November 2005
Intermediate to advanced
480 pages
13h 38m
English
Content preview from OSPF and IS-IS: Choosing an IGP for Large-Scale Networks
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3.4. Message Types
OSPF uses five message types:
Hello
Database Description (DD)
Link State Request
Link State Acknowledgement
Link State Update
IS-IS uses four basic message types:
IS-IS Hello (IIH)
Complete Sequence Number PDU (CSNP)
Partial Sequence Number PDU (PSNP)
Link State PDU (LSP)
Unlike OSPF, IS-IS messages have subtypes. There are LAN and Point-to-Point Hellos, used as the names imply on either broadcast or point-to-point media. The LAN Hellos are also subdivided into level 1 and level 2 types and are sent over level 1 and level 2 adjacencies. Likewise, Sequence Number PDUs (CSNPs and PSNPs) and LSPs are also subdivided into level 1 and level 2 types. So although there are only four basic types of IS-IS messages, when divided by function, ...
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