Eigrp running on all three routers, i try to ping from r3 to r1 loop address after the ping starts and i did manually shut down the r1 ehternet connection the pings start losing packets and it take more then 10 seconds to reach ping from r2 to r1 loop. is there anyway to avoid this problem.
some of my friends said that the switch running STP on each port and requiring 30 seconds to proceed through Listening and Learning states until a port transitions to the Forwarding state. if i confiure the switch to rstp and make the three ethernet port to spanning-three port fast and acces port can avoid this problem ?
If you enabled the EIGRP process, and the router from which you enabled the EIGRP process, connects to it's neighbors via a switch, it's completely possible that, if you're using 802.1D it will take 30 seconds by default, for the port to come up, if portfast is not configured. Since by default, the EIGRP default hello timer is 5 seconds and hold time is 15 seconds for this type of network. So it's completely possible that STP could cause this issue.
If you feel that spanning-tree timers causing problem you can use spanning-tree portfast command on all port connected to routers and i dont thing there would be any loop problem occur as you have only one switch in network as well all routers port are L3.
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