Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manual de usuario descargar pdf (Pagina 121)

Configuring and Customizing IP

308627-14.20 Rev 00

3-61

Defining a Default Route

If IP receives a data packet with a destination address that it is unable to match in

its routing table, it looks for a default route that it can use to forward the packet.

To include a default route in the routing table, create a static route with a

destination address of 0.0.0.0. For the next-hop address, specify a router that can

forward the packet to its destination.

Defining a Static Black Hole for a Supernet

A router that advertises an aggregate route by using a supernet address to

represent multiple explicit routes must be able to discard packets that match the

supernet address, but that do not match any of the explicit routes.

For example, consider a router that advertises an aggregate route using the

supernet address 192.32.0.0/21. The supernet address represents eight specific

networks: 192.32.0.0 through 192.32.7.0. After the aggregate route has been

propagated, the router receives network traffic for each of these specific

destinations.

If 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

through 2.0 and 4.0 through 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.

5. Set the following parameters:

• Destination IP Address

• Address Mask

• Cost

• Next Hop Addr

• Preference

• Unnumbered CCT Name

Click on Help or see the parameter

descriptions beginning on page A-27.

6. Click on OK. You return to the IP Static Routes

window.

Site Manager Procedure

(continued)

You do this System responds

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Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manual de usuario Pagina 121