Implementing Cisco Enterprise Advanced Routing and Services (300-410 ENARSI)

In a network that cannot afford downtime, routing has to be both resilient and predictable. Traffic must take the intended path under normal conditions, switch quickly when a link fails and never fall into a loop when routes are shared between protocols. Implementing Cisco Enterprise Advanced Routing and Services (300-410 ENARSI) gives engineers the knowledge to deliver that level of control.

The course starts with interior routing in depth. You will troubleshoot EIGRP neighbour relationships, stub routing and unequal-cost load balancing, and analyse OSPFv2 and OSPFv3 network types, special areas, router roles and virtual links. Each protocol is covered for both IPv4 and IPv6.

Path control is a major theme. You will learn how administrative distance, route maps, tags and summarisation shape the routing table, how mutual redistribution can be made safe, and how policy-based routing combined with IP SLA tracking steers traffic based on real conditions. BFD accelerates failure detection, while VRF-Lite separates traffic on shared infrastructure.

BGP is covered in detail for enterprise edge, and multi-provider designs require: neighbour states and timers, authentication, multihop peering, 4-byte AS numbers, attributes, best-path selection, route reflectors, and inbound and outbound policies.

For site connectivity, you will configure single-hub DMVPN with mGRE, NHRP, IPsec, and spoke-to-spoke tunnels, and study how MPLS and Layer 3 VPNs operate in provider networks.

The course closes with infrastructure security and services, including AAA, ACLs, uRPF, CoPP, IPv6 first-hop security, SNMPv3, logging, DHCP, NetFlow, and Cisco Catalyst Center Assurance. The result is practical, exam-aligned Cisco ENARSI training for engineers responsible for critical enterprise networks.

Course Objectives

• Troubleshoot EIGRP and OSPFv2/v3 operation, including adjacencies, authentication, area and network types, metrics and path preference.
• Analyse and correct routing behaviour using administrative distance, route maps, tagging, summarisation and loop-prevention mechanisms.
• Implement safe redistribution between routing protocols and routing sources.
• Configure policy-based routing and VRF-Lite, and describe how BFD improves convergence.
• Troubleshoot iBGP and eBGP neighbours, path attributes, best-path selection, route reflectors and routing policies for IPv4 and IPv6.
• Configure single-hub DMVPN with NHRP and IPsec, and describe MPLS operations and Layer 3 VPNs.
• Troubleshoot router security and infrastructure services, including AAA, ACLs, uRPF, CoPP, SNMP, DHCP, IP SLA, and NetFlow.