两个网段无法通信？

因为11.3网段是二层过去的 不需要路由转发 42.254不同网段要靠路由转发 你检查路由配置把

路由配置再三查了，确定有路由， LSW2上有默认路由到LSW1，LSW1上有静态路由到42.0，LSW3上有默认路由到LSW1，LSW1 ping 42.254没问题，LSW2 ping42.254不通 ，tracert到11.1就不行了

肯定是路由问题 下去沉淀沉淀吧

路由错了

你把配置贴出来我看看

我在模拟器上测试一点问题没有，是不是真机不能这么操作，配置稍等一下

不会啊 如果没有策略限制的话 如果你模拟器是通的说明路由是没问题的 然后真机上你就看到对端网关通了就说明路由没问题 到对端终端不通可能是对端没配置网关或者开防火墙了 如果你模拟器不通就把配置贴出来我看看 真机参考我刚才说的 另外如果不是特殊环境 我建议网关放在同一台设备上

就是因为环境特殊才这么放的网关，确定没有做策略和防火墙，我也纳闷了几天，实在不知道问题在哪里，难道是真机不支持这trunk链路转发

####LSW1 vlan ba 11 17 # interface GigabitEthernet0/0/1 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 17 42 # interface GigabitEthernet0/0/2 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 17 42 # interface Vlanif11 ip address 10.12.11.1 255.255.255.0 # interface Vlanif17 ip address 10.12.17.254 255.255.255.0 # ip route-static 10.12.42.0 255.255.255.0 10.12.11.3 ###################### <LSW1>ping 10.12.42.254 PING 10.12.42.254: 56 data bytes, press CTRL_C to break Reply from 10.12.42.254: bytes=56 Sequence=1 ttl=254 time=1 ms Reply from 10.12.42.254: bytes=56 Sequence=2 ttl=254 time=1 ms Reply from 10.12.42.254: bytes=56 Sequence=3 ttl=254 time=1 ms Reply from 10.12.42.254: bytes=56 Sequence=4 ttl=254 time=1 ms Reply from 10.12.42.254: bytes=56 Sequence=5 ttl=254 time=1 ms <LSW1>ping ping -a 10.12.11.1 10.12.42.254 PING 10.12.42.254: 56 data bytes, press CTRL_C to break Reply from 10.12.42.254: bytes=56 Sequence=1 ttl=254 time=1 ms Reply from 10.12.42.254: bytes=56 Sequence=2 ttl=254 time=1 ms Reply from 10.12.42.254: bytes=56 Sequence=3 ttl=254 time=1 ms Reply from 10.12.42.254: bytes=56 Sequence=4 ttl=254 time=1 ms Reply from 10.12.42.254: bytes=56 Sequence=5 ttl=254 time=1 ms ###################### ###LSW2 vlan batch 11 17 42 # interface GigabitEthernet0/0/1 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 17 42 # interface Vlanif11 ip address 10.12.11.2 255.255.255.0 # ip route-static 0.0.0.0 0.0.0.0 10.12.11.1 # ###################### <LSW2>ping 10.12.42.254 PING 10.12.42.254: 56 data bytes, press CTRL_C to break Request time out Request time out Request time out Request time out <LSW2>tracert 10.12.42.254 traceroute to 10.12.42.254(10.12.42.254), max hops: 30 ,packet length: 40,press CTRL_C to break 1 10.12.11.1 2 ms 2 ms 2 ms 2 * * * 3 ###################### ###LSW3 # vlan batch 11 17 42 # interface GigabitEthernet0/0/1 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 17 42 # interface Vlanif11 ip address 10.12.11.3 255.255.255.0 # interface Vlanif42 ip address 10.12.42.254 255.255.255.0 # ip route-static 0.0.0.0 0.0.0.0 10.12.11.1 # ###################### <LSW3>ping -a 10.12.42.254 10.12.11.2 PING 10.11.11.23: 56 data bytes, press CTRL_C to break Request time out Request time out Request time out Request time out Request time out <LSW3>ping -a 10.12.42.254 10.12.11.1 PING 10.11.11.3: 56 data bytes, press CTRL_C to break Reply from 10.12.11.1: bytes=56 Sequence=1 ttl=253 time=1 ms Reply from 10.12.11.1: bytes=56 Sequence=2 ttl=253 time=1 ms Reply from 10.12.11.1: bytes=56 Sequence=3 ttl=253 time=1 ms Reply from 10.12.11.1: bytes=56 Sequence=4 ttl=253 time=1 ms

不好意思，帖上来格式都没有了

环境特殊，难道这种拓扑不用路由接口不行