Notes

Cisco CCNP/ BCMSN Examination Tutorial: Configuring PortFast And BPDU Guard
In chành xe phú quốc , you learnt further about PortFast and the issue it can consequence in if configured on the incorrect port! Suited just for swap ports joined straight to a solitary host, PortFast permits a port performing STP to go straight from obstructing to forwarding technique.

A Cisco router will give you a warning when you configure PortFast:

SW1( config) #int quickly /5

SW1( config-if) #spanning- tree portfast

% Warning: portfast must just be allowed on ports linked to asingle host. Connecting hubs, concentrators, switches, bridges, and so on. to this user interface when portfast is enabled, can bring about temporarybridging loops. Use with Warning

% Portfast has been configured on FastEthernet0/5 even so will just

When the interface is in a non-trunking method, have impression.

SW1( config-if) #.

Not only will the improve notify you about the suitable use of PortFast, but you require to location the port into obtain manner forward of PortFast will get outcome.

There is a possibility - just a probability - that any individual is heading to regulate to hook up a modify to a port jogging Portfast. The subsequent problem is that there could be a new root bridge most well-liked - and it could be a swap that is just not definitely even in your neighborhood!

BPDU Guard guards in direction of this devastating likelihood. If any BPDU comes in on a port which is functioning BPDU Guard, the port will be closed down and set into mistake handicapped problem, shown on the swap as err-disabled. A port positioned in err-disabled place out should be resumed by hand.

BPDU Guard is off on all ports by default, and is designed it doable for as analyzed to in this report:.

SW1( config) #int quick /5.

SW1( config-if) #spanning- tree bpduguard allow for.

It truly is a terrific strategy to make it possible for BPDU Guard on any port you happen to be operating PortFast on. There is certainly no demand in overhead, and it does reduce the risk of a alter sending out BPDUs into a port configured with PortFast - not to challenge out the risk of a swap not beneath your regulate having a root switch to your group!

% Warning: portfast demands to only be enabled on ports linked to asingle host. Connecting hubs, concentrators, switches, bridges, and so on. There is an alternative - just an possibility - that one more particular person is most likely to regulate to hyperlink a change to a port jogging Portfast. If any BPDU will arrive in on a port which is running BPDU Guard, the port will be shut down and set into oversight disabled issue, verified to on the alter as err-disabled. A port positioned in err-disabled state want to be reopened manually.
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