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Advantage: Workstations behind edge ports need portfast enabled to make sure they connect to the network without typical spanning tree delays.
2.Bpduguard ensures that if somebody tries to put a L2 device on the network. it is clipped before possible interruption of spanning tree.
Disadvantage: portfast - no disadvantages I know of for access level switch edge ports.
2.If you ever need to just plug a switch into an acces switch port for whatever reason, you'll have to get to the CLI of the access switch and disable bpduguard on the subject port.
If Switch or HUB is accedently connected on Interface configured as port fast then Loop issue can occur to avoid this BPDU Guard feature can be activated.
no disadvantages I know of for access level switch edge ports.
PortFast is the solution to this problem of delays when client computers are connecting to switches. PortFast is not enabled by default. With PortFast enabled on a port, you effectively take the port and tell spanning tree not to implement STP on that port.
This solution is not a bad one if only one computer is plugged into the port — so that people will not be creating accidental loops on the network, which can be frighteningly easy to do.
Keep BPDUguard on. Enable portfast on ports to ENDPOINT CLIENTS ONLY.
If there is EVER a chance for a loop to occur, portfast can bring your network to its knees.
BUT, if used wisely, its harmless and can help clients get brought up quicker.
