BGP

Border Gateway Protocol, the path-vector protocol that holds the internet together and increasingly runs inside enterprise data centers. Articles tagged BGP cover fundamentals, neighbor states, path attributes, best-path selection, traffic engineering, and Cisco IOS XE configuration.

39 posts

BGP weight Cisco path attribute feature image, PingLabz

BGP

BGP Weight: The Cisco-Only Path Attribute (and When to Use It)

BGP weight is the first tiebreaker in the path-selection algorithm, set locally and never propagated. The three ways to set it, how it compares to LOCAL_PREF, and worked examples.

May 24, 2026 5 min read

BGP looking glass feature image, PingLabz

BGP

BGP Looking Glass: What It Is, Public Servers, and Hosting Your Own

BGP looking glasses explained: what they show, the public servers worth bookmarking, a four-step troubleshooting recipe, and how to host your own with hyperglass.

May 21, 2026 5 min read

OSPF

OSPF vs BGP Redistribution: Which Protocol Wins Which Tie

When OSPF and BGP both know about the same prefix, who wins? A practical walkthrough of mutual redistribution, the admin-distance trap, and why BGP into OSPF needs a filter or it takes down your domain.

May 18, 2026 5 min read

BGP Field Reference (9-Page Printable Cheat-Sheet)

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BGP

BGP Field Reference (9-Page Printable Cheat-Sheet)

BGP has a lot of moving parts. The state machine. The 13-step path-selection algorithm. The dozen knobs that influence which

May 8, 2026 3 min read

GRE

Routing Protocols Over GRE: OSPF, EIGRP, BGP

Run OSPF, EIGRP, and BGP across GRE tunnels on Cisco IOS XE. Recursive routing fix, OSPF network types, EIGRP metric tuning, and BGP update-source.

May 1, 2026 8 min read

MPLS

MPLS L3VPN with MP-BGP and VPNv4

MPLS L3VPN architecture: VRFs, Route Distinguishers, Route Targets, MP-BGP for VPNv4, the two-label stack, PE-CE routing, and the Cisco IOS XE configuration.

Apr 26, 2026 7 min read