With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dmAllowedDomainIDListTable
Cisco Domain Management Allowed Domain ID List Table
1.3.6.1.4.1.9.9.302.1.1.5
This table contains list of allowed domain IDs in the local VSANs. So in a VSAN, domain IDs can be assigned only from the allowed list. All the domain IDs which are not allowed are reserved. Note that this is possible in a VSAN only if the local device is the principal switch in that VSAN.
Back to CISCO-DM-MIB MIB page.
IPHost Network monitor allows you to monitor dmAllowedDomainIDListTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.