BGP
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BGP Conditional Advertisement: advertise-map, exist-map, and non-exist-map
Every dual-homed network eventually asks the same question: how do I keep a backup path truly idle until I
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.
Latest
VXLAN with BGP EVPN: The Control Plane Fabrics Actually Use
VXLAN gives you the data plane: a way to wrap Ethernet in UDP and route it across a fabric. But
MPLS
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Troubleshooting MPLS L3VPN: Where VPN Routes Go Missing
An MPLS L3VPN route makes a long journey. It starts as an IP prefix in a customer's routing
MPLS
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RD vs RT: The Most Confused Concepts in MPLS L3VPN
Ask ten network engineers to explain the difference between a route distinguisher and a route target and you will get
MPLS
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PE-CE Routing Protocols in MPLS L3VPN: Static, OSPF, EIGRP, and BGP
Once the MPLS core is built and MP-BGP is carrying VPNv4 between your PEs, one question remains: how does
MPLS
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MPLS L3VPN Configuration Step by Step: VRF, RD, RT, and MP-BGP
MPLS L3VPN is the service that made MPLS a service-provider standard, and it is still what most enterprises are
BFD: Sub-Second Failure Detection for OSPF, EIGRP, and BGP
Routing protocols detect dead neighbors with hello timers measured in tens of seconds. Modern applications notice outages measured in hundreds
BGP
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BGP Configuration on Cisco IOS XE: eBGP and iBGP
BGP configuration is mechanically simple. The command set is small, and a basic peering comes up in half a dozen
BGP
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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.
BGP
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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.
OSPF
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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.
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