IS-ISPackets-创新互联
In ISO terminology, packets are referred to as Protocol Data Units (PDUs). There are 3 categories of IS-IS packets:
The following table shows IS-IS packet types:
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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- 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.
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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