User's Manual

70-4
70.3 Typical Examples of RSPAN
Before RSPAN is invented, network administrators had to connect their PCs directly to the switches, in order
to check the statistics of the network.
However, with the help of RSPAN, the network administrators can configure and supervise the switches
remotely, which brings more efficiency. The figure below shows a sample application of RSPAN.
Figure
70-1 RSPAN Application Sample
Two configuration solutions can be chosen for RSPAN: the first is without reflector port, and the other is with
reflector port. For the first one, only one fixed port can be connected to the intermediate switch. However, no
reflector port has to be configured. This maximizes the usage of witch ports. For the latter one, the port
connected to the intermediate switch is not fixed. Datagrams can be broadcasted in the RSPAN VLAN
through the loopback, which is much more flexible.
The normal mode configuration is show as below:
Solution 1:
Source switch:
Interface ethernet 1/0/1 is the source port for mirroring.
Interface ethernet 1/0/2 is the destination port which is connected to the intermediate switch.
RSPAN VLAN is 5.
Switch(config)#vlan 5
Switch(Config-Vlan5)#remote-span
Switch(Config-Vlan5)#exit
Switch(config)#interface ethernet 1/0/2
Switch(Config-If-Ethernet1/0/2)#switchport mode trunk
Switch(Config-If-Ethernet1/0/2)#exit
Switch(config)#monitor session 1 source interface ethernet1/0/1 rx
Switch(config)#monitor session 1 destination interface ethernet1/0/2
Switch(config)#monitor session 1 remote vlan 5
Source Switch
E1
E2
E6
E7
E9
E10
Intermediate Switch
Destination Switch
PC1 Monitor