D-Link DES-3326S - Switch - Stackable Uživatelská příručka stáhnout pdf (Strana 143)

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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

Switch Management and Operating Concepts 143

authentication scheme.

Table 5-16. OSPF Packet Header

The Hello Packet

Hello packets are OSPF packet type 1. They are sent

periodically on all interfaces, including virtual links, in order to

establish and maintain neighbor relationships. In addition,

Hello Packets are multicast on those physical networks having

a multicast or broadcast capability, enabling dynamic discovery

of neighboring routers.

All routers connected to a common network must agree on

certain parameters such as the Network Mask, the Hello

Interval, and the Router Dead Interval. These parameters are

included in hello packets, so that differences can inhibit the

forming of neighbor relationships. A detailed explanation of the

receive processing for Hello packets, so that differences can

inhibit the forming of neighbor relationships.

The format of the Hello packet is shown below:

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 348 349

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