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Chapter 4. Routing | 319
ProSafe® Gigabit L3 Managed Stackable Switches Software Administration Manual
LSA Type The format and function of the link state
advertisement. One of the following:
• Router LSA: A router may originate one or more
router-lsas for a given area. Each router-lsa
originated in an area describes the collected states
of all the router's interfaces to the area.
• Network LSA: A network lsa is originated for
every link having two or more attached routers, by
the designated router. It lists all the routers
attached to the link.
• Inter-Area Router LSA: This type describes a
prefix external to the area, yet internal to the
autonomous system. It is originated by an Area
Border Router.
• AS-External LSA: This LSA type describes a path
to a prefix external to the autonomous system and
is originated by an Autonomous System Border
Router.
• Link LSA: A router originates a separate Link-lsa
for each attached link. It provides router's link local
address to routers attached to the link and also
inform them of a list of IPv6 prefixes to associate
with the link.
• Intra-Area-Prefix LSA: A link's designated router
originates one or more intra-areaprefix lsas to
advertise the link's prefixes throughout the area. A
router may originate multiple intra-area-prefix lsas
for a given area to advertise its own prefixes and
those of its attached stub links.
LS ID The Link State ID identifies the piece of the routing
domain that is being described by the advertisement.
The value of the LS ID depends on the
advertisement's LS type.
Age The time since the link state advertisement was first
originated, in seconds.
Sequence The sequence number field is a signed 32-bit integer.
It is used to detect old and duplicate link state
advertisements. The larger the sequence number,
the more recent the advertisement.
Checksum The checksum is used to detect data corruption of an
advertisement. This corruption can occur while an
advertisement is being flooded, or while it is being
held in a router's memory. This field is the checksum
of the complete contents of the advertisement,
except the LS age field.
Table 44.
Field Description
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