Spanning tree, PVST lab - GNS3
as usual, i'm using cisco 3740 with additional slot NM-16ESW. for the 1st stage, we only use one link for every connection between every switch (i'll refer the router as the switch for the rest of the tutorial) configure on D1, port fast 1/1 and 1/7 no shutdown switchport trunk encap dot1q switchport mode trunk on D2, no span tree yet on D2 because all port still down D2(config)#do sh span br No spanning tree instances exist. configure the same we did on D2 for port 1/1 and 1/3 immediately after port change to trunk mode, you'll notice that it is in the listenin(LIS) mode this is when they running the algorithm to find a loop later the status will change to (learn)LRN then (forwarding)FWD D2(config-if)#do sh sp br ... Name Port ID Prio Cost Sts Cost Bridge ID Port ID ----------...