From: Hobbs (deadheadblues@gmail.com)
Date: Wed Dec 03 2008 - 22:10:03 ARST
Hello,
Please reference:
http://www.ciscosystems.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml#
As far as I can tell the order of operations for route filtering are (This
is the 3rd question on the FAQ):
For inbound updates the order of preference is:
1. route-map
2. filter-list
3. prefix-list, distribute-list
For outbound updates the order of preference is:
1. prefix-list, distribute-list
2. filter-list
3. route-map
However, further down is this question and answer (5th from the bottom):
Q. How can I filter all IP routes advertised to a BGP neighbor except the
default route 0.0.0.0/0?
A. The specific routes can be filtered if you use inbound filter-list,
distribute-list, prefix-list and route-map all at the same time for the same
bgp neighbor. This is the order of operation:
1. Filter-list
2. Router-map
3. Distribute-list (or) prefix-list
Is this last question conflicting the previous one?
What's the difference between only allowing a default route as opposed to
only allowing certain other routes?
thank you
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