In the world of Professional Services, “assumptions” are where migrations go to die. One of the most common traps I see engineers fall into when migrating from legacy Cisco IOS to Cisco Nexus (NX-OS) is assuming that BGP Route Redistribution behaves the same way.
If you treat NX-OS like IOS, you might accidentally flood your BGP table with OSPF external prefixes you never intended to advertise. In this video-based article, we break down the mechanics and commands and present a lab demo comparing the two.
Summary
| Feature | Cisco IOS Behavior | Cisco NX-OS Behavior |
|---|---|---|
| Default Scope | Redistributes OSPF Internal Routes only. | Redistributes All OSPF Routes (Internal & External). |
| Route-map Requirement | Optional (but recommended) | Mandatory (Syntax requirement) |
| redistribue command keywords | match internal external | No extra keywords |
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Additional Resources:
Configure Route Redistribution on Nexus Switches
BGP Path Attributes: Your BGP Path Selection Master Guide
BGP Protocol, How to Troubleshoot BGP Peering Issues?
[3 Ways] How To Advertise BGP Default Routes (With LAB Demo)
Practical BGP Regular Expressions Explained (AS-Path Lab Demo)
