Network engineers targeting the Avaya Ethernet Routing Switch implementation and maintenance certification must demonstrate proficiency in deploying and troubleshooting ERS 4000, 5000, and 8000 series hardware. Technical requirements prioritize the configuration of Layer 2 switching protocols including 802.1Q VLANs, Spanning Tree Protocol variants, and Link Aggregation Control Protocol. Candidates must execute advanced Layer 3 routing operations utilizing OSPF and static routing while implementing Quality of Service policies for traffic prioritization. Proficiency in device management via CLI and SNMP, along with rigorous maintenance procedures such as firmware upgrades and system monitoring, ensures optimal infrastructure stability within enterprise fabric-enabled campus environments.