i have configured VLT between Sw1 and SW2. I also configured a vlp port channel between the logical node SW1-SW2 and the IOSvL2.

When i do a continous ping from PC1 to PC3 and i shut port G0/1 on IOSvL2 ths vlt undertands that the link G0/1-e1/1/1(sw2) is down but the ping goes on.

If i bring G0/1 up thus restoring the link and i then shut the G0/0 down, the ping gets timed-out (sometimes a ping gets through). When i check the SPT i see that Po1 at SW2 is ALD and BLW in state.

cisco runs rstp and SW1 and SW2 also rstp

Any ideas? Could it be a bug of GNS3?

both dell switches are S4128F-ON (10.5.5.0P1.48)

Thanks