同一个交换机的两个VLAN,PING不通是怎么回事 。

femerry

一个C类的网段，分成三个VLAN，
A网络设备：10.21.118.253/255.255.255.224
B生产网段：10.21.118.126/255.255.255.128
C办公网段：10.21.118.190/255.255.255.192
与交换机相连的路由器连在设备网段，以太口的地址是10.21.118.254

同一个网段的机器可以相互PING通，但出网段就不行了，A网的机器PING-B网的机器都不通。
但在交换机上，可PING出路由器，

下面是配置文件，大家看看是什么原因啦。

Building configuration...

Current configuration : 2838 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname SW3550
!
!
no aaa new-model
ip subnet-zero
ip routing
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
!
!
vlan internal allocation policy ascending
!
!
interface FastEthernet0/1
switchport access vlan 100
switchport mode access
!
interface FastEthernet0/2
switchport access vlan 100
switchport mode access
!
interface FastEthernet0/3
switchport access vlan 20
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/4
switchport access vlan 20
switchport mode access
!
interface FastEthernet0/5
switchport access vlan 20
switchport mode access
!
interface FastEthernet0/6
switchport access vlan 20
switchport mode access
!
interface FastEthernet0/7
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/8
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/9
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/10
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/11
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/12
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/13
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/14
switchport access vlan 10
switchport mode ac
!
interface FastEthernet0/15
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/16
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/17
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/18
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/19
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/20
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/21
switchport acce
switchport mode access
!
interface FastEthernet0/22
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/23
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/24
switchport access vlan 10
switchport mode access
!
interface GigabitEthernet0/1
switchport mode dynamic desirable
!
interface GigabitEthernet0/2
switchport mode dynamic desirable
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
ip address 10.21.118.126 255.255.255.128
no ip proxy-arp
!
interface Vlan20
ip address 10.21.118.190 255.255.255.192
no ip proxy-arp
!
interface Vlan100
ip address 10.21.118.253 255.255.255.224
no ip proxy-arp
!
router eigrp 1
network 10.0.0.0
no auto-summary
!
ip classless
ip http server
!
!
!
!
!
control-plane
!
!
line con 0
line vty 0 4
login
line vty 5 15
login
!
!
end

xliu

要作TRUNK，单臂路由。