A Cisco 2950G-24-EI switch is directly attached to an Alcatel Omnicore 5022 which is configured as the Root Bridge for spanning-tree. The 2950G and the Omnicore are configured to run 802.1s spanning-tree. However, the 2950G cannot see the Omnicore as the Root Bridge and so 802.1s is not running between the two and so layer 2 loops are an issue. Has anyone come across interoperability issues for 802.1s between Alcatel and Cisco?