可以在mininet中模拟总线拓扑吗？

from mininet.net import Mininet
from mininet.topo import Topo

class BusTopology(Topo):
    def build(self):
        # 添加主机节点
        host1 = self.addHost('h1')
        host2 = self.addHost('h2')
        host3 = self.addHost('h3')
        
        # 添加交换机节点
        switch = self.addSwitch('s1')
        
        # 连接节点
        self.addLink(host1, switch)
        self.addLink(host2, switch)
        self.addLink(host3, switch)

# 创建拓扑
topo = BusTopology()

# 创建网络
net = Mininet(topo)

# 启动网络
net.start()

# 测试连通性
net.pingAll()

# 停止网络
net.stop()