# Routing Policy Published articles for Routing Policy. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## Using Cisco Prefix Lists Inside Route Maps for BGP Filtering DevFeed: [Using Cisco Prefix Lists Inside Route Maps for BGP Filtering]() Original publisher: [Read original article]() Author: j2sw Published: 2026-08-11T14:48:44Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [BGP](), [Cisco](), [Network]() Tags: [bgp](), [bgp-filtering](), [cisco](), [internet-architecture](), [network-engineering](), [network-engineering-resources](), [prefix-lists](), [route-maps](), [routing-policy]() ### AI overview This tutorial explains how Cisco prefix lists and route maps work together for BGP filtering. Prefix lists define which routes match, while route maps apply actions such as permitting, denying, or modifying route attributes. It also describes route-map sequence order and implicit deny behavior. ### Source excerpt Prefix lists define which BGP routes match a policy. Route maps use those matches to permit routes, deny them, or change attributes such as local preference. The post Using Cisco Prefix Lists Inside Route Maps for BGP Filtering appeared first on Justin Wilson (j2sw). ## The Third App from J2sw: Prefix Advertisement Checker DevFeed: [The Third App from J2sw: Prefix Advertisement Checker]() Original publisher: [Read original article]() Author: j2sw Published: 2026-07-31T12:17:00Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [BGP](), [networking](), [App](), [Cisco](), [MikroTik]() Tags: [application](), [bgp](), [irr](), [j2-networks](), [j2-updates](), [network-engineering-resources](), [network-tools](), [network-troubleshooting](), [prefix-advertisement](), [ripe-ris](), [roa](), [routing](), [routing-policy](), [rpki](), [visibility]() ### AI overview This article describes the J2SW Prefix Advertisement Checker, an application that evaluates an exact IPv4 or IPv6 prefix using live BGP data. It reports observed origin ASNs from RIPE RIS collectors, collector visibility, RPKI/ROA status, and matching IRR route objects, with an optional expected origin ASN for comparison. ### Source excerpt A prefix can appear in the global BGP table and still have a routing problem. The route may originate from the wrong ASN. Its ROA may also authorize a shorter prefix but reject the advertised prefix length. Checking each part normally means pulling data from several routing tools. The J2SW Prefix Advertisement Checker, my 3rd ... Read more The post The Third App from J2sw: Prefix Advertisement Checker appeared first on Justin Wilson (j2sw). ## Introducing the J2SW BGP Community Builder DevFeed: [Introducing the J2SW BGP Community Builder]() Original publisher: [Read original article]() Author: j2sw Published: 2026-07-29T18:30:21Z Content type: release Language: en Sources: [Justin Wilson (j2sw)]() Topics: [BGP](), [networking](), [Routing (disambiguation)](), [configuration]() Tags: [aws-direct-connect](), [bgp](), [bgp-communities](), [builder](), [cisco](), [cogent](), [frrouting](), [hurricane-electric](), [juniper](), [mikrotik](), [network-engineering-resources](), [ntt](), [routing-policy]() ### AI overview The J2SW BGP Community Builder helps users select documented provider communities and routing actions, then generates scoped configuration fragments. It includes RFC well-known communities and policies from AWS Direct Connect, NTT DATA, Hurricane Electric, and Cogent Communications, with support for MikroTik RouterOS 7, Cisco IOS-XE, Juniper Junos, and FRRouting. ### Source excerpt The J2SW BGP Community Builder selects documented provider communities and generates scoped policy fragments for MikroTik, Cisco, Junos, and FRRouting. The post Introducing the J2SW BGP Community Builder appeared first on Justin Wilson (j2sw). ## Understanding BGP Route Types: Full Routes vs Partial vs Default vs Customer Routes DevFeed: [Understanding BGP Route Types: Full Routes vs Partial vs Default vs Customer Routes]() Original publisher: [Read original article]() Author: j2sw Published: 2026-07-24T16:28:00Z Content type: article Language: en Sources: [Justin Wilson (j2sw)]() Topics: [BGP](), [networking](), [Routing (disambiguation)](), [Internet](), [gateway](), [Networks]() Tags: [bgp](), [cpu](), [flexibility](), [internet-architecture](), [isp](), [memory](), [network-engineering](), [network-operations](), [route](), [router](), [routing](), [routing-policy](), [routing-table](), [traffic-engineering](), [visibility]() ### AI overview This article explains BGP route choices, comparing default routes, full routes, partial routes, and customer routes. It describes the tradeoffs between small routing tables, Internet visibility, traffic engineering control, and router resource requirements. ### Source excerpt 5 minute read time.Justin Wilson j2sw.com When you configure a BGP session, one of the first questions is what routes you actually want to receive. If you have ever filled out a questionnaire with Hurricane Electric or another transit provider, they ask you what "kind" of routes you want. In this article, I plan to ... Read more The post Understanding BGP Route Types: Full Routes vs Partial vs Default vs Customer Routes appeared first on Justin Wilson (j2sw).