Presenting VXLAN EVPN Multi-Site
VXLAN EVPN Multi-Site is an open arrangement that broadens the ability of VXLAN EVPN to give progressive multi-site network and permits extending of Layer 2 and 3 benefits past a solitary overlay space. The change over Multi-Pod/Multi-Fabric plans is critical in that now VXLAN EVPN is as yet utilized for conveying movement between locales however strategies can be connected at the fringe gadgets that likewise fill in as the 'entryway' to alternate destinations. These outskirt gadgets called Border Gateways (BGW) and end, veil, and interconnect different overlay areas, textures or destinations. The picked approach in VXLAN EVPN Multi-Site protects the system control limit for activity implementation and disappointment regulation with the straightforwardness of a coordinated Layer 2 and 3 expansion.
In EVPN Multi-Site, we characterize every texture ('site') as its own particular BGP Autonomous System.
The two important steps that allow EVPN Multi-Site to achieve its overall behavior are:
- How a BGP EVPN advertisement appears remotely: When a BGP EVPN Route-Type 2 (MAC/IP) or Route-Type 5 (IP Prefix) is advertised from a remote site (remote AS), the BGW will take this information and advertise it with its own IP address as the next-hop into its local site (local AS).
- How a leaf performs the data-plane operations when exiting the local traffic: As a result of BGP EVPN advertisements into its local site (local AS), all site local leafs will see the BGW as the only next-hop to reach the remote site prefixes (both MAC and IP). Whenever there is a need to reach these destinations, the VXLAN encapsulation from a leaf will be performed towards the BGW of the local site.
Summary
Innovations such as the Cisco CloudScale ASICs available through the Nexus 9000-EX and -FX series provide many advanced capabilities for VXLAN overlays that are not available as widely in other switching platforms, like VXLAN EVPN Multi-Site. Cisco is developing comprehensive deployment guides that will go in-depth on all of the topics we have introduced in this two-part blog series. Stay tuned.
Resources
Since the release of NX-OS 7.0(3)I7(1) for Nexus 9000 platform, various resources have been posted around EVPN Multi-Site.