Which feature should be disabled on a bridge domain when a default gateway for endpoints is on an external device instead of a Cisco ACI bridge domain SVI?
Unicast Routing under the bridge domain
This feature enables IP unicast routing on the bridge domain. If this feature is not enabled, the subnets configured under the bridge domain are not pushed down to leaf switches, and routing will not occur. In addition, a bridge domain with Unicast Routing disabled will not learn any IP address as an endpoint. Thus, that bridge domain will be used only for Layer 2 communications, and endpoints in that bridge domain should have their default gateways outside Cisco ACI.
Unicast Routing enabled without subnet is not a recommended approach. If Unicast Routing is enabled without any bridge domain subnets configured, IP information in the bridge domain can still be learned through ARP in the data plane, but no routing will occur because there will be no SVI to perform routing on the bridge domain.
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739989.html
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Mr_Certifiable
9 months, 3 weeks ago