From: Hedlund, Brad (BHedlund@xxxxxxxxxxxx)
Date: Fri Apr 21 2000 - 14:50:22 GMT-3
>
> With OSPF you can summarize from a smaller subnets to larger
> ones, but you
> can also "summarize" from larger subnets to smaller one as
> well. Try it.
I tried that once and found a problem with it:
When you use "summary-address" in OSPF it creates an 'O' route pointing to
Null0 at the router you summarize from.
If you "summarize" a larger subnet into a smaller one (/22 to /24) then the
/24 route to Null0
will be the longest match for traffic going to that subnet. The router will
send that traffic to Null0, dropping the packets (not good!).
Brad Hedlund
Sr. Network Engineer
CCIE #5530
REAL Solutions, Elcamino Resources Ltd.
Eden Prairie, MN.
(952) 829-2877
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