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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  TCP/IP Routing Protocols (Gateway Protocols)
                9  TCP/IP Interior Routing Protocols (RIP, OSPF, GGP, HELLO, IGRP, EIGRP)
                     9  Open Shortest Path First (OSPF)

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OSPF General Operation and Message Types
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 Other Interior Routing Protocols
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OSPF Message Formats
(Page 4 of 7)

Link State Request Message Format

These messages have a Type value of 3 in the header. Following the header comes one or more sets of three fields that each identify a link state advertisement (LSA) for which the router is requesting an update, as shown in Figure 187. Each LSA identification has the format described in Table 129.


Table 129: OSPF Link State Request Message Format

Field Name

Size (bytes)

Description

LS Type

4

Link State Type: The type of link state advertisement (LSA) being sought.

Link State ID

4

Link State ID: The identifier of the LSA, usually the IP address of either the router or network linked.

Advertising Router

4

Advertising Router: The ID of the router that created the LSA whose update is being sought.


Figure 187: OSPF Link State Request Message Format

 

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