两个三层交换机，要实现跨vlan通讯，有什么要求？要怎么配置？关键要配置什么？
\u5982\u4f55\u5b9e\u73b0\u4e0d\u540cvlan\u95f4\u7684\u901a\u4fe1\uff0c\u4e09\u5c42\u4ea4\u6362\u673a\u5982\u4f55\u914d\u7f6e\uff1f\uff1f\u4e09\u5c42\u4ea4\u6362\u673a\u5b9e\u73b0\u4e0d\u540cvlan\u7684\u901a\u4fe1
\u914d\u7f6e \u5168\u8fc7\u7a0b\u5728\uff1a
SA\uff1a1.vlan10
2.(\u9009\u548cP1\u76f8\u8fde\u7684\u7684\u7aef\u53e3\u5982f0/1 )int f0/1
3.sw ac vlan 10
4 \uff08\u9009\u548c\u6838\u5fc3\u4ea4\u6362\u673a\u76f8\u8fde\u7684\u7aef\u53e3\u5982f0/24\uff09 int f0/24
5.sw ac vlan 10 (\u6216sw mo trunk)
SB\uff1a1.vlan 20
2.(\u9009\u548cP2\u76f8\u8fde\u7684\u7684\u7aef\u53e3\u5982f0/1 )int f0/1
3.sw ac vlan 20
4 \uff08\u9009\u548c\u6838\u5fc3\u4ea4\u6362\u673a\u76f8\u8fde\u7684\u7aef\u53e3\u5982f0/24\uff09 int f0/24
5.sw ac vlan 20 (\u6216sw mo trunk)
SC\uff1a1.vlan 30
2.(\u9009\u548cP3\u76f8\u8fde\u7684\u7684\u7aef\u53e3\u5982f0/1 )int f0/1
3.sw ac vlan 30
4 \uff08\u9009\u548c\u6838\u5fc3\u4ea4\u6362\u673a\u76f8\u8fde\u7684\u7aef\u53e3\u5982f0/24\uff09 int f0/24
5.sw ac vlan 30 (\u6216sw mode trunk)
\u6838\u5fc3\u4ea4\u6362\uff1a
1.vlan 10
2.vlan 20
3.vlan 30
4.int vlan 10 \uff08\u914d\u7f6evlan\u865a\u62df\u63a5\u53e3\uff09
5 ip add 192.168.10.1 255.255.255.0 \uff08\u914d\u7f6eip\u5730\u5740\uff09
6.int vlan 20
7.ip add 192.168.20.1 255.255.255.0
8.int vlan 30
9.ip ad 192.168.30.1 255.255.255.0
10.\uff08\u8fdb\u5165\u548cSA\u76f8\u8fde\u7684\u7aef\u53e3\uff09int f0/1
11.sw ac vlan 10 (\u6216sw mode trunk)
12.\uff08\u8fdb\u5165\u548cSB\u76f8\u8fde\u7684\u7aef\u53e3\uff09int f0/2
13.sw ac vlan 20 \uff08\u6216sw mode trunk\uff09
14. \uff08\u8fdb\u5165\u548cSC\u76f8\u8fde\u7684\u7aef\u53e3\uff09int f0/3
15. sw ac vlan 30 \uff08\u6216sw mode trunk\uff09
\u7ed3\u675f
\u8fd8\u6709\u95ee\u9898\u53ef\u4ee5\u518d\u95ee
参考配置：
vlan10
inter vlan 10
ip add 192.168.1.1 24
vlan 20
inter vlan 20
ip add 192.168.2.1 24
三层交换机的每一个接口连接一个独立的VLAN
开启每个接口的路由功能，并配置IP
采用SVI方式（switch virtual interface）
Switch(config)#interface vlan 10
Switch(config-if)#ip address 192.168.1.1 255.255.255.0
Switch(config-if)#no shutdown
要配置vtp，只需要在一个交换机上配置就行了。其它都一样的，ok!
还有不懂请问。
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