With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dmEnable
Cisco Domain Management Enable
1.3.6.1.4.1.9.9.302.1.1.1.1.3
Enables the Domain Manager on this VSAN. If enabled on an active VSAN, the switch will participate in principal switch selection. If disabled, the switch will participate in neither the principal switch selection nor domain allocation. Thus, Domain ID needs to be configured statically.
Back to CISCO-DM-MIB MIB page.
IPHost Network monitor allows you to monitor dmEnable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.