4506 ws-4448G-T<--->glc-t 3560,
1. on 4506, show cdp nei ï¼can find 3560,
but 3560 can't find 4506.
2. no bpdu exchange, both 3560 and 4506 are root bridge.
3.IP can be transfered without any problem.
I try 1000G crossover UTP instead of straight-through UTP, but same problem...