Catalyst 3560G SPAN session not mirroring IGMP packets

view full story

http://serverfault.com – I am developing a device which acts as a multicast host, and want to observe it as it responds to IGMP Queries. My Catalyst 3560G is set up as follows (full config below): Port 0/1 is a TFTP server allowing the device under test to boot. Port 0/3 is the device under test. Port 0/14 is my PC running wireshark, and ostinato for sending the IGMP query. Ports 0/1 and 0/3 are on a VLAN together, and port 0/14 is monitoring port 0/3, with ingress sent to that same VLAN. Those are the only three ports on the switch connected to anything. When I send the query, Wireshark captures the outgoing (HowTos)