OSPF and OSPFv3
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M4300 Series and M4300-96X Fully Managed Switches User Manual
The following table describes the nonconfigurable information that is displayed.
Table 133. OSPF 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
IP Configuration page.
To change the router ID you must first disable
OSPF. After you set the new router ID, you must reenable OSPF 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 OSPF 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 T
ype The format and function of the link state advertisement. LSA Type is
one of the following:
• Illegal
• Router Links
• Network Links
• Network Summary
• ASBR Summary
• AS-external
• Group Member
• NSSA
• TMP2
• Link Opaque
• Area Opaque
• AS Opaque
• Unknown
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.
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