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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: