Huawei Quidway S6500 Series Operation Manual page 205

Operation Manual - Routing Protocol
Quidway S6500 Series Ethernet Switches
NSAP Selector (SEL) of 8 bits does not select routes but equals the protocol identifier
of IP. Different transmission protocols correspond to different identifiers. All the SELs of
IP are 00.
AFI+IDI+HO-DSP+System ID composes the Network Entity Title, or NET for short,
which indicates the area address and system ID for routing. ID should be unique inside
the whole area and on the backbone (Level-2).
For example, there is a NET 47.0001.aaaa.bbbb.cccc.00, in which,
Area=47.0001, System ID=aaaa.bbbb.cccc, SEL=00.
For example, there is a NET 01.1111.2222.4444.00, in which,
Area=01, System ID=1111.2222.4444, and SEL=00.
5.1.4 IS-IS Routing Protocol Packets
IS-IS packets are directly encapsulated in the data link frames and mainly divided into 4
kinds, IIH, LSP, CSNP, and PSNP.
Intermediate System to Intermediate System Hello PDU (IIH). It is transmitted
regularly to detect if the contiguous system is running IS-IS so as to establish
adjacency and switch Link State Packet (LSP), thereby implementing LSDB
synchronization.
Link State Packet (LSP). It is used for propagating link state records throughout
the area. LSP includes Level-1 LSP and Level-2 LSP.Level-2 LSP contains the
information about all the reachable areas. Level-1 LSP is only used for local area.
Complete Sequence Numbers Packet (CSNP). CSNP includes Level-1 CSNP and
Level-2 CSNP. CSNP is used for database synchronization. The DIS is transmitted
(every 10 seconds by default) regularly on the broadcast network. Over the p2p
serial line, the CSNP is transmitted only when the adjacent relationship is
established for the first time.
Partial Sequence Numbers Packet (PSNP). PSNP includes Level-1 PSNP and
Level-2 PSNP.PSNP is also applied to the database synchronization. Over the
p2p link, the routers transmit PSNP as Ack response to acknowledge the receipt
of a certain LSP. The router requests the neighbor for the latest LSP. If it finds the
received CSNP missed some database (or the original database is older), it will
transmit PSNP for a new LSP.
For more information, refer to relevant documentation, such as ISO 10589.
5.2 Configure Integrated IS-IS
Among the following configurations, the "Enable IS-IS" is required, while other
configurations are optional.
Huawei Technologies Proprietary
5-4
Chapter 5 Integrated IS-IS Configuration