1. What is the EtherType of a BPDU frame sent by a switch which runs Spanning Tree Protocol

  2. Bridge Assurance with vPC on port type network

  3. High availability LAN segment with Cisco ISR4451X and 2 x Netgear GS724 - Port-channel vs. BDI vs. BVI?

  4. Can't get DHCP to work in Spanning Tree

  5. spanning tree at layer 3

  6. Regarding vPC Dual Active or Split Brain scenario

  7. Is STP used to prevent all traffic looping or just broadcast and multicast?

  8. STP / Why one end is in BLK state?

  9. How to extensively test an ethernet switch
  10. Will STP lose data whilst switching from a failed link?

  11. Juniper trunking with two links (not using LAG)

  12. Setting up a new Meraki MS220-48FP Switch to replace a pre-existing DellForce10 Switch

  13. Behavior about 802.1D with ISL

  14. Will STP portfast prevent a loop?
  15. Which switch MAC addresses are used for the Bridge ID in STP?

  16. UDLD on Nexus 5548 and Nexus 2232

  17. Building Spanning-tree link
  18. How did I break (half of) my network?

  19. Consequences of changing spanning-tree timers on core switches on live network

  20. How far is VLAN broadcast propagated?

  21. Multiple spanning tree terminology (CST/IST/CIST) and exact behavior

  22. root port election in STP

  23. Trying to configure STP on a small network and have a few questions

  24. What could cause network to duplicate packets? STP during convergence?

  25. Netgear SPF and trunking between three switches
  26. Should we trunk between L2 AS switches? Or send everything to the L3 DS?
  27. Cabling two access ports on the same switch from different VLANs

  28. MSTP - different VLAN mapping in different regions

  29. Doesn't a router stop broadcast?

  30. Adding new switch to Spanning Tree network
  31. Rapid Spanning Tree Protocol - RSTP Bridge Id isn't RSTP-Priority + Ethernet-MAC

  32. Why forward delay in spanning tree
  33. Spanning tree - port roles and status during root bridge election

  34. Spanning tree root bridge process validation
  35. When and where to use Spanning-Tree (Portfast)
  36. Does a switch generate TCN BPDU when it elects a new root bridge?

  37. RSTP: Using switches in pairs to two switches?

  38. Possible to do a port-channel and STP with three 10Gbps fibre interfaces?
  39. BPDU exchange between RSTP switches
  40. PVST, PVST+ and RPVST

  41. Are TCN BPDUs dropped on their way to the root if "message age" gets higher then "max age"?

  42. What happens when a BPDU message age reaches "max age"

  43. STP not preventing switching loop
  44. Feeling lost troubleshooting Trunk and STP configurations on Packet Tracer

  45. Why is blocked edge port still forwarding in RSTP on Juniper EX Switch?

  46. How is the root bridge determined in spanning tree from BPDU perspective?

  47. Do IEEE 802.1_ protocols use BFS or DFS to find spanning trees?
  48. How is the root bridge elected in STP?
  49. Cisco IOS Switch: Why is "no spaning-tree vlan XXX" automatically inserted on vlan creation?

  50. Finding the optimum root bridge for a spanning tree
  51. H3C MST BPDU exchange failing

  52. STP port flapping
  53. How does Fabric Connect protocol work?

  54. Should I disable STP on my access ports?

  55. Two physical links, different VLANs, no PO. Will PVST shut one link down?

  56. Why in STP is the switch that is the "center" of the network is called the "Root Bridge," not "Root Switch"?

  57. BPDUGuard and BPDUFilter on Spanning Tree Edge Port

  58. STP interface command shutdown STP globally
  59. Cisco VLAN configurations with WAP - Poor performance

  60. STP and LAG Problems
  61. CIST starved for a bpdu Rx on port 17, temporary fix

  62. What is the difference between message age and maximum age in STP

  63. How to prevent loop while trunking Fortigate and Cisco L2 Switches

  64. L2 network design questions
  65. Blocking all VLANs between Juniper switches

  66. Why is there a large difference between BPDUs sent and received counters for RSTP root port?

  67. Cisco CLI STP VLAN removal

  68. Understanding how spanning-tree protocol (STP) works, along with CDP and DTP
  69. How do modern switches forward ethernet frames logically?
  70. Does SPB really replace STP?
  71. Manager states we cannot put retail switches on network due to fear of non-STP config and network storm problems. Is this true?
  72. STP topology changed after:

  73. spanning tree, how can I change the path?

  74. Cisco STP issue with BIG IP F5 trunk
  75. RSTP Troubleshooting

  76. How can I prevent VLAN bridging on a Cisco switch

  77. LACP trunk between BNT layer2/3 switch and Cisco 2960s stack on a bladeCenter H


  79. When exactly the Proposal and Agreement flags are used in RSTP

  80. VSS back to back like vPC back to back

  81. Spanning Tree cost calculation

  82. Bridge is always root for a vlan

  83. Even after the spanning tree is determined why Root Bridge periodically send configuration message.

  84. Building too large for ethernet runs

  85. Path cost between a different bandwidth interface in STP
  86. MST region and CST virtual bridge priority
  87. Two root bridges for same vlan
  88. Possibilities to switch between primary and backup radios between locations
  89. Root path cost?

  90. STP Protocol issue
  91. STP - Port path cost won't update
  92. How fast can STP, RSTP, and MSTP find a new route?

  93. Understanding virtual port channel peer switch command

  94. Edge port continuously switching between Port-offline and blocked by STP

  95. Block L2 Loops without STP?
  96. Regarding Bridge Assurance feature
  97. can a switch participate in STP without MAC?

  98. Does the System ID Extension ever affect root bridge election?

  99. Cisco Layer2 ACL and STP

  100. RSTP and PVST mix in switch fabric