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To monitor one Vlan, on a specific switch (here vlan 622 goes on port gi1/0/22):

(config)#monitor session 1 source vlan 622
(config)#monitor session 1 destination interface Gi1/0/22

To check if it's OK :

#show monitor session 1
Session 1
---------
Type                   : Local Session
Source VLANs           :
    Both               : 622
Destination Ports      : Gi1/0/22
    Encapsulation      : Native
          Ingress      : Disabled

To monitor one port (here port gi1/0/11 goes on port gi1/0/22):

(config)#monitor session 1 source interface gi1/0/11
(config)#monitor session 1 destination interface gi1/0/22

To monitor one Vlan, on all your switches (here vlan 500 goes on port gi1/0/22):

On all the switches :

(config)#vlan 21
config-vlan)#name RSPAN_VLAN_500
config-vlan)#remote-span
!
monitor session 2 source vlan 500 rx
monitor session 2 destination remote vlan 21

On the destination switch

monitor session 1 source remote vlan 21
monitor session 1 destination interface Gi1/0/22