ShowIPRoute

Networking. Security.
Tech Insights.

Deep dives into BGP, Cisco ISE, routing protocols, and network engineering. Written by a network engineer, for curious minds.

10Published Posts
BGPISERouting
Core Topics
2026Since
·21 min read

Understanding RADIUS Dead Criteria and Deadtime on IOS XE

How IOS XE decides that a RADIUS server is DEAD, how deadtime keeps it out of rotation, and how automatic testing brings it back before the timer expires.

RADIUSAAAISEIOS XESecurity
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·11 min read

How Can a Route Reflector Reflect L3VPN Routes Without a Local VRF?

Route reflectors can retain and propagate VPNv4 Unicast routes without a local VRF. This post explains why by comparing RT filtering on IOS XE and IOS XR.

BGPCiscoIOS XEIOS XRMPLS L3VPN
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·15 min read

The Hidden Mechanics of BGP UPDATE Message Handling

A practical walkthrough on how BGP network announcements are handled for eBGP and iBGP on IOS XE and IOS XR platforms.

BGPRoutingIOS XEIOS XR
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·25 min read

Is Enabling a New BGP Address Family Really Safe?

Enabling a new BGP address family on an established session is not always harmless. Discover why and how to avoid unexpected outages.

BGPRoutingIOS XE
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·7 min read

Terraform Associate (004): A Network Engineer's Journey

A network engineer's experience preparing for the HashiCorp Terraform Associate (004) certification, with resources and takeaways.

TerraformIaC
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·13 min read

BGP Safe Policy Enforcement in IOS XE

In IOS XR, eBGP sessions require explicit routing policies before exchanging routes. This post examines how IOS XE achieves the same results through a dedicated feature.

BGPRoutingIOS XE
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·7 min read

The Myth of eBGP Multihop Sessions Between Loopback Interfaces

External BGP sessions require a specific configuration to be established across multiple hops. What happens when the session is built between the Loopback interfaces of two adjacent nodes?

BGPRoutingIOS XE
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·7 min read

Managing Configuration Comments on IOS XR

In IOS XR, comments can be added, modified, and removed directly within the configuration, and attached to commits. This post explores each of these operations with practical examples.

IOS XR
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·22 min read

Cisco ISE Administrator Accounts: CLI and GUI Access

Explore how to create, manage, and monitor Cisco ISE administrator accounts using CLI and GUI, including roles, permissions, and password policies.

ISESecurity
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·2 min read

Hey, what? Another blog?

After years of tinkering with networking and tech, I finally decided to put my thoughts on a blog! In this first post, I’ll share why I created this little corner to share my ideas and insights.

General
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