华为模拟器三层交换机VALN兼路由
 
实验需求：
 
1.创建VLAN并且能正确地划分Hybrid VLAN
 
2.Hybrid端口配置正确
 
3.Tag标签能正确标记，去除
 
4.利用三层交换机实现全网互通
 
5.设置DHCP，PC可以自动获取IP地址
 
以下是拓扑图及详细步骤：
 

 
一．创建VLAN并且划分hybrid VLAN正确
 
以下是详细步骤：
 
LSW2
 
sys
 
Enter system view, return user view with Ctrl+Z.
 
[Huawei]
 
[Huawei]vlan 10
 
[Huawei-vlan10]vlan 20
 
[Huawei-vlan20]
 
Oct 21 2013 16:07:38-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 5, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-vlan20]int e0/0/1
 
[Huawei-Ethernet0/0/1]port hybrid pvid vlan 10
 
Oct 21 2013 16:08:08-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 6, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-Ethernet0/0/1]port hybrid untagged vlan 10 20
 
[Huawei-Ethernet0/0/1]int e0/0/2
 
Oct 21 2013 16:08:28-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 7, the
 
change loop count is 0, and the maximum number of records is 4095. h
 
[Huawei-Ethernet0/0/2]port hybrid pvid vlan 20
 
[Huawei-Ethernet0/0/2]port hybrid untagged vlan 10 20
 
[Huawei-Ethernet0/0/2]
 
Oct 21 2013 16:08:48-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 9, the
 
change loop count is 0, and the maximum number of records is 4095.
 
LSW2：
 
sys
 
Enter system view, return user view with Ctrl+Z.
 
[Huawei]vlan 30
 
[Huawei-vlan30]int e
 
Oct 21 2013 16:18:58-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 4, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-vlan30]int e0/0/1
 
[Huawei-Ethernet0/0/1]port hybrid pvid vlan 30
 
[Huawei-Ethernet0/0/1]port hybrid untagged vlan 30
 
[Huawei-Ethernet0/0/1]
 
Oct 21 2013 16:19:28-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 6, the
 
change loop count is 0, and the maximum number of records is 4095.
 
二．创建Hybrid的端口
 
以下是详细步骤：
 
LSW2：
 
[Huawei]interface GigabitEthernet 0/0/1
 
[Huawei-GigabitEthernet0/0/1]
 
[Huawei-GigabitEthernet0/0/1]port hybrid tagged vlan 10 20
 
[Huawei-GigabitEthernet0/0/1]
 
Oct 21 2013 16:26:48-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 10, the
 
change loop count is 0, and the maximum number of records is 4095.
 
LSW3：
 
[Huawei]interface GigabitEthernet 0/0/1
 
[Huawei-GigabitEthernet0/0/1]port hybrid tagged vlan 30
 
[Huawei-GigabitEthernet0/0/1]
 
Oct 21 2013 16:28:48-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 7, the
 
change loop count is 0, and the maximum number of records is 4095.
 
用display vlan查看配置是否正确
 
如图所示：
 

 

 
三．在确保无误之后进行三层交换机创建VLAN，配置网关的工作
 
以下是详细步骤：
 
sys
 
Enter system view, return user view with Ctrl+Z.
 
[Huawei]vlan 10
 
Oct 21 2013 16:34:38-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 4, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-vlan10]vlan 20
 
[Huawei-vlan20]vlan 30
 
[Huawei-vlan30]
 
Oct 21 2013 16:34:48-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 6, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-vlan30]int vlan 10
 
[Huawei-Vlanif10]ip add 192.168.10.1 24
 
[Huawei-Vlanif10]int vlan 20
 
Oct 21 2013 16:35:08-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 7, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-Vlanif20]ip add 192.168.20.1 24
 
Oct 21 2013 16:35:28-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 8, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-vlan30]int vlan 30
 
[Huawei-Vlanif30]ip add 192.168.30.1 24
 
[Huawei-Vlanif30]
 
Oct 21 2013 16:35:48-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 9, the
 
change loop count is 0, and the maximum number of records is 4095.
 
