Cisco CCNP Certification / BSCI Exam Tutorial: Comparing IRDP And HSRP

To pass the BSCI exam, you need to know theone doing the routing. If the primary router goes
difference between IRDP and HSRP. While they havedown, the secondary router quickly takes over with
the same basic function, the operation andno major interruption to network services.The HSRP
configuration of each are totally different.The aim ofrouters communicate by multicasting updates to
both is to allow hosts to quickly discover a standby224.0.0.2, and its through these hellos that the HSRP
router when the primary router fails. IRDP isrouters decide which router is primary and which is
commonly used by Windows DHCP clients andsecondary. HSRP is defined in RFC 2281.The
several Unix variations, but you do see it in Ciscoconfiguration of each of these will be covered in a
routers as well. IRDP is defined in RFC 1256.IRDPfuture tutorial. In the meantime, I urge you to read
routers will multicast Hello messages that hostthe RFCs mentioned in this article, and visit to read
devices hear. If a host hears from more than oneabout the configurations and options available for
IRDP router, it will choose one as its primary and willboth of these vital protocols.Chris Bryant, CCIE
start using the other router if the primary it's chosen#12933, is the owner of The Bryant Advantage,
goes down.HSRP is a Cisco-proprietary protocol thathome of free CCNP and CCNA tutorials, The Ultimate
is designed for quick cutover to a secondary router ifCCNA Study Package, and Ultimate CCNP Study
the primary fails, but the host devices don't "see"Packages.You can also join his RSS feed and visit his
either the primary or secondary router. The hostsblog, which is updated several times daily with new
use a virtual router as their default gateway. ThisCisco certification articles, free tutorials, and daily
virtual router has its own IP and MAC address! All theCCNA / CCNP exam questions! Details are on the
while, the router chosen as the primary is actually thewebsite.