To transfer the BSCI exam, you requirement to undergo the disagreement between IRDP and HSRP. While they hit the aforementioned base function, the activeness and plan of apiece are totally different.
The intend of both is to earmark hosts to apace conceive a histrion router when the direct router fails. IRDP is commonly utilised by Windows DHCP clients and individual Unix variations, but you do wager it in Cisco routers as well. IRDP is circumscribed in RFC 1256.
IRDP routers module multicast Hello messages that patron devices hear. If a patron hears from more than digit IRDP router, it module opt digit as its direct and module move using the another router if the direct it's chosen goes down.
HSRP is a Cisco-proprietary prescript that is fashioned for hurried cutover to a alternative router if the direct fails, but the patron devices don't see either the direct or alternative router. The hosts ingest a realistic router as their choice gateway. This realistic router has its possess IP and MAC address! All the while, the router chosen as the direct is actually the digit doing the routing. If the direct router goes down, the alternative router apace takes over with no field gap to meshwork services.
The HSRP routers transmit by multicasting updates to 224.0.0.2, and its finished these hellos that the HSRP routers end which router is direct and which is secondary. HSRP is circumscribed in RFC 2281.
The plan of apiece of these module be awninged in a forthcoming tutorial. In the meantime, I propose you to feature the RFCs mentioned in this article, and meet www.cisco.com/univercd to feature most the configurations and options acquirable for both of these alive protocols.
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