Best answer by cback85 29 January,

Drop bridge protocol data units (BPDUs) that enter any interface or a specified interface, but do not disable the interface. Configure the drop statement only on interfaces on which no spanning-tree protocol (STP, MSTP, or RSTP) is configured. Jan 27, 01/27/ Drop> Previous message repeated 10 additional times in the last second(s) icon Best answer by cback85 29 January May 06, PortFast BPDU guard prevents loops by moving a nontrunking port into an errdisable state when a BPDU is received on that port.

When you enable BPDU guard on the switch, spanning tree shuts down PortFast-configured interfaces that receive BPDUs instead of putting them into the spanning tree blocking state. MX Series routers, ACX Series routers, and EX Series switches support spanning-tree protocols that prevent loops in a network by creating a tree topology (spanning-tree) of the entire bridged network.

All spanning-tree protocols use a special type of frame called bridge protocol data units (BPDUs) to communicate with each other. Other devices in the network, such as PCs, generate their own. Drop all STP BPDU packets. set session drop-stp-packet Examples of why you might want to drop all STP BPDU packets: If there is only one switch on each side of the firewall and no other connections between the switches that can cause a loop, then STP is not required and can be disabled on the switch or blocked by the firewall.

Feb 08, When an interface configured with BPDU protection encounters an incompatible BPDU, it drops that BPDU and then, either shuts down or continues to receive packets other than spanning-tree protocol BPDUs depending on the configuration defined in the bpdu-block statement. If the interface continues to be open after dropping all incompatible BPDUs. Nov 27, I suspect that one of providers do not propagate BPDUs, spanning tree drops bpdu drop some of BPDUs.

1) with"show spanning-tree interface fastethernet 0/1 detail" I can see BPDU sent and received on interface 0/1. Are those BPDU counters refered only to configuration BPDUs?

Portfast bpdu-guard disabled for bridge.

Configuration BPDUs only flow from root toward downstream switches, is that correct?Estimated Reading Time: 5 mins. May 29, The spanning-tree bpdu-protection configuration disables the specific port or ports if the port(s) receives STP BPDUs. In the following example, switch Rack2sw1 is configured for spanning-tree protocol and switch Rack2sw2 is configured with spanning-tree protocol disabled.