四．进入VLAN创建DHCP，在此之前先开启DHCP功能
 
以下是详细步骤：
 
[Huawei]dhcp enable
 
Info: The operation may take a few seconds. Please wait for a moment.done.
 
[Huawei]interface vlan 10
 
[Huawei-Vlanif10]
 
Oct 21 2013 16:42:29-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 10, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-Vlanif10]dhcp select interface
 
[Huawei-Vlanif10]
 
Oct 21 2013 16:42:49-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 11, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-Vlanif10]int vlan 20
 
[Huawei-Vlanif20]dhcp select interface
 
[Huawei-Vlanif20]int vlan 30
 
Oct 21 2013 16:43:09-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 12, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-Vlanif30]dhcp select interface
 
[Huawei-Vlanif30]
 
Oct 21 2013 16:43:19-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 13, the
 
还要将三层交换机下的两个二层接口改为Hybrid端口，并标记TAG标签
 
[Huawei]interface GigabitEthernet 0/0/1
 
[Huawei-GigabitEthernet0/0/1]port hybrid tagged vlan 10 20
 
[Huawei-GigabitEthernet0/0/1]
 
Oct 21 2013 16:46:46-08:00 Huawei %%01IFNET/4/IF_STATE(l)[0]:Interface Vlanif10 h
 
as turned into UP state.
 
Oct 21 2013 16:46:46-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[1]:The line protocol
 
IP on the interface Vlanif10 has entered the UP state.
 
Oct 21 2013 16:46:46-08:00 Huawei %%01IFNET/4/IF_STATE(l)[2]:Interface Vlanif20 h
 
as turned into UP state.
 
Oct 21 2013 16:46:46-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[3]:The line protocol
 
IP on the interface Vlanif20 has entered the UP state.
 
Oct 21 2013 16:46:49-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 14, the
 
change loop count is 0, and the maximum number of records is 4095.nt
 
[Huawei-GigabitEthernet0/0/1]int g0/0/2
 
[Huawei-GigabitEthernet0/0/2]port hybrid tagged vlan 30
 
[Huawei-GigabitEthernet0/0/2]
 
Oct 21 2013 16:47:14-08:00 Huawei %%01IFNET/4/IF_STATE(l)[4]:Interface Vlanif30 h
 
as turned into UP state.
 
Oct 21 2013 16:47:14-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[5]:The line protocol
 
IP on the interface Vlanif30 has entered the UP state.
 
Oct 21 2013 16:47:19-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 15, the
 
change loop count is 0, and the maximum number of records is 4095.
 
验证一下如果PC能自动获得IP地址且三台PC能够互通则前期工作完成
 
如图所示：
 

 

 

 
Ping 192.168.20.254: 32 data bytes, Press Ctrl_C to break
 
From 192.168.20.254: bytes=32 seq=1 ttl=127 time=94 ms
 
From 192.168.20.254: bytes=32 seq=2 ttl=127 time=47 ms
 
From 192.168.20.254: bytes=32 seq=3 ttl=127 time=78 ms
 
From 192.168.20.254: bytes=32 seq=4 ttl=127 time=62 ms
 
From 192.168.20.254: bytes=32 seq=5 ttl=127 time=63 ms
 
--- 192.168.20.254 ping statistics ---
 
5 packet(s) transmitted
 
5 packet(s) received
 
0.00% packet loss
 
round-trip min/avg/max = 47/68/94 ms
 
PC>ping 192.168.30.254
 
Ping 192.168.30.254: 32 data bytes, Press Ctrl_C to break
 
From 192.168.30.254: bytes=32 seq=1 ttl=127 time=78 ms
 
From 192.168.30.254: bytes=32 seq=2 ttl=127 time=47 ms
 
From 192.168.30.254: bytes=32 seq=3 ttl=127 time=78 ms
 
From 192.168.30.254: bytes=32 seq=4 ttl=127 time=78 ms
 
From 192.168.30.254: bytes=32 seq=5 ttl=127 time=94 ms
 
--- 192.168.30.254 ping statistics ---
 
5 packet(s) transmitted
 
5 packet(s) received
 
0.00% packet loss
 
round-trip min/avg/max = 47/75/94 ms
 
五，在三层交换机上创建一个新的VLAN，用于访问路由器的端口
 
详细步骤如下：
 
[Huawei]
 
[Huawei]vlan 6
 
[Huawei-vlan6]
 
Oct 21 2013 16:58:39-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 16, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-vlan6]int vlan 6
 
[Huawei-Vlanif6]ip add 1.1.1.1 24
 
[Huawei-Vlanif6]
 
Oct 21 2013 17:01:19-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 17, the
 
change loop count is 0, and the maximum number of records is 4095.
 
