From: Greg Wendel (gwendel@gmail.com)
Date: Mon Jun 02 2008 - 17:35:44 ART
From
http://www.cisco.com/en/US/products/ps6441/prod_bulletin09186a00804a8728.html
#wp1090207
2.2) Routing and Multicast 2.2.1) OSPF Mechanism to Exclude Connected
Prefixes
By default, when an OSPF router is connected to other OSPF routers via an IP
numbered link, it automatically includes prefixes of IP numbered links in
its advertisements. The OSPF Mechanism to Exclude Connected Prefixes feature
enhancement provides the ability to exclude directly connected prefixes from
advertising throughout the network.
When this feature is configured, IP numbered link prefixes will not be
advertised into the network, resulting in improved convergence times and
enhanced security by excluding internal network prefixes from being exposed
outside of the network.
*Key Benefits:*
*Improved convergence, scalability and performance:* by excluding prefixes
in OSPF advertisements, the network will converge faster, scale better.
Performance of routers is improved by dealing with less number of prefixes
in a network.
*Improved security:* by not advertising connected prefixes, OSPF area
border routers or autonomous system border routers will not be able to
advertise these prefixes outside of the network. This improves the security
of the network by not advertising connected prefixes to external entities.
-- Gregory Wendel Springfield VA, 22153
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