ZXR10 5900E Series Configuration Guide (IPv6)
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To process the router LSA during SPF computation, two flag bits R and V6 are
added to the options field. The OSPF header contains an Instance ID, thus
allowing the running of multiple OSPF protocol instances over a single link.
LSA Types
An LSA is the unit to construct the OSPFv3 link state database. A router uses LSAs to
form a complete network topology and further generate a routing table. OSPFv3 has the
following types of LSAs.
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Router LSA
Its link state type is 0x2001. It can generate one or multiple LSAs on each router
within an area.
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Network LSA
Its link state type is 0x2002. It can generate network LSAs for each broadcast and
NBMA link within an area, which supports two or multiple routers. Network LSAs are
created by DR on this link.
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Inter-Area Prefix LSA
Its link state type is 0x2003. It is equivalent to the Type-3 LSA in OSPFv2. Created by
an area border router, the inter-area prefix router LSA describes IPv6 address prefixes
in other areas. For stub areas, inter-area prefix LSA can also be used to describe the
default route.
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Inter-Area Router LSA
Its link state type is 0x2004. It is equivalent to the Type-4 LSA in IPv4. Created by the
ABR, it describes the ASBR to other areas.
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AS External LSA
Its link state type is 0x4005. It is created by the ASBR and describes the ASBR to
other areas.
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Link LSA
Its link state type is 0x0008. A router advertises a separate link LSA to each link
connecting with it. These LSAs have a local link flooding range and will not be flooded
out of the related link.
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Intra-Area Prefix LSA
Its link state type is 0x2009. A router uses the intra-area prefix LSA to advertise
one or multiple IPv6 address prefixes, which are associated with the router itself, the
connected stub network segment or the connected transit network segment.
Two types of LSAs are added to OSPFv3. They are the Link LSA and the Intra Area Prefix
LSA.
describes the brief similarities and differences between OSPFv3 LSAs and
OSPFv2 LSAs.
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