H3C S9500 Series Operation Manual page 282

Operation Manual – Routing Protocol
H3C S9500 Series Routing Switches
II. LSP
Link state packet (LSP) can switch link state information. LSP can be divided into
Level-1 LSP and Level-2 LSP. Level-2 routers transmit Level-2 LSPs; Level-1 routers
transmit Level-1 LSPs; Level-1-2 routers transmit both Level-2 LSPs and Level-1
LSPs.
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.
5.2 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
Enabling IS-IS and Entering the IS-IS View
Setting Network Entity Title
Enabling IS-IS on the Specified Interface
Setting Priority for DIS Election
Setting Router Type
Setting Interface Circuit Level
2) Configuration related to IS-IS route
Configuring IS-IS to Import Routes of Other Protocols
Configuring IS-IS Route Filtering
Configuring IS-IS Routing Leak
Setting IS-IS Route Summary
Setting to Generate Default Route
3) Default route generation
Setting the Preference of IS-IS Protocol
Configuring IS-IS Route Metric Type
Setting IS-IS Link State Routing Cost
Chapter 5 Integrated IS-IS Configuration
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