While connecting the EXOS device, we need to ensure that the STP priority of the EXOS switch is higher than the CISCO device.
configure stpd <domain name> priority <priority value>
The other possible work-around is to stop sending BPDUs on the port of the EXOS switch. However, the network has to be understood completely so that there is no loop if the STP is disabled on these ports.
configure stpd <domain name> vlan <vlan name> delete ports <port_list>