3Com DUA1750-2BAA01 20.2 Configuring Integrated IS-IS

3Com Switch 8800 Configuration Guide Chapter 20 Integrated IS-IS Configuration
20-6
III. SNP
Sequence Number Packet (SNP) can confirm the LSPs last received from neighbors.
SNPs function as acknowledge packets, but SNPs function more validly. SNP includes
complete SNP (CSNP) and partial SNP (PSNP). SNP can be further divided into
Level-1 CSNP, Level-2 CSNP, Level-1 PSNP and Level-2 PSNP.
PSNP only lists one or more last received LSP sequence numbers, and confirms
multiple LSPs. When detecting asynchronous LSDBs, the system asks neighbors to
send new LSPs by PSNPs.
CSNP contains all LSP digest information in a LSDB, synchronizing LSDBs for
neighbor routers. On a broadcast network, a DIS sends CSNPs periodically (the default
sending period is 10 seconds). On the point-to-point line, a DIS sends CSNPs only
when the neighbors are established for the first time.
20.2 Configuring Integrated IS-IS
Among the following configurations, the configuration of enabling integrated IS-IS is
required, while other configurations are optional.
IS-IS configuration includes:
1) IS-IS basic configuration
z Enabling IS-IS and Entering the IS-IS View
z Setting Network Entity Title
z