledge Airplane load sharingL3: ECMPL2: Per movement Port-Channel Hash
L3: ECMP
Multicast:S, G + Subsequent Hop
L2: Per Port-VLAN Load Balancing
L3: EMCP
Multicast: S, G + Subsequent Hop
System ResiliencyCisco 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 ResiliencyBFD (Single/Multi-Hop)
Swish Restart
Swish Insertion
L2: EtherChannel, UDLD, and so on.
BFD (Single/Multi-Hop)
Swish Restart
Swish Insertion
L2: UDLD, and so on.
BFD (Single/Multi-Hop)
Swish Restart
Swish Insertion


Scalable Structure Issues

IT organizations adopting the BGP EVPN VXLAN resolution should think about the right way to scale multi-dimensionally when constructing large-scale materials. This calls for call-to-action to design the precise structure based mostly on confirmed ideas within the networking world. No matter bodily or digital networking, it shall be designed with an acceptable stage of hierarchy to assist the best-in-class scalable resolution 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 think about constructing a structured Multi-Web site overlay networking resolution permitting Enterprise campus to develop by dividing material domains in several boundaries and utilizing material border gateways to interconnect all collectively.

Keep tuned we’ll share extra ideas on how Cisco Catalyst 9000 and Nexus 9000 can convey next-generation BGP EVPN VXLAN with Multi-site options. And as all the time, 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 companion with you and allow the imaginative and prescient. 

 

Be taught extra concerning the Cisco Catalyst 9000 Swap Household

Further 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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