With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
clGroupMainClock
cl Group Main Clock
1.3.6.1.4.1.81.16.1.1.1.3
Value of this attribute is an index into clPortTable, and defines the clock that should operate or a main clock in redundancy scheme. Serves as 'Clock selection' switch on the card.
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IPHost Network monitor allows you to monitor clGroupMainClock on Avaya device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Avaya routers right now.