Hosts can not reach each other in this topology

[Dong Mo]

Hi Dear Group,

I just set up a topology like this 

set ns [new Simulator] source tb_compat.tcl tb-set-delay-capacity 1 set bridge0 [$ns bridge] set bridge1 [$ns bridge] set bridge2 [$ns bridge] tb-set-hardware $bridge0 d710 tb-set-hardware $bridge1 d710 tb-set-hardware $bridge2 d710 set host0 [$ns node] tb-set-hardware $host0 d710 set host1 [$ns node] tb-set-hardware $host1 d710 set host2 [$ns node] tb-set-hardware $host2 d710 set lan0 [$ns make-lan "$bridge0 $bridge2 $host0" 1G 0ms] set lan1 [$ns make-lan "$bridge0 $bridge1 $host1" 1G 0ms] set lan2 [$ns make-lan "$bridge2 $host2 $bridge1" 1G 0ms] $ns rtproto Static $ns run

However, the hosts in this network cannot ping through each other. It seems the bridge nodes are not functioning properly.

Is there any possible way to make an equivalent topo and all the hosts can reach each other?

Thank you so much for help!

Best

-Mo Dong