![]() The queried router’s memory is corrupt or otherwise unable to allow the router to answer the query. The queried router’s resources are unavailable, generally due to high CPU utilization. The link is unidirectional, so the query can’t possibly be answered. From experience, I can tell you that troubleshooting SIA routes is more of an art form than a science, but there are four main reasons a route becomes SIA: Sometimes that doesn’t happen, though, and the route becomes SIA – Stuck In Active.Ī route becomes SIA when a query goes unanswered for so long that the neighbor relationship is reset. Generally, a route shown as Active is going to be there for a very short period of time by the time you repeat the command, hopefully that Active route has gone Passive. When a route is Passive (“P), that means it’s not being recalculated and it’s a usable route. If a route shows as Active in the EIGRP topology table, that means that DUAL is currently calculating that route, and it’s currently unusable. That’s what we want, right? Active routes sound good, right? A popular misconception is that we want these routes to have an “A” next to them – so they’re active. View the EIGRP topology table with the show ip eigrp topology command, and you’ll see a code next to every successor and feasible successor. Troubleshooting SIA routes is very challengin in that there’s no one reason they occur. A quick check in a search engine for “troubleshoot SIA” will bring up quite a few matches. Passing the BSCI exam and earning your CCNP is all about knowing the details, and when it comes to EIGRP SIA routes, there are plenty of details to know.
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