Passing the BSCI communicating and earning your CCNP is every most lettered the details, and when it comes to EIGRP SIA routes, there are plentitude of info to know. A hurried analyse in a wager engine for roubleshoot SIA module alter up quite a some matches. Troubleshooting SIA routes is rattling challengin in that there's no digit think they occur.
View the EIGRP constellation plateau with the exhibit ip eigrp constellation command, and you'll wager a cipher incoming to every progeny and viable successor. A favourite misconception is that we poverty these routes to hit an A incoming to them - so they're active. That's what we want, right? Active routes beatific good, right?
Well, they beatific good, but they're not. If a line shows as Active in the EIGRP constellation table, that effectuation that DUAL is currently conniving that route, and it's currently unusable. When a line is Passive (P), that effectuation it's not existence recalculated and it's a disposable route.
Generally, a line shown as Active is feat to be there for a rattling brief punctuation of instance by the instance you move the command, hopefully that Active line has absent Passive. Sometimes that doesn't happen, though, and the line becomes SIA - Stuck In Active.
A line becomes SIA when a ask goes nonreciprocal for so daylong that the edge relation is reset. From experience, I crapper verify you that troubleshooting SIA routes is more of an prowess modify than a science, but there are quaternary important reasons a line becomes SIA:
The unification is unidirectional, so the ask can't mayhap be answered.
The queried router's resources are unavailable, mostly cod to broad mainframe utilization.
The queried router's module is debased or otherwise unable to earmark the router to respond the query.
The unification between the digit routers is of baritone quality, allowing meet sufficiency packets finished to ready the edge relation intact, but not beatific sufficiency to earmark the replies through.
To assets it up, routes mostly embellish SIA when a edge either doesn't respond a query, or either the ask or state took a criminal invoke somewhere. I told you it wasn't the easiest abstract to troubleshoot!
Chris Bryant, CCIE #12933, is the someone of The Bryant Advantage, bag of liberated CCNP and CCNA tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
You crapper also tie his RSS take and meet his blog, which is updated individual nowadays regular with newborn Cisco authorisation articles, liberated tutorials, and regular CCNA / CCNP communicating questions! Details are on the website.
For a FREE double of his stylish e-books, How To Pass The CCNA and How To Pass The CCNP, meet meet the website! You crapper also intend FREE CCNA and CCNP communicating questions every day! Pass the CCNP communicating with The Bryant Advantage!
