08-24-2013 05:59 AM - edited 03-07-2019 03:06 PM
Our client has many remote sites in different location and each site is with a WAN router and a 3750 X switch. Switch is working as a layer 3 switch and the uplink connected to WAN router is a layer 3 interface. They have configuered " Spanning tree portfast" on the uplink going to WAN router. Is that required to configure "spanning tree portfast" over that uplink to WAN router?
08-24-2013 06:10 AM
Spanning tree Portfast should be enabled on ports connecting to hosts (PCs, laptops, printers, etc...) your uplink port is routed port, so there is no STP involved.
HTH
08-24-2013 06:10 AM
Hi,
there's no possibility for the occurrence of a bridging-loop between the router and the switch, so it's safe to configure portfast.
Without portfast, after re-initialization the link, no traffic would be forwarded for 30 seconds (2x forward delay), so from a convergence perspective this is a meaningful optimization.
in case of a routed port, STP portfast makes no sense (I've overlooked that, sorry).
Hope that helps
Rolf
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide