User Manual

OSPF and OSPFv3
443
M6100, M5300, and M7100 Series Managed Switches
The following table describes the nonconfigurable data that is displayed.
Table 164. Advanced OSPFv3 Link State Database
Field Description
Router ID The 32-bit integer in dotted-decimal format that uniquely identifies the
router within the autonomous system (AS). The router ID is set on the
OSPFv3 Configuration screen. To change the router ID you must first
disable OSPFv3. After you set the new router ID, you must reenable
OSPFv3 for the change to take effect. The default value is 0.0.0.0,
although this is not a valid router ID.
Area ID The ID of an OSPFv3 area to which one of the router interfaces is
connected. An area ID is a 32-bit integer in dotted-decimal format that
uniquely identifies the area to which an interface is connected.
LSA Type The format and function of the link state advertisement. LSA Type is
one of the following:
• Router LSA. A router can 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-area prefix lsas to advertise the link's prefixes
throughout the area. A router can 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.