An engineer must connect Cisco ACI fabric using Layer 2 with external third-party switches. The third-party switches are configured using 802.1s protocol. Which two constructs are required to…

Question

Options

• Aspanning tree policy for mapping MST Instances to VLANs
• BMCP policy with PDU per VLAN enabled
• CMCP instance policy with administrative slate disabled
• Ddedicated EPG for native VLAN
• Estatic binding of native VLAN in all existing EPGs

• A
  83% (34)
• B
  5% (2)
• C
  10% (4)
• E
  2% (1)

Explanation

MST (IEEE 802.1s), BPDU frames do not carry a VLAN tag, and the BPDUs are sent over the native VLAN. Typically, the native VLAN is not used to carry data traffic, and the native VLAN may not be configured for data traffic on the Cisco ACI fabric. As a result, to help ensure that MST BPDUs are flooded to the desired ports, the user must create an EPG (an MST EPG) for VLAN 1 as native VLAN to carry the BPDUs. This EPG connects to the external switches that run In addition, the administrator must configure the mapping of MST instances to VLANs to define which MAC address table must be flushed when a Topology Change Notification (TCN) occurs. When a TCN event occurs on the external Layer 2 network, this TCN reaches the leafs to which it connects via the MST EPG, and flushes the local endpoint information associated with these VLANs on these leafs; as result, these entries are removed from the spine-proxy mapping infrastructure/white-paper-c11-737909.html

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