Попытка поднять RSPAN: (2) - cisco WS-C3560G-24TS 
(1) - cisco WS-C2950-24 
схема : server --- fa0/20 (1)-- trunk--(2) 
                                                      
На (2): 
+monitor session 1 source interface Gi0/22 
+monitor session 1 destination remote vlan 998 
VLAN Name Status Ports 
---- -------------------------------- --------- ------------------------------- 
998 RSPAN active Gi0/24 
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 
998 enet 100998 1500 - - - - - 0 0 
Remote SPAN VLAN 
---------------- 
Enabled 
#sh monitor session 1 detail 
Session 1 
--------- 
Type : Remote Source Session 
Source Ports : 
        RX Only : None 
        TX Only : None 
        Both : Gi0/22 
Source VLANs : 
        RX Only : None 
        TX Only : None 
        Both : None 
Source RSPAN VLAN : None 
Destination Ports : None 
Filter VLANs : None 
Dest RSPAN VLAN : 998 
interface GigabitEthernet0/24 
  description Link to 1 
  switchport trunk encapsulation dot1q 
  switchport trunk allowed vlan 3,500-526,528-600,613,636,998,1002-1005 
  switchport mode trunk 
  switchport nonegotiate 
  logging event trunk-status 
  logging event spanning-tree 
  logging event status 
на (1): 
+monitor session 1 destination interface Fa0/20 
+monitor session 1 source remote vlan 998 
#sh monitor session 1 
Session 1 
--------- 
Type : Remote Destination Session 
Source RSPAN VLAN : 998 
Destination Ports : Fa0/20 
        Encapsulation : Native 
                    Ingress: Disabled 
#sh vl id 998 
VLAN Name Status Ports 
---- -------------------------------- --------- ------------------------------- 
998 RSPAN active Fa0/1, Fa0/2, Fa0/3, Fa0/7, Fa0/9, Fa0/10, Fa0/11, Fa0/17, Fa0/21, Fa0/22 
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 
998 enet 100998 1500 - - - - - 0 0 
Remote SPAN VLAN 
---------------- 
Enabled 
interface FastEthernet0/1 
  description Ulink to 2 
  switchport trunk allowed vlan 3,500,575,613,636,998 
  switchport mode trunk 
  logging event spanning-tree status 
  logging event trunk-status 
interface FastEthernet0/20 
  description -- to 2-ports Server 
  switchport mode trunk 
  switchport nonegotiate 
  load-interval 60 
  spanning-tree portfast 
  spanning-tree bpdufilter enable 
итог : не вижу трафика