Mutual Redistribution & Route Tagging
A redistribute statement that matches, tags, logs nothing, and installs nothing. Find what EIGRP is missing, live, right below.
Symptom
Two ASBRs mutually redistribute OSPF and EIGRP on the same ring. Learn why that creates route feedback, and how tagging and seed metrics keep it under control.
Your mission
Inspect, recover, then verify
Format
Cisco IOS CLI
Investigate before you configure.
Use the CLI evidence to isolate the fault, make the smallest safe correction, then verify the network state changed.
Observe the symptom and link state.
Diagnose by comparing the protocol evidence.
Verify the expected device state and confirm the original symptom is resolved.
Console access: R5 (EIGRP domain) · R3 (border, broken) · R4 (border, working)
This workspace stacks for portrait phones. Rotate to landscape for the full split-screen console.
Need a hint?
Reveal the root cause when you're ready.
Try the investigation first, then use this as your escape hatch, not a dead end.
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Lab debrief
Turn the session into a repeatable troubleshooting pattern.
Use this reference after your attempt: first explain the symptom, then verify the evidence, then confirm the repair.
The problem
Redistribution and route tagging are both configured, but one border router's routes into the EIGRP domain vanished after a change. The route-map still matches and tags correctly, and there's no error in the logs, yet half the redistributed prefixes are simply gone from the EIGRP topology table.
What you'll practice
- Build mutual redistribution between OSPF and EIGRP at two independent border routers
- Use route tagging to mark which domain a redistributed prefix actually originated in
- Recognize the route-feedback risk created by having two redistribution points on a ring
- Diagnose a missing EIGRP seed metric, a classic silent redistribution failure
- Trace a single prefix's tag and route type through both RIBs at each border
The topology
Six Cisco IOS routers in a ring: two pure-OSPF routers, two pure-EIGRP routers, and two dual-protocol border routers that mutually redistribute on both sides, so a prefix from either domain can legitimately reach the other one two different ways.
Commands to run yourself
The real diagnostic commands for this lab, copy-paste ready. Run these in the same order to reproduce the investigation on your own session.
show ip eigrp topology 10.10.30.0/24show running-config | section router eigrpshow route-map OSPF-TO-EIGRPTopology diagram
Fact-checked references
The commands and behaviour in this lab were checked against these primary references.
Frequently asked
What runs in the browser, and how does it differ from a live lab?
This page uses a focused browser simulation with modeled commands and device state. It is not a full device operating system. Hosted Network Lab sessions are a separate product; check the available topology and booking details before purchasing hosted time.
Does this cover the CCNP ENARSI exam topics?
Yes. Mutual redistribution, route tagging, route-maps, and seed metrics are core ENARSI (300-410) blueprint topics, and this is one of the higher-value integrated labs because it combines all of them in one topology.
Ready to run this lab yourself?
No setup, no image sourcing. Book a session or ask for a live demo.