EIGRP Lab 6: Propagating a Default Route

Bundle lab · $29.99

Inject a static default route from an edge router into an EIGRP domain so internal routers and hosts gain internet reachability. You will verify the D*EX 0.0.0.0/0 on the internal router and validate end-to-end connectivity from a branch host through the edge to an ISP-side server.

Learning objectives

• Confirm an existing EIGRP adjacency and internal route exchange.
• Originate a default route by redistributing a static 0.0.0.0/0 into EIGRP on the edge router.
• Apply a valid EIGRP seed metric for redistribution on classic IOS.
• Validate that the internal router installs a D*EX 0.0.0.0/0 and sets a gateway of last resort.
• Prove end-to-end reachability from an internal host to an ISP-side server and interpret traceroute hops.

Troubleshooting focus

• If R2 does not learn a default, check that R1 actually has a static 0.0.0.0/0 to the ISP next-hop and that EIGRP is redistributing static.
• If redistribute static is present but no default appears, ensure a valid seed metric (or default-metric) is set for EIGRP external routes.
• If there is no EIGRP neighbor, confirm matching AS (100), correct network statements for 10.0.12.0/30, and default K-values.
• If the internal host can ping R2 but not the ISP, verify R2 shows a D*EX 0.0.0.0/0 via 10.0.12.1 and inspect the traceroute path.
• If return traffic from the ISP-side server fails, ensure the ISP router has a static route back to 10.0.0.0/8 via 203.0.113.1.