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ipSpace.net

ipSpace.net

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Practitioner blog on networking.

Recent Posts

Netlab: Using L3VPN (MPLS/VPN) with SR-MPLS Core
News•Mar 2, 2026

Netlab: Using L3VPN (MPLS/VPN) with SR-MPLS Core

The article demonstrates how netlab can orchestrate a full‑scale MPLS/VPN lab using an SR‑MPLS core, combining Arista cEOS PE routers with FRRouting P routers in Docker containers. LDP is disabled, forcing IS‑IS‑based segment routing to handle label distribution, while two VRFs isolate customer traffic. Netlab’s YAML topology defines device roles, SRGB ranges, and visual graph settings, enabling rapid deployment on any Linux VM or GitHub Codespaces. Sample commands and output illustrate label assignment and SR prefix segments.

By ipSpace.net
Lab: More Complex EVPN/VXLAN Bridging Scenario
News•Feb 27, 2026

Lab: More Complex EVPN/VXLAN Bridging Scenario

The latest EVPN/VXLAN lab adds a more complex bridging scenario where several EVPN MAC‑VRFs are each mapped to separate VLAN segments on individual PE devices. The topology includes three routers interconnected via an IPv4 underlay running OSPF and iBGP, and...

By ipSpace.net
Configuring 6PE Route Reflector on Cisco IOS
News•Feb 26, 2026

Configuring 6PE Route Reflector on Cisco IOS

Deploying a BGP route reflector for MPLS 6PE or L3VPN on Cisco IOS requires IPv6 routing to be enabled, even when the device never forwards IPv6 traffic. Without the "ipv6 unicast-routing" command, IOS rejects IPv6 address‑family configuration, causing integration tests to...

By ipSpace.net
On AI Agents Speaking BGP
News•Feb 25, 2026

On AI Agents Speaking BGP

A recent proof‑of‑concept demonstrates an AI‑driven natural‑language interface that talks directly to a custom BGP daemon. The author argues that existing open‑source BGP suites like FRRouting already provide machine‑readable JSON and can be wrapped with simple REST APIs. Reinventing a...

By ipSpace.net
Interesting: Open Space Events
News•Feb 24, 2026

Interesting: Open Space Events

Martin Fowler highlighted Open Space events as a self‑organizing format where participants set the agenda on the fly. The approach offers a structured yet flexible alternative to informal gatherings like Net::Beer, making it attractive for small tech meetups such as...

By ipSpace.net
Netlab: The Caveats of Using Startup Configurations
News•Feb 23, 2026

Netlab: The Caveats of Using Startup Configurations

Petr Ankudinov warns against relying on containerlab's startup‑config option for netlab deployments. While containerlab can apply partial startup configurations to most devices, it only supports complete startup files for Arista cEOS, forcing netlab to duplicate initial device setup. Errors in...

By ipSpace.net
Public Videos: EVPN in MPLS-Based Environments
News•Feb 20, 2026

Public Videos: EVPN in MPLS-Based Environments

The article announces that Krzysztof Szarkowicz’s presentation on EVPN in MPLS‑based environments is now publicly available as part of the EVPN Technical Deep Dive webinar series. While EVPN is often discussed alongside VXLAN, its original purpose was to serve as...

By ipSpace.net
Cisco IOS/XR OSPFv2 Not-So-Passive Interfaces
News•Feb 19, 2026

Cisco IOS/XR OSPFv2 Not-So-Passive Interfaces

Cisco IOS/XR 25.2.1 violates the OSPF passive‑interface contract by still emitting OSPFv2 Hello packets. The router sends two hellos on a supposedly passive link, then stops, leaving the neighbor in the Init state and causing netlab integration tests to fail....

By ipSpace.net
EVPN IP-VRFs on Cisco IOS/XE: Configuration Notes
News•Feb 18, 2026

EVPN IP-VRFs on Cisco IOS/XE: Configuration Notes

The author explains how to get EVPN IP‑VRFs with transit VXLAN working on Cisco IOS/XE, emphasizing the need to configure an explicit VLAN on switch images or a bridge‑domain on router images for the transit VNI. He outlines the required...

By ipSpace.net