I am trying to implement a voice recording solution using SPAN on Cisco Cat3750s. We have 13 user switches that connect back to an aggregration switch at 100Mb FD. Each user switch has a SPAN session setup to send all Voice VLAN traffic to the aggregration switch via a 100Mb FD interface. The aggregration switch then has a SPAN session that uses all of the uplink ports to the user switches as sources and sends them to a destination port that has a voice recorder connected. The configs are
monitor session 1 source vlan (voice vlan)
monitor session 1 destination interface Gi1/0/2 (port to aggregation switch)
monitor session 1 source interface Gi1/0/1 - 13 (uplink ports to user switches)
monitor session 1 destination interface Gi1/0/24 (connection to voice recording server)
When we have more than 7 uplinks open on the aggreation switch its response times are impacted and it begins to work slowly. Does anyone know of any limitations on the number of SPAN source ports you can have?