Configuring an L3OUT in Cisco ACI

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About ucsguru

Principal Consultant and Data Center Subject Matter Expert. I do not work or speak for Cisco or any other vendor.
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3 Responses to Configuring an L3OUT in Cisco ACI

  1. sandev chopra says:

    Hi, great byte size video. I did not understand why you had to create the subnet: 0.0.0.0/0 inside the aci? Shouldn’t that be learned over ospf from the router?

    • ucsguru says:

      Great question Sandev, the subnet defined within the External EPG is to define the destination IP addresses required for the contract (ACL) between your external and internal EPGs. You can define multiple External EPGs to an L3out each with different defined subsets, allowing for granularity of control to different external networks.
      Regards
      Colin

  2. Mousa says:

    Hi Colin …. I need to have the same subnet shared between VRFs, advertised externally & limit IP learning to that subnet
    In this case, I will need to configure the subnet under the Bridge domain to limit IP learning to that subnet & to associate that subnet to the L3Out …. In addition, I will need to configure the same subnet under the EPG to have proper route leaking (as that EPG is used a contract provider) … I am a little bit confused about this configuration

    Is it going to work to have the same SVI interface created under the EPG & the bridge domain?

    Should I flag the subnet as shared between VRFs & advertise externally from both places (Under the EPG & the Bridge Doamin)?

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