CCIE R&S 400-101 V5.1 Written Exam: Implement and Troubleshoot Spanning-tree

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CCIE R&S 400-101 V5.1 Written Exam: Implement and Troubleshoot Spanning-tree

In this article, I will be discussing Cisco Implement and Troubleshoot Spanning-tree as part of Layer 2 Technologies and LAN Switching Technologies CCIE Routing and Switching (R&S) V5.1 exam blueprint topics.

LAN Switching Technologies

  • Implement and troubleshoot spanning-tree
    • PVST+/RPVST+/MST
    • Switch priority, port priority, path cost, STP timers
    • port fast, BPDUguard, BPDUfilter
    • loopguard, rootguard

Let me summarize some of the key takeaways related to Implement and Troubleshoot Spanning-tree as relevant to CCIE Routing and Switching (R&S) V5.1 written exam blueprint topics.

Implement and Troubleshoot Spanning-tree Exam Essentials

  • You can enable EtherChannel guard to detect an EtherChannel misconfiguration if your switch is running PVST+, rapid PVST+, or MSTP.
  • The Switch Priority, which is a numerical value defined by IEEE 802.1D, which is equal to 32,768 by default. If you want one particular switch to be the Root Bridge (Switch), change the priority to a lower value than 32,768.
  • With portfast enabled, STP for the port assumes that the port is not part of a loop and immediately moves to the forwarding state and does not go through the blocking, listening, discarding, or learning states.
  • By default, on Cisco switching equipment, each VLAN has its own STP instance and a root switch is elected for each VLAN; this mode is called Per VLAN Spanning Tree Plus (PVST+).

I sincerely hope that you found this article and video helpful. Please post your questions or suggestions in the comments and tell me how you are preparing for your CCIE Routing and Switching (R&S) V5.1 written and lab exams.

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