Avaya Configuring XNS Services Manuel d'utilisateur télécharger pdf (Page 25)

XNS Overview

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• The address of the next-hop node to which packets destined for that network

will be forwarded

Routers maintain RIP tables by exchanging request and response packets. Routers

update their RIP tables with information from incoming response packets. The

header of each packet indicates the packet operation: request or response.

RIP request packets contain the number of the destination network in the header.

A RIP request packet may be one of the following types:

• A general request that a router broadcasts to determine the fastest route to all

networks on an internetwork. The value

FFFFFFFF in the network number

ﬁeld within the RIP data indicates that the packet is a general request.

• A speciﬁc request that a workstation or router broadcasts to determine the

fastest route to a particular network. One or more network numbers in the

network number ﬁeld within the RIP data indicates that the packet is a speciﬁc

request.

Routers at the destination network issue RIP response packets. RIP response

packets contain the network number and the number of hops and ticks required to

get to the network.

A RIP response may be one of the following types:

• A response to a request

• An informational broadcast from a router issued every 30 seconds

• An informational broadcast when a change occurs in the routing table;

examples are changes in cost information, changes to routes, aging of routes,

and additions of routes to networks new to the table

• An informational broadcast when an interface performs an orderly shutdown

procedure or initializes

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Avaya Configuring XNS Services Manuel d'utilisateur Page 25