Pass the Cisco CCNP Data Center 300-630 Questions and answers with CertsForce

 In a Cisco ACI Multi-Site setup, the source leaf is responsible for flooding BUM (Broadcast, Unicast, and Multicast) traffic to the specific multicast group or GIPo (Group IP Overlay). This process involves the ingress replication function on the spine nodes of the source site to replicate BUM traffic to all remote sites where the bridge domain is stretched12.

References := Cisco ACI Multi-Site Architecture White Paper, ACI Multi-Site Data Plane Communication - DCLessons

When allowing routes learned from one L3Out to be advertised out another L3Out, the Export Route Control Subnet should be enabled, and Aggregate Export should also be enabled. This configuration allows the necessary routes within the specified CIDR block to be aggregated and advertised out, facilitating efficient route advertisement without the need for an explicit list of all routes.

References: Implementing Cisco Application Centric Infrastructure Official Cert Guide

To allow only the return traffic to be redirected to the service node when the load balancer does not perform source NAT, we need to configure a Policy-Based Redirect (PBR). Here’s how it can be achieved:

Create a Contract:

Create a contract linked to the common/default filter. This contract will define the communication rules between the client endpoint and the server endpoint.

Configure L4-L7 Device:

Create an L4-L7 device with the function type set to “GoThrough.” This device will be used to redirect traffic to the service node.

Create a Policy-Based Redirect Policy:

Set up a Policy-Based Redirect (PBR) policy.

Specify the L3 Destination as the load balancer’s inside IP/MAC address.

Ensure that the L4-L7 Policy-Based Redirect Policy has the “GoThrough” function type.

Create a Service Graph Template:

Define a service graph template that references the previously created contract and L4-L7 device.

Apply the service graph template to the relevant connectors.

Connector Configuration:

On the consumer connector, reference the L4-L7 Policy-Based Redirect Policy.

On the provider connector, also reference the L4-L7 Policy-Based Redirect Policy.

By following this configuration, only the return traffic (from the server to the client) will be redirected to the service node, ensuring proper load balancing and traffic management.

References:

Implementing Cisco Application Centric Infrastructure Official Cert Guide

 To meet the requirements specified, two actions must be taken: B. Create a standard contract between EPG 51 and EPG 10 to explicitly allow communication between these two EPGs. A contract in Cisco ACI defines the communication policy between EPGs, and by creating a standard contract, specific communication can be permitted. E. Enable the Preferred Group option on EPGs 1 to 50 to allow communication within this group of EPGs. The Preferred Group feature in ACI allows all EPGs within the group to communicate with each other without the need for explicit contracts, while still enforcing contracts for communication with EPGs outside the group. References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

To prevent MAC flapping on Cisco UCS Fabric Interconnects and ACI leaf switches, MAC Pinning should be selected for the VMM vSwitch Port Channel policy. This ensures consistent uplink usage for each virtual machine’s traffic, avoiding MAC address movement across multiple uplinks.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

In a Cisco ACI Multi-Pod design, having separate Layer 3 Out (L3Out) connections for each pod is recommended when implementing active-standby firewalls in different pods. This setup allows for independent routing and failover mechanisms, ensuring that each pod can maintain external connectivity even if one firewall fails.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

To allow reachability to services outside of the Cisco ACI fabric while conserving TCAM resources, an engineer should use a contract insertion method where L30ut external EPGsact as providers and vzAny inside VRF acts as consumers. This configuration allows for communication from all EPGs within a VRF (represented by vzAny) to access external services through L30ut without having to create individual contracts for each service EPG, thus saving TCAM resources. References: Implementing Cisco Application Centric Infrastructure Official Cert Guide

 In a Cisco ACI Multi-Site setup, it’s important to configure the ISN interfaces to handle the encapsulation overhead introduced by the multi-site architecture. Option C is typically the correct choice because it includes:

A subinterface with a specific VLAN ID for traffic segregation.

An increased MTU size to accommodate the extra bytes added by encapsulation.

The correct VRF for inter-site communication.

OSPF configuration for dynamic routing between sites.

References: = Implementing Cisco Application Centric Infrastructure Official Cert Guide

 Migrating from Cisco NX-OS VXLAN to Cisco ACI fabric involves several considerations to minimize impact on workloads. Disabling bridge domain unicast routing while the default gateway remains in the VXLAN infrastructure ensures that the migration does not disrupt the existing traffic flow. This approach allows for a smoother transition by maintaining the current routing paths until the migration is complete123.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

LACP is the correct mode for the port-channel policy to ensure failover and full bandwidth utilization in both directions when integrating a Cisco ACI fabric with VMware using a VPC connected to Leaf1 and Leaf2. It allows multiple physical ports to be bundled into a single logical channel, providing redundancy and increased bandwidth. References := (Implementing Cisco Application Centric Infrastructure Official Cert Guide)