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lindawa
Cisco Employee
Cisco Employee

Is it supported or NOT supported? It's a frequently asked question. 

Before APIC, release 2.3(1f), transit routing was not supported within a single L3Out profile. In APIC, release 2.3(1f) and later, you can configure transit routing with a single L3Out profile, with the following limitations:

  • If the VRF is unenforced, an external subnet (l3extSubnet) of 0.0.0.0/0 can be used to allow traffic between the routers sharing the same L3EPG.
  • If the VRF is enforced, an external default subnet (0.0.0.0/0) cannot be used to match both source and destination prefixes for traffic within the same L3EPG. To match all traffic within the same L3EPG, the following prefixes are supported:
    • IPv4
      • 0.0.0.0/1—with External Subnets for the External EPG
      • 128.0.0.0/1—with External Subnets for the External EPG
      • 0.0.0.0/0—with Import Route Control Subnet, Aggregate Import
    • IPv6
      • 0::0/1—with External Subnets for the External EPG
      • 8000::0/1—with External Subnets for the External EPG
      • :0:0/0—with Import Route Control Subnet, Aggregate Import
  • Alternatively, a single default subnet (0.0.0.0/0) can be used when combined with a VzAny contract. For example:
    • Use a VzAny providing contract and an L3EPG consuming contract (matching 0.0.0.0/0), or a VzAny consuming contract and L3EPG providing contract (matching 0.0.0.0/0).
    • And use the subnet 0.0.0.0/0—with Import/Export Route Control Subnet, Aggregate Import, and Aggregate Export.


The external documentation was also updated yesterday by the doc team

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/kb/b_KB_Transit_Routing.html#concept_CBBCBA5750D84E4BB49CD727FDCF547A

Comments
Rick1776
Level 5
Level 5

Thanks for sharing. 

 

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