From: Tarun Pahuja (pahujat@gmail.com)
Date: Tue Jun 05 2007 - 22:43:12 ART
Ali,
Static Routes to null 0 are used for various reasons (Avoid routing
loops, classless to classful redistribution, Black Holing, etc). Eigrp
creates route to Null 0 when summarizing for loop prevention. Manual static
routes to Null 0 are created in Black Holing and Classless to Classful
redistribution scenarios.
Static Routes can also be redistributed into a routing protocol using
"redistribute static" command.Whether the static route gets into routing
table depends on:
Whether the next hop address is reachable (if you use
static route pointing to a next hop)
OR
Whether the interface is up (if you use static route
pointing to an interface).
If one of these is true, an attempt is made to add the route to the
routing table; whether that succeeds depends on the administrative
distance of the route -- a lower administrative distance (the route
is "closer") than a preexisting route will cause the preexisting route
to be overwritten.
Regarding the Event Dampening Question, Please have a look at the following
link, it has a lot of configuration examples for event dampening.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ftipevdp.htm
Tarun Pahuja
CCIE#7707(R&S,Security,SP,Voice,Storage),CCSI
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