Just a note:
Summary: Installation: Lowest Administrative distance (all other routes
are discarded until new 'election' during the updates when the route is
failed)
Forwarding: Longest Match + Destination IP WITHIN the RANGE
After reading the article below, I want to point out that the DESTINATION IP
plays an important role in addition to the longest match when forwarding
decision is made, because it has to determine whether IP is within the
range. For example, if there are THREE routes to the network with three
different Prefixes (NOTE: Since they have different prefixes, they will be
entered as separate routes in routing table) and destination IP lies within
the range of ONLY two routes, then the LONGEST of the TWO Routes will be
chosen to forward the packets. In the example given in this question, /28
is the route to be forwarded. So, do not just simply look the longest prefix.
Thanks, Frank for the url. It does explains it very good.
Good reading on this:
http://www.cisco.com/warp/public/105/21.html
SP
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=16945&t=16797
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