the ip addressing scheme is hierarchical, and ip routers make hierarchical decisions.
recall that an ip address comprises a prefix part and a host part (suffix).
a router has to know only how to reach the next hop it does not have to know the details of how to reach an end node that is not local.
routers use the prefix to determine the path for a destination address that is not local. the host part is used to reach local hosts.
with route summarization, also referred to as route aggregation or supernetting, one route in the routing table represents many other routes.
summarizing routes reduces the routing updating traffic and reduces the number of routes in the routing table and overall router overhead in the router receiving the routes.
in a hierarchical network design, effective use of route summarization can limit the impact of topology changes to the routers in one section of the network.
forsummarizationtoworkcorrectly,thefollowingrequirementsmustbemet:
?multipleipaddressesmustsharethesameleftmostbits.
?routersmustbasetheirroutingdecisionsona32-bitipaddressandaprefixlengthofupto32bits.
?routingprotocolsmustcarrytheprefixlengthwiththe32-bitipaddress.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
|