Lsa Types - Zte ZXR10 5900E Series User Manual

Optional fields of Hello message and database description
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message expands to 24 bits.
Authentication and authentication type fields are deleted
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from OSPF header.
Hello message does not contain address semantics. It con-
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tains an interface ID that is used to identify the links on this
router. If the router becomes the DR on the link, the inter-
face ID will be the link state ID of the network LSA.
To process router LSAs during SPF calculation, two option
�
flag fields of R and V6 are added to option field. OSPF
header contains an Instance ID, which allows running mul-
tiple OSPF protocol instances over a single link.
� LSA format is changed in OSPFv3.
All address semantics are deleted from LSA header, router LSA
and network LSA. Router LSA and network
topology of routing area in a way independent of network pro-
tocols. New LSA that is used to allocate IPv6 address informa-
tion and the data that is required for next hop resolution are
added.
Type-3 LSA is renamed intra-area prefix LSA and Type-4 LSA
is renamed intra-area router LSA.
� OSPFv3 and OSPFv2 process unknown types of LSAs differ-
ently.
In OSPFv3, unknown types of LSAs can be regarded as having
link-local flooding range, or be regarded as the known LSA type
to be saved and flooded. IPv4 OSPF discards unknown types
of LSAs.
� OSPFv3 supports stub area.
In OSPFv3, routers in stub area can only process router LSA,
network LSA and intra-area prefix LSA. These routers allow
unknown types of LSAs to be saved and flooded as known LSAs.
� In OSPFv3, router uses router ID identify neighbor.
In OSPFv3, neighbor routers on a designated link are identi-
fied by router IDs. In IPv4 OSPF, neighbors on point-to-point
networks and virtual links are identified by their router IDs.
Neighbors on broadcast, NBMA and point-to-multipoint links
are identified by interface ID.

LSA Types

An LSA is the basic unit of OSPFv3 link state database. Routers
use LSAs to sets up a complete network topology and generate a
routing table. OSPFv3 has the following types of LSAs:
� Router LSA
The LS type of this LSA is 0x2001. It can generate one or
multiple LSAs on each router within an area.
�
Network LSA
Confidential and Proprietary Information of ZTE CORPORATION
Chapter 6 OSPFv3 Configuration
LSA describe the
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