350-601: Implementing and Operating Cisco Data Center Core TechnologiesDemo

By Cisco · Question Mode

QuestionQ94

Network

Refer to the exhibit.

Question Image

Cisco Nexus Series Switches SW1, SW2, and SW3 are linked through Layer 2 copper interfaces. An engineer deploys IEEE 802.1w loop prevention on every VLAN to enable faster recovery from network changes or failures. The deployment must meet these requirements:

  • Interfaces connected to Layer 2 hosts must not receive STP BPDUs.
  • The deployment must detect unidirectional links caused by one-way traffic on twisted-pair links.
  • Bridge Assurance must be enabled between SW2 and SW3.
  • The Layer 2 domain must be protected against superior BPDUs received from external switches.
Drag & Drop
aggressive
network
bpdu
edge
normal
root
! SW3 configuration

interface ethernet 1/4
  spanning-tree port type 
  udld 

interface ethernet 1/5
  spanning-tree guard 

interface ethernet 1/6
  spanning-tree port type
Explanation

A switch-to-switch link must be configured as an STP network port for Bridge Assurance. UDLD aggressive detects and isolates unidirectional point-to-point link failures. Root Guard blocks a port that receives superior BPDUs, protecting the intended root bridge. A Layer 2 host-facing port is configured as an edge port, preventing BPDU transmission to the host.

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