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1) The DWDM SFPs have a high TX power as they are long range SFPs. Hence attenuators have to be used while connecting them. If attenuators are not available then the cable into one of the SFPs need to be loosely inserted. Only then will the link come...
Devnet Sandbox for Cisco 8000 SONiC Notebook is live now. Click here to explore the sandbox : https://devnetsandbox.cisco.com/RM/Diagram/Index/219b721f-4116-4e47-adfa-c41ab540ca22?diagramType=Topology
Thanks,
Sarah