[Huawei-Vlanif6]int g0/0/3
 
[Huawei-GigabitEthernet0/0/3]port hybrid untagged vlan ａｌｌ(这里要将TAG标签脱去，不然，路由器接收到的报文将无法识别)
 
[Huawei-GigabitEthernet0/0/3]
 
Oct 21 2013 17:02:58-08:00 Huawei %%01IFNET/4/IF_STATE(l)[6]:Interface Vlanif6 ha
 
s turned into UP state.
 
Oct 21 2013 17:02:58-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[7]:The line protocol
 
IP on the interface Vlanif6 has entered the UP state.
 
Oct 21 2013 17:02:59-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.
 
25.191.3.1 configurations have been changed. The current change number is 18, the
 
change loop count is 0, and the maximum number of records is 4095.
 
六．在AR１路由器中将内网端口配置网关及子网掩码
 
详细步骤如下：
 
sys
 
Enter system view, return user view with Ctrl+Z.
 
[Huawei]
 
[Huawei]interface GigabitEthernet 0/0/0
 
[Huawei-GigabitEthernet0/0/0]ip add 1.1.1.2 24
 
O
 
[Huawei-cGigat 21 2013 14:23:20-05:13 HuaweibitEthernet0/ %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered the UP state.
 
[Huawei-GigabitEthernet0/0/0]0/0]
 
接下来陆续将后面两台路由器的接口配置完毕，并实现三台路由器互通
 
以下是详细步骤：
 
AR１：
 
[Huawei]interface GigabitEthernet 0/0/1
 
[Huawei-GigabitEthernet0/0/1]ip add 202.106.1.1 24
 
Oct 21 2013 14:29:35-05:
 
[Huawei-GigabitEther13 Huawei %%01neIFNET/4/t0/0/1LINK_STATE(]l)[0]:The line protocol IP on the interface GigabitEthernet0/0/1 has entered the UP state.
 
[Huawei-GigabitEthernet0/0/1]
 
AR２：
 
sys
 
Enter system view, return user view with Ctrl+Z.
 
[Huawei]interface GigabitEthernet 0/0/0
 
[Huawei-GigabitEthernet0/0/0]ip add 202.106.1.2 24
 
Oct 21 2013 1
 
[Huawei-Gi4:31:30-05:13 Huawei %%01IFNgabitEthernet0/0/0]ET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered the UP state.
 
[Huawei-GigabitEthernet0/0/0]int g0/0/1
 
[Huawei-GigabitEthernet0/0/1]ip add 202.106.2.1 24
 
Oct 21 2013
 
[Huawei-Gigabi 1tEtherne4:31:51-05:13 Huawei %%01IFNt0/0/1]ET/4/LINK_STATE(l)[1]:The line protocol IP on the interface GigabitEthernet0/0/1 has entered the UP state.
 
[Huawei-GigabitEthernet0/0/1]
 
AR３：
 
sys
 
Enter system view, return user view with Ctrl+Z.
 
