2 Replies Latest reply: Sep 28, 2017 11:13 AM by Daniel RSS

    ACI Transit Routing | Post Webinar Open Discussion

    Matt Saunders - Community Manager

      Hello - Please consider this the ACI Transit Routing Post Webinar Open Discussion for today's webinar.


      I will post a notification of recording and presenters slide deck availability there once they are available. Typically this takes 3-4 business days from the day of the live event.


      Please visit the ACI Training Videos space for more info on the ACI Webinar and Training Videos series.


      Thank you very much.

        • 1. Re: ACI Transit Routing | Post Webinar Open Discussion
          Dan Verzaal

          In the demo today Daniel showed how to leak specific prefixes from L3out1 to L3out2 and vice verse. Is there a recommended way to allow all routes using or similar?  Are the check boxes all usable when using on both L3outs or is there caveats?


          thanks and nice session today.
          Dan V.

          • 2. Re: ACI Transit Routing | Post Webinar Open Discussion

            Hello. if you have and would like to leak a default route, thats a different configuration, you need a different set of checkboxes! also, if you want to leak all routes its again a different combination of checkboxes.


            here is some information from the APIC online help:


            When aggregation is not set, the subnets are matched exactly. For example, if is the subnet, then the policy will not apply to a route but it will apply only if the route is However, to avoid a tedious and error prone task of defining all the subnets one by one, aggregation can be used aggregate a set of subnets into one export, import or shared routes policy. At this time, only 0/0 subnets can be aggregated. When 0/0 is specified with aggregation, all the routes are imported, exported, or shared with (leaked to) a different VRF based on the selection option below:

            • Aggregate Export—Exports all routes of a subnet (0/0 subnets).
            • Aggregate Import—Imports all routes of a subnet (0/0 subnets).
            • Aggregate Shared Routes—When a route is learned in one VRF that needs to be leaked into another VRF, the routes can be leaked by matching the subnet exactly, or can be leaked in an aggregate way according to a subnet mask.Note: For aggregate shared routes, multiple subnet masks can be used to determine which specific route groups are leaked between VRFs (for example,, or 0/0 can be used to share all subnet routes across multiple VRFS.


            So either you decide to advertise all routes, which require the aggregate checkboxes explained above. or you advertise a default route from OSPF in l3 out1 > ACI > l3 out2