On 05/23/2012 08:18 PM, Chris Gotstein wrote:
%Warning: portfast should only be enabled on ports connected to a single
host. Connecting hubs, concentrators, switches, bridges, etc… to this
interface when portfast is enabled, can cause temporary bridging loops.
My understanding of this was a router would be included as well since
it's used to connect multiple hosts.
If you don't enable portfast, you have to suffer the STP state
transitions, which lead to delays in traffic forwarding after link-up.
Portfast basically means: "This port is unlikely to be connected to
another bridge or hub, so skip the LISTENING/LEARNING transitions and
jump straight to forwarding; if it goes wrong, STP will close the loop
shortly."
It's not magic; and it should be enabled on all host ports. Routers are
hosts, at layer2.
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