用两个交换机帮助Dhcp服务器解决这个问题

Question

我会尽力解释我的问题。我正在尝试开关1可以为pcs提供dhcp，但我不能，在开关0我可以给dhcp服务器在个人电脑。抱歉，我的英语不好

路由器

    !
version 15.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
ip dhcp excluded-address 10.82.52.2 10.82.52.10
!
ip dhcp pool ISSINET
 network 10.82.52.0 255.255.255.0
 default-router 10.82.52.1
 dns-server 8.8.8.8
!
no ip cef
no ipv6 cef
!
!
!
!
license udi pid CISCO1941/K9 sn FTX15240O69
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0
 no ip address
 duplex auto
 speed auto
!
interface GigabitEthernet0/0.52
 encapsulation dot1Q 52
 ip address 10.82.52.1 255.255.255.0
!
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Serial0/0/0
 no ip address
 clock rate 2000000
 shutdown
!
interface Serial0/0/1
 no ip address
 clock rate 2000000
 shutdown
!
interface Serial0/1/0
 no ip address
 clock rate 2000000
 shutdown
!
interface Serial0/1/1
 no ip address
 clock rate 2000000
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router eigrp 5
 network 10.0.0.0
 no auto-summary
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end

开关0

Current configuration : 2353 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
!
!
!
spanning-tree mode pvst
!
interface FastEthernet0/1
 switchport access vlan 52
 switchport mode trunk
!
interface FastEthernet0/2
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/3
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/4
 switchport access vlan 52
 switchport mode trunk
!
interface FastEthernet0/5
 switchport access vlan 52
 switchport mode trunk
!
interface FastEthernet0/6
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/7
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/8
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/9
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/10
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/11
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/12
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/13
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/14
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/15
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/16
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/17
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/18
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/19
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/20
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/21
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/22
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/23
 switchport access vlan 52
 switchport mode access
!
interface FastEthernet0/24
 switchport access vlan 52
 switchport mode access
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan52
 ip address 10.82.52.1 255.255.255.0
!
!
!
!
line con 0
!
line vty 0 4
 login
line vty 5 15
 login
!
!
end

开关1

Current configuration : 3115 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
!
!
!
spanning-tree mode pvst
!
interface FastEthernet0/1
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/2
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/3
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/4
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/5
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/6
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/7
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/8
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/9
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/10
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/11
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/12
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/13
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/14
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/15
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/16
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/17
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/18
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/19
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/20
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/21
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/22
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/23
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface FastEthernet0/24
 switchport access vlan 52
 switchport trunk allowed vlan 52
 switchport mode trunk
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan52
 ip address 10.82.52.1 255.255.255.0
!
!
!
!
line con 0
!
line vty 0 4
 login
line vty 5 15
 login
!
!
end
enter preformatted text here


Switch#show vlan brief

 VLAN Name                             Status    Ports
 ---- -------------------------------- --------- -------------------------------
 1    default                          active    Gig0/1, Gig0/2 52   int                              active 
                                                 Fa0/2, Fa0/3, Fa0/6, Fa0/7
                                                 Fa0/8, Fa0/9, Fa0/10, Fa0/11
                                                 Fa0/12, Fa0/13, Fa0/14, Fa0/15
                                                 Fa0/16, Fa0/17, Fa0/19, Fa0/20
                                                 Fa0/21, Fa0/22, Fa0/23, Fa0/24
 1002 fddi-default                     active     1003
 token-ring-default                    active     1004
 fddinet-default                       active     1005
 trnet-default                         active     
Switch#

Answer 1

你有一些问题。首先，您没有像您在评论中所声明的那样定义VLAN。您确实使用interface Vlan52命令创建了SVI，但这并不定义交换机上的VLAN。您可以使用全局Vlan 52命令来实现这一点，如果您愿意的话，可以使用子命令来命名VLAN。

我强烈建议您使用description接口命令来标记哪个接口指向哪个网络设备。这样就很容易看到交换机之间的交换机接口，交换机到路由器的接口。对于像DHCP服务器这样的特殊主机，您也应该给它贴上标签。

另外，在开关1上，所有接口都配置为主干，而不是访问接口。大多数终端设备(个人电脑、服务器、打印机等)不要理解将主干放置在以太网帧上的VLAN标记，它们会丢弃损坏的帧。您需要使用switchport mode access接口命令配置接口。

然后，您有路由器接口，并且两个开关SVI都设置有相同的IPv4地址。路由器接口和交换机SVI就像连接在交换机上的终端设备.它们需要单独的IP地址，否则您将以重复寻址的方式结束，这将导致所有类型的问题。您需要为网络上的每个设备都提供唯一的地址。