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.

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.

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.

2019年2月15日 · 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. So it's basically just to let you know that this access port is connected to a switch and it's not an end user.

2022年9月21日 · However if a portfast enabled state received a BPDU on its port it will remove portfast and transition through the STP states accordingly. BPDUGuard - Guards against BPDUs - so if it does receive a BPDU on the port set for BPDUGuard then it err-disables the port.

2012年7月30日 · Because IST is the only instance that sends/receives BPDU, D doesn't send BPDU on its port 2 because it is in blocking state. (right?) The contradictory thing is that since port 2 of D is a designated port in MSTI1, it should send BPDU (right?), but actually it does NOT, because in IST it is blocked. Have I misunderstood something ? Thanks.