ACI Q in Q Dot1Q Tunnel Data Forwarding

ACI Q in Q Dot1Q Tunnel Data Forwarding


I- Overview

  • 802.1Q tunnels on edge (tunnel) ports to enable point-to-multi-point tunneling of Ethernet frames in the fabric.
  • Each tunnel carries the traffic from a single customer and is associated with a single bridge domain.
  • ACI front panel ports can be part of a Dot1q tunnel. Layer 2 switching is done based on the destination MAC (DMAC) and regular MAC learning is done in the tunnel.
  • You can include multiple edge ports and core ports (even across leaf switches) in a Dot1q tunnel.


EDGE Port:

  • Edge port can be assigned only to one dot1qtunnel.
  • EDGE Port receive Incoming customer VLAN. Add VXLAN header (associated with Tunnel BD VNID) to incoming traffic and forward to fabric.
  • Edge port Dot1q tunnels are supported on Cisco Nexus 9000 series switches with “EX” or later suffixes in the switch model name.


CORE Port:

  • You can configure multiple 802.1Q tunnels on the same core port to carry double-tagged traffic from multiple customers, each distinguished with an access encapsulation configured for each 802.1Q tunnel.
  • Core port maps outer-VLAN to VNI assigned to the Dot1q tunnel.
  • Both edge ports and core ports in Dot1q tunnel are supported on Cisco Nexus 9000 series switches with “FX” or later suffixes in the switch model name.
  • For core ports, the Ethertypes for double-tagged frames must be 0x8100 followed by 0x8100.

–> An edge port may only be part of one tunnel, but a core port can belong to multiple Dot1q tunnels.


II- Dot1Q Tunnel Configuration in ACI


III- Use Cases and Packet Flows

Dot1Q Tunnel Configuration use cases:

  • EDGE to EDGE
  • EDGE to Core
  • Core to Core









Bilel-A

Enthusiastic Network Engineer specializing in Cisco ACI, passionate about solving challenges. A lifelong learner who loves gaining and sharing knowledge. Profile: https://www.linkedin.com/in/bilel-ameur-71116b2b5
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