With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dot3adAggPartnerSystemPriority
dot3ad Agg Partner System Priority
1.2.840.10006.300.43.1.1.1.1.9
A 2-octet read-only value that indicates the priority value associated with the Partner's System ID. If the aggregation is manually configured, this System Priority value will be a value assigned by the local System.
Back to IEEE8023-LAG-MIB MIB page.
IPHost Network monitor allows you to monitor dot3adAggPartnerSystemPriority on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.