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300-620 · Question #164

Refer to the exhibit. An engineer configures communication between the EPGs in different tenants. Which action should be taken to create the subnet?

The correct answer is A. Change Scope to Shared between VRFs. To enable communication between EPGs belonging to different tenants, the subnet used for communication must be explicitly configured with the 'Shared between VRFs' scope.

ACI Fabric Infrastructure

Question

Refer to the exhibit. An engineer configures communication between the EPGs in different tenants. Which action should be taken to create the subnet?

Exhibit

300-620 question #164 exhibit

Options

  • AChange Scope to Shared between VRFs.
  • BLeave Scope set to Private to VRF.
  • CAdd the L3Out for Route Profile value.
  • DChange Scope to Advertised Externally.

How the community answered

(58 responses)
  • A
    72% (42)
  • B
    3% (2)
  • C
    14% (8)
  • D
    10% (6)

Why each option

To enable communication between EPGs belonging to different tenants, the subnet used for communication must be explicitly configured with the 'Shared between VRFs' scope.

AChange Scope to Shared between VRFs.Correct

To enable communication between EPGs located in different tenants, which implies routing between different VRFs, the subnet must be configured with the 'Shared between VRFs' scope. This setting makes the subnet reachable and routable from other VRFs within the ACI fabric.

BLeave Scope set to Private to VRF.

Leaving the scope as 'Private to VRF' would restrict the subnet's visibility and routability solely to its own VRF, preventing communication with EPGs in other tenants/VRFs.

CAdd the L3Out for Route Profile value.

Adding an L3Out for a route profile is primarily for advertising routes externally or importing external routes, not for enabling internal inter-VRF communication.

DChange Scope to Advertised Externally.

Changing the scope to 'Advertised Externally' makes the subnet routable outside the ACI fabric via an L3Out, but it does not inherently enable communication with EPGs in different tenants within the fabric.

Concept tested: ACI subnet scope for inter-VRF communication

Source: https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/config-guide/cisco-aci-layer3-configuration-guide-5x/m-inter-tenant-routing.html

Topics

#inter-tenant communication#subnet scope#VRF sharing#Bridge Domain

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