How to SPAN ACE port for ethereal?

Instructions for spanning the ACE Tengig port.

Let's say your ACE is in slot 3. It's backplane interface would then be Te3/1. You then use the monitor command to configure the source (SPAN) port to this interface.

monitor session 1 source interface TenGigabitEthernet 3/1 both
monitor session 1 destination interface GigabitEthernet x/y

Configure the destination (SPAN) port as a trunk port so that the VLAN IDs will be preserved:

interface Gix/y
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate

Wireshark tool

Playing with ethereal captures is a lot fun. Sometimes major issues are cracked with the help of tcp dumps analyzing tools.

http://wiki.wireshark.org/DisplayFilters