[DC] Datacenter Interconnects (DCI, OTV)

Distributed Data center Goals

  • Ensure business continuity
  • Distributed applications
  • Seamless workload mobility
  • Maximize compute resources

Challenges in traditional Layer 2 VPN:

  • Flooding Behavior
    • Unknown unicast for mac propagation
    • Unicast Flooding reaches all sites
  • Pseudo-wire Maintenance
    • Full mesh of Pseudo-wire is complex
    • Head-End replication is a common problem
  • Multi-Homing
    • Requires additional protocols and extends STP
    • Malfunctions impact multipe sites

https://www.quisted.net/index.php/2018/02/15/data-center-design-vii-datacenter-interconnects/

DCI vs Network Interconnectivity

Network Interconnectivity

  • Using traditional LAN technologies to connect multiple datacenters
  • Typically use Layer3
    • Some applications require L2 Extensions
      • Clustering
      • Workload mobility
      • Replication

Datecenter Interconnect

  • Loop-free LAN extention stretching across the datacenter WAN.
  • Issuess to be concerned with:
    • Limited by physical standards for media
    • STP convergence
    • Broadcast storms
    • Failure isolation (sites should be independent)
    • Number of sites
    • Scalability (Max numbers of VLANs and MAC addresses)
    • Confidentiality ( Encryption )
    • Operational complexity

OTVĀ  ( Overlay Transport Virtualization )

  • Ethernet LAN Extension over any Network
    • Works over darkfiber, MPLS, or IP Network
    • Multi-datacenter scalability
  • Simplified Configuration and Operation
    • Seamless overlay – no network redesign
    • Single touch site configuration
  • High Resilency
    • Failure domain isolation
    • Seamless Multi-homing
  • Maximizes available bandwith
    • Automated Multipathing
    • Optimal multicast replication

 

  • Unknown Unicast Supression
    • No flooding storm over DCI
  • Spanning tree Seperation
    • Reduce failure domains
  • Controlling ARP
    • ARP cache
  • Multihoming
    • Per-VLAN loadbalancing
  • Path optimization
    • FHRP Localization

NVGRE

 

Tags:,

Add a Comment

Your email address will not be published. Required fields are marked *


CAPTCHA Image
Reload Image