Cisco Updated 300-620 Exam Questions and Answers by aaminah

To implement the Inter-Site Network (ISN) for a Cisco ACI Multi-Site deployment, the following configuration steps are essential:

Configure OSPF on all ISN routers: OSPF (Open Shortest Path First) is a routing protocol that is used to ensure that all routers in the ISN have the necessary routing information to forward packets between sites.

Configure BIDIR-PIM on all ISN routers: BIDIR-PIM (Bidirectional Protocol Independent Multicast) is used for efficient multicast traffic forwarding across the ISN. This is particularly important for Cisco ACI Multi-Site deployments as it supports the replication of broadcast, unknown unicast, and multicast (BUM) traffic across sites.

References :=

Cisco ACI Multi-Site Configuration Guide

Cisco ACI Multi-Site Architecture White Paper

o protect the ACI fabric from spanning-tree loops, the feature that must be enabled on the ACI leaf ports is BPDU Guard 

When configuring an L3Out in Cisco ACI and encountering a QoS-related error, creating a custom QoS policy is often necessary to clear the fault. This involves defining a QoS policy that meets the specific requirements of the L3Out configuration and applying it to the relevant interfaces or globally within the fabric. The custom QoS policy should be designed to prioritize traffic appropriately and ensure that the necessary QoS settings are in place for the L3Out connections1.

References :=

Cisco ACI L3Out Configuration Examples1

The two actions that extend a Layer 2 domain beyond the ACI fabric are extending the bridge domain out of the ACI fabric (Option D) and extending the EPG out of the ACI fabric (Option E)34. Extending the bridge domain involves creating a Layer 2 outside connection, while extending the EPG involves statically assigning a port with a VLAN ID to an EPG34.