From: Waters, Kivas (UK72) (Kivas.Waters@xxxxxxxxxxxxx)
Date: Thu Nov 29 2001 - 19:09:29 GMT-3
Configuring very specific route filters for route redistribution, split
horizon issues and general route filtering is important and I want to make
sure that I get it right in the lab. There appears to be a number of ways
of implimenting the route filters but what I'm interrested is the ACL's
defining the routes to be filtered. The question is, what type of route
filters should be used in which circumstances?
Here is an example ...
Lets say that I wanted to deny the following specific routes from being
learned by a routing process : 192.168.10.0/24 and 172.16.0.0/12
I suspect that answer c) is most correct but what do you IP routing guru's
think?
a)
access-list 7 permit 192.168.10.0
access-list 7 permit 172.16.0.0
b)
access-list 7 permit 192.168.10.0 0.0.0.255
access-list 7 permit 172.16.0.0 0.15.255.255
c)
access-list 117 permit 192.168.10.0 0.0.0.255 255.255.255.0 0.0.0.0
access-list 117 permit 172.16.0.0 0.15.255.255 255.240.0.0 0.0.0.0
best regards
Ki
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