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:
另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。
成都创新互联公司是一家专业提供
华宁企业网站建设,专注与
成都网站制作、网站设计、
HTML5、小程序制作等业务。10年已为华宁众多企业、政府机构等服务。创新互联专业网站建设公司优惠进行中。
标题名称：IS-ISPackets-创新互联
文章来源：
http://cdxtjz.cn/article/ccepdh.html
