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What are the disadvantages of spanning tree portfast?

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تم إضافة السؤال من قبل Sajjad Ali , Personal Assistant , Population welfare
تاريخ النشر: 2016/03/11
Muhammad Ikraam Ashraf
من قبل Muhammad Ikraam Ashraf , Junior expert Engineer , National Engineering Services,Pakistan(NESPAK).

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.

Fayyaz Ahmed
من قبل Fayyaz Ahmed , IP Core Expert , ZTE

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. 

Yousef Wshah
من قبل Yousef Wshah , Technical Team Lead - Service Provider Team , Estarta solutions

no disadvantages I know of for access level switch edge ports.

Muhammad adnan Qumar
من قبل Muhammad adnan Qumar , IT engineer , Synopsis Solutions Ltd

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.

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