300-620 · Question #192
An engineer configures a Cisco ACI Multi-Pod for disaster recovery. Which action should be taken for the new nodes to be discoverable by the existing Cisco APICs?
The correct answer is C. Enable DHCP relay on all links that are connected to Cisco ACI spines on IPN devices.. For new Cisco ACI nodes in a Multi-Pod setup to be discoverable by existing APICs, DHCP relay must be configured on the IPN devices connecting to the ACI spines. This allows DHCP requests from the new nodes to reach the APICs for IP address assignment and discovery.
Question
An engineer configures a Cisco ACI Multi-Pod for disaster recovery. Which action should be taken for the new nodes to be discoverable by the existing Cisco APICs?
Options
- AConfigure IGMPv3 on the interfaces of IPN routers that face the Cisco ACI spine.
- BEnable subinterfaces with dot1q tagging on all links between the IPN routers.
- CEnable DHCP relay on all links that are connected to Cisco ACI spines on IPN devices.
- DConfigure BGP as the underlay protocol in IPN.
How the community answered
(54 responses)- A2% (1)
- B4% (2)
- C93% (50)
- D2% (1)
Why each option
For new Cisco ACI nodes in a Multi-Pod setup to be discoverable by existing APICs, DHCP relay must be configured on the IPN devices connecting to the ACI spines. This allows DHCP requests from the new nodes to reach the APICs for IP address assignment and discovery.
IGMPv3 is related to multicast group management and is not directly involved in the initial DHCP-based node discovery process in Cisco ACI.
Subinterfaces with dot1q tagging are used for logical separation of traffic on physical links, which is not the primary mechanism for enabling DHCP-based node discovery across an IPN.
Cisco ACI fabric nodes rely on DHCP to obtain IP addresses from the APIC cluster during the discovery process. In a Multi-Pod deployment, the IPN acts as the Layer 3 fabric connecting pods, so DHCP relay must be enabled on the IPN devices to forward DHCP requests from newly connected nodes in a remote pod to the APIC cluster for discovery and IP assignment.
BGP is used as the routing protocol within the IPN to advertise reachability for the ACI pods' underlay networks, but it does not directly facilitate the initial DHCP discovery of new nodes.
Concept tested: Cisco ACI Multi-Pod node discovery DHCP relay
Source: https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/multi-pod/cisco-aci-multi-pod-deployment-guide-50x.html#Cisco_ACI_Multi_Pod_Deployment_Guide_50x_id_74390
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