24 port PoE SF350

[MIKEMPS]

We have 3 220 26 port Cisco poE switches in one building with one older Trendnet 24 port switch in one rack, connecting to another building into a common switch. We replaced two older Trendnet 24 port switches in an upper floor rack connecting to the same common switch. When we added two SF350 PoE switches, the three 220 switches dropped. When we unplugged the two 350s, the 220s came up. Then we tried one Trendnet switch and one 350 and the network was up. Is it possible that one 350 is having issues? If we add it to the nwetwork, it drops the 220s.

[Reza Sharifi]

Not sure what type of switches the 220s are, but if this happens with multiple switches and you have multiple vendors in the mix, check to make sure the STP protocols you are using is compatible between vendors.

HTH

[MIKEMPS]

Thanks... I will check that out

[MIKEMPS]

Two Trendnet switches and three 220 Cisco and one 350 switches work now. Why would another 350 Cisco switch introduced drop the three 220 switches?

[agmad4665]

Much appreciated... I will look at that please reply me website