Avaya Configuring IP Services Manual do Utilizador descarregar pdf (Página 37)

100

101

Configuring IP Routers and Interfaces

2-9

For example, in Figure 2-3, the router and Host C are on the same physical

network. Both devices have an assigned IP address (the router’s is 140.250.200.1

and Host C’s is 140.250.200.4) and both devices have an assigned physical

address (the router’s is 00 00 A2 00 00 01 and Host C’s is 00 00 A2 00 10 40).

In Figure 2-3, the router wants to send a packet to Host C but knows only Host C’s

IP address. The router uses ARP to determine Host C’s physical address, as

follows:

1. The router broadcasts a special packet, called an ARP request, that asks IP

address 140.250.200.4 to respond with its physical address.

2. All network hosts receive the broadcast request.

3. Only Host C responds with its hardware address.

The router maps Host C’s IP address (140.250.200.4) to its physical address

(00 00 A2 00 10 40) and saves the results in an address-resolution cache for future

use.

Note: It is possible for the router to send out ARP requests even if ARP, which

is a dynamically loaded module, is not currently loaded on the router. It is the

responsibility of the network administrator to ensure that ARP is loaded

correctly on a slot. To do this through Site Manager, select Events

Manager

➔

Options

➔

Filters; then select LOADER and Debug, and do a

File

➔

Get Current Log File. Verify that ARP is loaded on a slot by locating the

following message in the log:

#xx:01/01/95 10:10:55.00 DEBUG SLOT x LOADER CODE:33

Loader service completed for ARP.EXE 0xxxxxxxxx

Site Manager allows you to select an address-resolution protocol for an IP interface. For

instructions, see the Address Resolution parameter on page 2-40. Site Manager also

allows you to select an ARP type for an interface conﬁgured for a Token Ring network. For

instructions, see the TR Endstation ARP Type parameter on page 2-51.

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