In ISO terminology, packets are referred to as
Protocol Data Units (PDUs). There are 3 categories of IS-IS packets:
- IS-IS Hello Packets (IIHs): These packets establish and maintain adjacencies between IS-IS neighbors.
- Link State PDUs (LSPs): These packets are responsible to distribute routing information between IS-IS nodes.
- Sequence Number PDUs (SNPs): These packets control the distribution of LSPs. SNPs provide mechanism to synchronize LSDBs between routers in the same area.
Each packet category consists of various types of packets; each type is assigned a Type Number. All IS-IS packets are multicast on LAN. For Level-1 ISs, the packets are sent to
01-80-C2-00-00-14, and for Level-2 ISs, the packets are sent to
01-80-C2-00-00-15.
The following table shows IS-IS packet types:
Category
| Packet Type
| Type Number
|
Hello
| LAN Level-1 Hello
| 15 |
| | LAN Level-2 Hello
| 16 |
| | Point-to-point Hello
| 17 |
| LSP | Level-1 LSP
| 18 |
| | Level-2 LSP
| 20 |
| SNP | Level-1 Complete SNP
| 24 |
| | Level-2 Complete SNP
| 25 |
| | Level-1 Partial SNP
| 26 |
| | Level-2 Partial SNP
| 27 |
Generic IS-IS Packet Header Each IS-IS PDU mentioned in above table has an 8-byte header. The following packet capture shows the basic format:
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