Cisco IOS SPAN and RSPAN

Laz,
I have configured a trunk ports between three 3560 switches. Confirmed that the trunk is good and working.

On SW2 and SW3 configured the following two lines:

monitor session 1 source interface Fa0/13 , Fa0/23
monitor session 1 destination remote vlan 999

Note: vlan 999 is configured as a remote vlan. Also VTP version 1 with a domain name is configured and is working as expected.

On SW1, I have the following configured:

monitor session 1 source remote vlan 999
monitor session 1 destination interface Fa0/48

I have connected my laptop to port fa0/48. I have started capturing packet, however, I am NOT seeing anything other than DHCP activities. What I am doing wrong?

Basically, I am trying to learn more about the spanning tree, so I have configured the RSPAN, however, I cannot see anything other than the Loop and DHCP Protocols. I would like to see the BPDU and everything else. Thanks!