6520X-EI交换机使用反射口方式进行二层远程镜像时，反射口对于镜像报文的处理

设备使用反射口方式实现二层远程镜像，1/0/3口作为源端口，1/0/5口作为反射口，vlan2是镜像vlan

[access-1]display mirroring-group 1                                             

Mirroring group 1:                                                             

    Type: Remote source                                                        

    Status: Active                                                             

    Mirroring port:                                                            

        Ten-GigabitEthernet1/0/3  Both                                          

    Reflector port: Ten-GigabitEthernet1/0/5                                    

    Remote probe VLAN: 2        

无

无

正常情况下，反射口能按照带宽全部反射，但是反射口在进行反射时，会在外层再加一层vlan标签，因此实际能反射的要略微小一点。

[access-1-Ten-GigabitEthernet1/0/33

<access-1>d c r i i                                                            

Usage: Bandwidth utilization in percentage                                     

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

XGE1/0/3                    97       8223763                --                --

XGE1/0/5                   100       8223749                --                --

XGE1/0/33                    0             1                --                --

 Overflow: More than 14 digits.                                                

       --: Not supported.                                                      

<access-1>

1）在镜像目的口是access口时：

[access-1-Ten-GigabitEthernet1/0/33]dis this                                   

#                                                                              

interface Ten-GigabitEthernet1/0/33                                            

 port link-mode bridge                                                         

 port access vlan 2                                                            

 flow-interval 5                                                                

#                                                                              

return                                                                         

[access-1-Ten-GigabitEthernet1/0/33]

<access-1>d c r o i                                                            

Usage: Bandwidth utilization in percentage                                     

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

XGE1/0/3                     0             0                --                --

XGE1/0/5                   100       8223804                --                --

XGE1/0/33                   97       8223802                --                --

 Overflow: More than 14 digits.                                                

       --: Not supported.                                                       

<access-1>

1）在镜像目的口是trunk口时：

[access-1-Ten-GigabitEthernet1/0/33]dis this                                   

#                                                                              

interface Ten-GigabitEthernet1/0/33                                            

 port link-mode bridge                                                          

 port link-type trunk                                                          

 undo port trunk permit vlan 1                                                 

 port trunk permit vlan 2                                                       

 flow-interval 5                                                               

#                      

[access-1-Ten-GigabitEthernet1/0/33]d c r o i                                  

Usage: Bandwidth utilization in percentage                                     

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

XGE1/0/3                     0             1                --                --

XGE1/0/5                   100       8224218                --                --

XGE1/0/33                  100       8223962                --                --

 Overflow: More than 14 digits.                                                

       --: Not supported.                                                      

[access-1-Ten-GigabitEthernet1/0/33]  

看端口统计信息，在为trunk口时如下：

Ten-GigabitEthernet1/0/3   

Input (total):  22172124 packets, 2838031872 bytes

Ten-GigabitEthernet1/0/5

Input (total):  22172133 packets, 2926721745 bytes 

Output (total): 22172133 packets, 2926721745 bytes        

Ten-GigabitEthernet1/0/33 

Output (total): 22172137 packets, 2926725061 bytes

相差部分：

（2926721745-2838031872）/22172124 = 4

这个4正好是vlan标签，4字节。