[Huawei]interface GigabitEthernet 0/0/0
 
[Huawei-GigabitEthernet0/0/0]ip add 202.106.2.2 24
 
Oct 21 2013 14:34:47-05:13 Huawei %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered t
 
[Huawei-Gigahe UP state. b
 
[Huawei-GigabitEthernet0/0/0]itEthernet0/0/0]
 
以上是配置IP地址，接下来是做静态路由
 
AR１
 
[Huawei]ip route-static 202.106.2.0 24 202.106.1.2
 
AR３
 
[Huawei]ip route-static 202.106.1.0 24 202.106.2.1
 
来验证一下三台路由器是否互通了
 
如图所示：
 

 

 
七．在三层交换机上做默认路由并在AR１上做到达内网的静态路由
 
以下是详细步骤：
 
LSW：
 
[Huawei]ip route-static 0.0.0.0 0.0.0.0 1.1.1.2
 
AR１：
 
[Huawei]ip route-static 192.168.10.0 24 1.1.1.1
 
[Huawei]ip route-static 192.168.20.0 24 1.1.1.1
 
[Huawei]ip route-static 192.168.30.0 24 1.1.1.1
 
做到这一步要来个小检查，查看自己的PC能否Ｐｉｎｇ通三层交换机中所创建的VLAN的网关和AR１内网口的网关
 
如图所示：
 

 

 
八．最后一步，在AR１上做PAT即可实现全网互通
 
以下是详细步骤：
 
sys
 
Enter system view, return user view with Ctrl+Z.
 
[Huawei]
 
[Huawei]acl 2000
 
[Huawei-acl-basic-2000]rule 5 permit source any
 
[Huawei-acl-basic-2000]qu
 
[Huawei]interface GigabitEthernet 0/0/1
 
[Huawei-GigabitEthernet0/0/1]nat outbound 2000
 
[Huawei-GigabitEthernet0/0/1]
 
最后验证：
 
如图：
 

 

 
就此完成！

VLAN与三层交换机
 
1、打开ensp，建立如下拓扑图
 
 框选所有设备，点击启动
 
 2、配置VLAN
 进入LSW2，改名为SW1，创建VLAN 10 20
 
 划分接口vlan
 
 这边就可以简写了
 
 这里，把g0/0/1口也要配置trunk，因为三层交换机是二层交换机加路由器
 
 退出接口，用dis vlan 看一下，三个接口都配置完成
 
 再进入LSW3：
 创建vlan10和vlan20
 
 划分vlan
 
 
 3、配置Trunk
 进入LSW2，配置g0/0/1口的trunk
 
 在SW2上的g0/0/2口也要配置trunk
 
 进入LSW3，配置g0/0/1口的trunk （这里就简写了）
 
 4、配置三层交换机
 进人LSW1:
 先配置VLAN
 
 进入g0/0/1口，配置trunk
 
 配置三层交换机：
 
 5、配置PC的IP 地址、子网掩码、网关
 这里，网关是一定要配置的，因为跨网段通信，数据是要通过网关的
 
 
 
 
 6、下面来用主机ping一下同一网段和不同网段的主机，再通过抓包看一下数据的传输
 先Ping一下相同广播域内的主机：
 
 在trunk口处进行抓包，此时ping同一vlan是不用经过三层交换机的
 
 请求和回复都是成对的：
 
 下面，我们再来ping一下不同vlan的主机之间是否能够进行通信：
 在三层交换机接口处进行抓包实验：
 
 
 可以看到request和reply都是成对的
 
 至此，VLAN划分与三层交换机实验完活！

华为eNsp模拟器做实验二数据链路层实验
 
一、vlan的配置
 
 
连在交换机上的主机，需要处在同一网段才能ping通，与默认网关地址无关，例如连接在交换机上的192.168.2.2/24和192.168.3.2/24无法ping通,而192.168.2.2/24和192.168.2.3/24
 不管设置什么网关都能ping通
 
 
上，主机网关为192.168.3.1
 下，主机网关为192.168.2.1
 
且上面的拓扑图任意两个主机之间都能ping通，下面是配置交换机的vlan
 
 
指定各接口为access口，华为默认为trunk/hybrid接口
 配置完后的vlan2
 
 
配置完后的vlan3
 
 
到此已经将以太口1、2、3划分到Vlan2中，将21、22划分到了vlan3中
 
主机1能ping通2和3，不能ping通4和5
 
 
同一个vlan里可以通信，不同vlan里不能通信，至此vlan配置阶段结束
 
二、trunk设置与vlan间的通信
 
这种接线首先124互通，35互通，如果所有主机的网段相同则所有主机可互通（未设置网关也互通）
 
 
 
