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300-620 · Question #104

All workloads in VLAN 1001 have been migrated into EPG-1001. The requirement is to move the gateway address for VLAN 1001 from the core outside the Cisco ACI fabric into the Cisco ACI fabric. The…

The correct answer is B. Enable Hardware Proxy. To migrate a VLAN's gateway into the ACI fabric for routing between EPGs while minimizing flooded traffic, specific Bridge Domain configurations are necessary.

ACI Packet Forwarding

Question

All workloads in VLAN 1001 have been migrated into EPG-1001. The requirement is to move the gateway address for VLAN 1001 from the core outside the Cisco ACI fabric into the Cisco ACI fabric. The endpoints in EPG-1001 must route traffic to endpoints in other EPGs and minimize flooded traffic in the fabric. Which configuration set is needed on the bridge domain to meet these requirements?

Options

  • ADisable ARP Flood
  • BEnable Hardware Proxy
  • CDisable Local IP Learning Limit
  • DEnable Flood

How the community answered

(16 responses)
  • A
    6% (1)
  • B
    81% (13)
  • D
    13% (2)

Why each option

To migrate a VLAN's gateway into the ACI fabric for routing between EPGs while minimizing flooded traffic, specific Bridge Domain configurations are necessary.

ADisable ARP Flood

Disabling ARP Flood is a related measure for reducing broadcasts, but Hardware Proxy is a more comprehensive solution that specifically addresses both inter-EPG routing and optimized ARP handling to minimize flooding for a moved gateway.

BEnable Hardware ProxyCorrect

Enabling Hardware Proxy on the Bridge Domain allows the ACI fabric to handle ARP requests efficiently by learning endpoint MAC and IP addresses, proxying ARPs, and facilitating inter-EPG routing, which minimizes flooded ARP traffic and supports moving the gateway function into ACI.

CDisable Local IP Learning Limit

Disabling Local IP Learning Limit affects the number of IP addresses an endpoint can learn, but it does not directly address the requirements for moving a gateway into ACI or minimizing flooded traffic.

DEnable Flood

Enabling Flood would increase flooded traffic in the fabric, directly contradicting the requirement to minimize flooded traffic.

Concept tested: Cisco ACI Bridge Domain Hardware Proxy / Optimized ARP

Source: https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/l2-configuration/cisco-aci-layer2-configuration-guide-5x/m_configuring-bridge-domains.html#Cisco_Concept.dita_a0945934-2e62-43ce-9a88-25f0e1f7ac9c

Topics

#Bridge Domain#Hardware Proxy#L2 gateway#ARP flood

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