STPの概要および設定と確認方法 - Cisco Community
STPの概要 STPとは STP（Spanning Tree Protocol）はブリッジおよびスイッチで動作するレイヤ2のプロトコルです。 IEEEによって標準化されており、規格はIEEE 802.1Dです。 このプロトコル …
Spanning Tree Issue Root in BKN* State - Cisco Community
Jul 22, 2012 · The 3750v2 output for show spanning tree vlan 125 has it in a Desg FWD state for 1/0/40. I am no expert by any means on STP, but did not think a port would go to a BKN state if it was the …
Solved: Spanning Tree - Cisco Community
Mar 21, 2018 · Solved: Hello , I have on my switch some interconnection (L2 link point to point) with access port to different provider to receive some multicast all these ports are in vl 200 that is …
Solved: Spanning Tree Changes - Cisco Community
Mar 7, 2023 · Eth1/20 Desg FWD 4 128.148 P2p Peer (STP) Ports 16 and above are 1Gbit ports primarily just used for directly attached devices instead of switches but there are a couple of those …
Only desg port state in some Vlan no Root is this normal
Fa1 Desg FWD 19 128.3 P2p i have aleast one port on the switch in root port role in a particular Vlan except for one VLAN which has all ports in DESG role and no root port is this normal ?
Solved: STP port role - Cisco Community
Sep 10, 2020 · Solved: Dear Team , we are running pvst mode (Switch is in pvst mode) on WS-C3850-48T-E (Stack).In the show spanning-tree vlan xxx output I am seeing Backup port role (Gi2/0/22 …
Solved: Spanning Tree Loop - Cisco Community
Aug 24, 2017 · Solved: I am having a spanning tree issue between 2 switches. Each port is setup as a basic trunk, and the 2 ports are connected over a microwave link. Spanning tree is setup as MST …
VLAN STP showing BLK - Cisco Community
Feb 25, 2023 · Hi all, I have applied STP to interface 1/34/1 and attemping to use 1/33 as the default path for traffic, it is still showing BLK... any suggestions. conf interface e1/34/1 spanning-tree vlan …
Question about MST and PVST - Cisco Community
Jul 19, 2023 · Gi1/0/20 Desg FWD 20000 128.20 P2p Edge Gi1/0/22 Desg FWD 20000 128.22 P2p Edge Gi1/0/23 Desg FWD 20000 128.23 P2p Edge SW-03 VLAN0010 Spanning tree enabled …
Understanding MST Convergence - Cisco Community
Jul 16, 2025 · Gi1/1 Desg FWD 20000 128.6 P2p Gi1/2 Desg FWD 20000 128.7 P2p Gi1/3 Desg FWD 20000 128.8 P2p Po1 Desg BLK 20000 128.65 P2p Dispute Po2 Desg FWD 20000 128.66 P2p But …