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300-170 · Question #150

You are implementing an ACI network with switches that are running the Multiple Spanning Tree Ptotocol. Which two actions are required fort his configuration? ( Choose Two )

The correct answer is D. Map MST instances to VLANs E. Create MST bridge domain for the native VLAN to carry the BBDU. To integrate Multiple Spanning Tree Protocol (MSTP) within an ACI network, it is required to map MST instances to specific VLANs and create an MST bridge domain for the native VLAN to carry BPDUs.

Network Services

Question

You are implementing an ACI network with switches that are running the Multiple Spanning Tree Ptotocol. Which two actions are required fort his configuration? ( Choose Two )

Options

  • ACreate MST EPG fort he native VLAN to carry the BPDU
  • BMap MST instances to interface profiles
  • CCreate MST Private network for the native VLAN to carry the BPDU
  • DMap MST instances to VLANs
  • ECreate MST bridge domain for the native VLAN to carry the BBDU

How the community answered

(46 responses)
  • A
    7% (3)
  • B
    4% (2)
  • C
    15% (7)
  • D
    74% (34)

Why each option

To integrate Multiple Spanning Tree Protocol (MSTP) within an ACI network, it is required to map MST instances to specific VLANs and create an MST bridge domain for the native VLAN to carry BPDUs.

ACreate MST EPG fort he native VLAN to carry the BPDU

EPGs (Endpoint Groups) are used for policy enforcement on endpoints and are not the correct ACI construct for defining how BPDUs are carried or how MST instances are handled.

BMap MST instances to interface profiles

MST instances are mapped to VLANs, which define the Layer 2 forwarding contexts, rather than being mapped directly to interface profiles, which are physical port configurations.

CCreate MST Private network for the native VLAN to carry the BPDU

A 'Private network' is not the appropriate ACI object for handling the native VLAN to carry BPDUs for MSTP integration; a dedicated bridge domain serves this purpose.

DMap MST instances to VLANsCorrect

When integrating an ACI fabric with external networks running MSTP, it is essential to map the MST instances within ACI to the corresponding VLANs that are being carried. This mapping ensures that ACI correctly interprets and interacts with the external MSTP topology.

ECreate MST bridge domain for the native VLAN to carry the BBDUCorrect

For proper handling of MSTP Bridge Protocol Data Units (BPDUs) originating from external MSTP domains, a dedicated MST bridge domain must be explicitly created in ACI for the native VLAN. This bridge domain ensures that BPDUs are transparently forwarded or processed by the ACI fabric.

Concept tested: ACI MSTP integration

Source: https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/l2-configuration/cisco-aci-layer2-configuration-guide-501/m_l2_external_stp.html

Topics

#ACI network#MSTP#VLAN mapping#bridge domain

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