Cisco Switch Command

I want to use a packet sniffer to monitor a Lan network inside the Wan. The Lan use a Catalyst switch 2900 XL series. Which command I should use to enable a port to catch all the traffic in the other ports?

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Inc

http://www.cisco.com/warp/public/473/41.html

Sample Configuration on the Catalyst 2900XL/3500XL

2900XL/3500XL SPAN Sample Configuration

!--- Output suppressed.

!
interface FastEthernet0/1
port monitor FastEthernet0/2
port monitor FastEthernet0/5
port monitor VLAN1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
switchport access vlan 2
!
interface FastEthernet0/4
port monitor FastEthernet0/3
port monitor FastEthernet0/6
switchport access vlan 2
!
interface FastEthernet0/5
!
interface FastEthernet0/6
switchport access vlan 2
!

!--- Output suppressed.

!
interface VLAN1
ip address 10.200.8.136 255.255.252.0
no ip directed-broadcast
no ip route-cache
!

!--- Output suppressed.