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

Advanced routing is where theory meets reality. A protocol may look straightforward in isolation, but in a production network it has to coexist with others, follow business policies, and recover quickly from failure. Implementing Cisco Enterprise Advanced Routing and Services (300-410 ENARSI) teaches engineers how to manage that reality.

The course is organised around four practical questions every senior engineer must answer.

How do my routing protocols behave? You will examine EIGRP successors, feasible successors and stub routers, and OSPF network types, LSDB behaviour, special areas and virtual links. Both IPv4 and IPv6 address families are covered.

How do routes move and which path wins? Administrative distance, route maps, tags, summarisation and redistribution decide what ends up in the routing table. Policy-based routing and BFD give you finer control and faster convergence, while VRF-Lite separates routing domains on shared hardware.

How do I connect sites securely? BGP links the enterprise to providers and partners, and you will troubleshoot its neighbours, attributes, route reflectors, and policies. DMVPN, built on mGRE, NHRP and IPsec, creates dynamic hub-and-spoke and spoke-to-spoke tunnels. MPLS and Layer 3 VPN concepts complete the WAN picture.

How do I protect and monitor the network? AAA, ACLs, uRPF, CoPP, and IPv6 first-hop security harden the infrastructure. SNMP, syslog, conditional debugs, DHCP, IP SLA, NetFlow, and Cisco Catalyst Center Assurance help you find and fix faults.

Answering these questions gives learners a complete, troubleshooting-first view of enterprise routing and a clear path towards the 300-410 ENARSI exam.

Course Objectives

What you will be able to do after the course:

• Master interior routing: Troubleshoot EIGRP and OSPFv2/v3, including adjacencies, authentication, area types, metrics and path preference.
• Control the routing table: Apply administrative distance, route maps, summarisation and redistribution without creating loops.
• Engineer the path: Use policy-based routing, BFD and VRF-Lite to influence and isolate traffic.
• Run BGP with confidence: Troubleshoot iBGP and eBGP peers, attributes, best-path selection, route reflectors and policies.
• Build secure overlays: Configure single-hub DMVPN and explain MPLS operations and Layer 3 VPNs.
• Harden the router: Troubleshoot AAA, IPv4 ACLs, IPv6 filters, uRPF and CoPP, and describe IPv6 first-hop security.
• Keep services healthy: Troubleshoot device management, SNMP, logging, DHCP, IP SLA, NetFlow, and Catalyst Center Assurance.