Avaya Configuring IP Services Bedienungsanleitung Seite 136

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Configuring IP Services
4-60 117356-A Rev. A
For example, consider a router that advertises an aggregate route using the
supernet address 192.32.0.0/255.255.248. The supernet address represents eight
specific networks: 192.32.0.0 to 192.32.7.0. Once the aggregate route has been
propagated, the router receives network traffic for each of these specific
destinations.
At some point, the router loses connectivity to network 192.32.3.0, one of the
networks in the supernet. The router continues to forward traffic that matches
destinations 0.0 to 2.0 and 4.0 to 7.0. However, the router can no longer find a
complete match in the routing table for the disconnected network, 3.0. The router
must drop all traffic destined for 192.32.3.0.
To force the router to drop the packet for an unmatched destination, you configure
a special type of static route for a supernet called a black hole:
Enter the supernet address/mask pair as the destination IP address and address
mask.
To create the black hole, enter the black hole encoding (255.255.255.255) as
the next-hop address and the next-hop mask.
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