先把s1的 pc1 pc2 划分到vlan 2
 
 
pc3划分到vlan3
 
 
配置主机2的vlan
 pc4划分到vlan2
 
 
pc5划分到vlan3
 
 
再配置交换机s1与s2之间的接口为trunk接口，并配置trunk端口允许通过的vlan标识
 
 
 
测试各个主机的连通性
 pc1 ping pc2
 
 
pc1 ping pc3
 
 
pc1 ping pc4
 
 
pc1 ping pc5
 
 
综上，主机中1和2和4之间可以ping通，3和5之间可以ping通（配置vlan以后）
 分析1、5之间不能互通的原因：
 主机发出数据包之前，将会查看数据包中的目的地址，如果目的ip与本机ip地址在同一网段上，主机会直接发出一个ARP请求对方主机的MAC地址，收到目的主机的ARP回复后，再发送数据包。
 而主机1访问主机5的192.168.1.15这个IP地址时，发现和自己的IP 192.168.2.11不在同一个网段上，即目标跨网段，那么主机1就会发送ARP分组来请求网关设备的MAC地址，但是这里没有配置三层交换机的ip，即没有网关设备，因此没有设备应答ARP请求，使导致丢包，因此主机1与主机5之间无法正常通信。
 
二层交换机的vlan之间无法互通，三层交换机需要配置vlan接口的ip地址后才能实现vlan接口间的互相访问
 
配置vlan的虚接口ip地址
 
 
pc1和pc4均可ping通pc5了，实现了vlan之间的通信，不同网段之间也可以互通
 
看看网关配置对vlan间通信的影响
 
主机1未配置默认网关时或者配置网关与所处的vlan2的虚接口ip地址不同时
 
 
主机1配置正确网关后
 
 
总结一下这个实验
 如果主机的网关与所处vlan的虚接口ip地址不一致时不能实现不同vlan之间的通信，二层交换机之间不能实现不同vlan之间的通信，只有三层交换机才可以使得不同的vlan间进行通信。
 原理：
 配置三层交换机的vlan虚接口的ip地址后，三层交换机相当于路由器，其虚接口的ip相当于网关地址。
 PC1发现和PC5处在不同的网段中，
 PC1将ARP分组发送给自己的默认网关192.168.2.1即三层交换机vlan2虚接口的IP地址，交换机将其转发到自己的另一个接口vlan3 的虚接口ip地址192.168.1.1，
 在这里再进行广播，主机5发现数据包的目标地址是自己，
 所以响应ARP请求，
 然后PC1和PC5就可以进行通信了
 
VLAN怎么标识的
 
 三种vlan接口
 
 
 

 
SW1：
 
vlan batch 2 3 #同时新建两个VLAN：VLAN2和VLAN3
 
int g0/0/1
 
port link-type access #将GigabitEthernet0/0/1端口设置为access类型
 
vlan 2
 
port g0/0/1 #将GigabitEthernet0/0/1端口加入VLAN2
 
q
 
int g0/0/2
 
port link-typr access #将GigabitEthernet0/0/2端口设置为access类型
 
vlan 3
 
port g0/0/2 #将GigabitEthernet0/0/2端口加入VLAN3
 
q
 
int g0/0/3
 
port link-type trunk #将GigabitEthernet0/0/3端口设置为trunk类型
 
port trunk allow-pass vlan all #GigabitEthernet0/0/3端口允许所有VLAN通过
 
q #GigabitEthernet0/0/3端口属于默认VLAN：VLAN1
 
int vlanif 1
 
ip add 192.168.3.1 24 #设置VLAN1的虚端口IP和掩码
 
int vlanif 2
 
ip add 192.168.1.1 24 #设置VLAN2的虚端口IP和掩码
 
int vlanif 3
 
ip add 192.168.2.1 24 #设置VLAN3的虚端口IP和掩码
 
q
 
ip route-static 0.0.0.0 0 192.168.3.2 #加一条默认路由，下一跳是路由器R1的Ethernet0/0/0端口