From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Thu Oct 17 2002 - 12:32:13 GMT-3
Simply put, a router will respond at once when queried
about something it never heard about. And that something is a
route, i.e., a network with a given mask.
So if you have:
net1
|-R1-/-R2-/-R3 ...
and R2 is summarizing net1 into something larger, then when net1
goes down, R1 asks R2 for an alternative, which in turn asks R3,
which answers at once "what ?" :-)
Had not been summarization in place, the query would propagate to
all places, trying to find alternative paths to a local network.
Rick wrote:
> Can somebody explain how simply summarizing a set of routes to the core of the
> network will stop the query from propagating into the core of the network?
> My goal is to reduce my query scope to prevent SIA routes.
>
> Thanks,
>
> Rick
>
-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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