With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
smartViNetStpDesignatedRoot
smart Vi Net Stp Designated Root
1.3.6.1.4.1.81.27.4.6.1.5
The bridge identifier of the root of the spanning tree as determined by the Spanning Tree Protocol as executed by this node. This value is used as the Root Identifier parameter in all Configuration Bridge PDUs originated by this node.
Back to SMARTD-MIB MIB page.
IPHost Network monitor allows you to monitor smartViNetStpDesignatedRoot on Avaya device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Avaya routing switches right now.