思科: trunk: 接口的配置同时存在access vlan 与trunk，哪个先生效，答案：trunk生效

思科: trunk: 接口的配置同时存在access vlan 与trunk，哪个先生效，答案：trunk生效

现象：

interface GigabitEthernet0/1
 switchport access vlan 12
 switchport trunk encapsulation dot1q
 switchport mode trunk

结论：起用的为是tunk。

（1）拓扑图

（2）基本配置

sw1:
vlan 11
vlan 12
interface GigabitEthernet0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
 
 interface Vlan11
 ip address 192.168.11.1 255.255.255.0
!
interface Vlan12
 ip address 192.168.12.1 255.255.255.0
 
 
sw2:
vlan 11
vlan 12
interface GigabitEthernet0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
 
 interface Vlan11
 ip address 192.168.11.2 255.255.255.0
!
interface Vlan12
 ip address 192.168.12.2 255.255.255.0

测试：

sw1#ping 192.168.11.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.11.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 11/23/41 ms
sw1#ping 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 11/21/41 ms
sw1#

sw2#ping 192.168.11.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.11.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 10/21/38 ms
sw2#
sw2#ping 192.168.12.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 10/32/64 ms
sw2#

（3）在trunk接口上添加命令switchport access vlan 12，起作用的是trunk

sw1(config)#int g0/1
sw1(config-if)#sw ac
sw1(config-if)#sw access vl
sw1(config-if)#sw access vlan 12

查看sw1:

interface GigabitEthernet0/1
 switchport access vlan 12
 switchport trunk encapsulation dot1q
 switchport mode trunk

测试：

sw1#ping 192.168.11.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.11.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 11/23/41 ms
sw1#ping 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 11/21/41 ms
sw1#

sw2#ping 192.168.11.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.11.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 10/21/38 ms
sw2#
sw2#ping 192.168.12.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 10/32/64 ms
sw2#

（3）在access接口上添加命令switchport mode trunk，起作用的是trunk

interface GigabitEthernet0/1
 switchport access vlan 12
 switchport mode access
 
sw1(config)#int g0/1
sw1(config-if)#switchport trunk encapsulation dot1q 

!思科有些版本是需要配置封装encapsulation后，才能把模式修改成trunk
sw1(config-if)#switchport mo trunk
 
 查看：
 interface GigabitEthernet0/1
 switchport access vlan 12
 switchport trunk encapsulation dot1q
 switchport mode trunk

测试：

sw1#ping 192.168.11.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.11.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 11/23/41 ms
sw1#ping 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 11/21/41 ms
sw1#

sw2#ping 192.168.11.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.11.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 10/21/38 ms
sw2#
sw2#ping 192.168.12.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 10/32/64 ms
sw2#

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