2010年6月30日 · BPDUfilter on the other hand just filters BPDUs in both directions, which effectively disables STP on the port.Bpdu filter will prevent inbound and outbound bpdu but will remove portfast state on a port if a bpdu is received.Enabling BPDU filtering on an interface is the same as disabling spanning tree on it and can result in spanning-tree loops.

This post describes the operation of PortFast, BPDU guard, and BPDU filter in detail. PortFast The PortFast feature was originally developed to overcome a situation where a PC was unable to obtain a DHCP address due to the port failing to transition into the forwarding state in time.

2017年4月10日 · Un BPDU Filter mal configurado es mucho mas peligroso que un PortFast mal configurado, aun así el IOS no genera un mensaje de advertencia acerca de esto. PortFast puede crear un loop temporal de maximo 2 segundos (intervalo por defecto del Hello) hasta que el siguiente BPDU se recibe y el PortFast queda deshabilitado.

2025年1月1日 · BPDU Guard. Hay que comenzar esta sección recordando que los paquetes de BPDU son la herramienta que utiliza STP para llevar acabo diferentes tareas, como la elección del root switch, los roles y estados de los puertos y en ciertos momentos, cuando hay un cambio en la red, se envian los BPDU de tipo TCN.

BPDU Guard et BPDU Filter en mode global dépendent de PortFast opérationnel. BPDU Guard et BPDU Filter en mode interface sont inconditionnels. Un BPDU Filter mal configuré est beaucoup plus dangereux qu'un PortFast mal configuré, cependant l'IOS ne génère pas de message d'avertissement à ce sujet.

Inferior BPDU received: The switch waits for the max age timer to expire, after which proceed to transition to the forwarding state. RSTP: Superior BPDU Received: If a port receives a superior BPDU, it will become a root port, and transition immediately to a forwarding state. But before sending agreement - it does follow sync process.

2011年3月20日 · I couldn't see any Dot1Q tagging in BPDU. I have attached packet capture for your reference, please help me to understand. Native vlan: 1. Stp mode: PVST+. vlan : 1 & 200. In my test IEEE bpdu (vl 1) & PVST+ bpdu (vl 1) should be untagged and, PVST+ bpdu (vl 200 ) should be tagged. but I don't see any difference between PVST+ bpdus for vlan 1 ...

2023年2月11日 · Hey all, I'm trying to get some clarity on BPDU filter behaviour when enabled globally on a switch. My understanding was that if a BPDU was received on an interface configured with BPDU filter, it dropped out of portfast mode and behaved by normal 802.1D rules regardless of whether it was enabled per-interface or globally.

2012年7月30日 · I don't think it's entirely accurate to say that "only IST sends BPDU" within an MST region - each bridge sends MST BPDUs which can be seen as RSTP BPDUs for the IST plus Mrecords for any applicable MSTIs. Check the following document which I believe will answer your queries fully: Understanding Multiple Spanning Tree Protocol (802.1s)

Hi, I have BPDU guard on all my access ports on the network. I dont usually allow hubs to be plugged in but i need to allow a netgear hub to connect to one of my ports for a short time. I set the port to default configuration so it doesnt have BPDU guard enabled but when i …