兩個網段無法通信？

因為11.3網段是二層過去的 不需要路由轉發 42.254不同網段要靠路由轉發 你檢查路由配置把

路由配置再三查了，確定有路由， LSW2上有默認路由到LSW1，LSW1上有靜態路由到42.0，LSW3上有默認路由到LSW1，LSW1 ping 42.254沒問題，LSW2 ping42.254不通 ，tracert到11.1就不行了

肯定是路由問題 下去沉澱沉澱吧

路由錯了

你把配置貼出來我看看

我在模擬器上測試一點問題沒有，是不是真機不能這麼操作，配置稍等一下

不會啊 如果沒有策略限製的話 如果你模擬器是通的說明路由是沒問題的 然後真機上你就看到對端網關通了就說明路由沒問題 到對端終端不通可能是對端沒配置網關或者開防火牆了 如果你模擬器不通就把配置貼出來我看看 真機參考我剛才說的 另外如果不是特殊環境 我建議網關放在同一台設備上

就是因為環境特殊才這麼放的網關，確定沒有做策略和防火牆，我也納悶了幾天，實在不知道問題在哪裏，難道是真機不支持這trunk鏈路轉發

####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，帖上來格式都沒有了

環境特殊，難道這種拓撲不用路由接口不行