OSPF and OSPFv3
398
M4300 Series and M4300-96X Fully Managed Switches User Manual
The following table describes the nonconfigurable information that is displayed in the
External Link State Database (LSDB) table.
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.
Options The Options field in the link state advertisement header indicates which
optional capabilities are associated with the advertisement.
The options are
as follows:
• Q
. This
enables
support for QoS traffic engineering.
• E. This describes the way AS-external LSAs are flooded.
• MC. This describes the way IP multicast datagrams are forwarded
according to the standard specifications.
• O
.
This describes whether opaque LSAs are supported.
• V. This describes whether OSPF++ extensions for VPN/COS are
supported.
Router Options The router-specific options.
Table 146. Advanced OSPFv3 External Link State Database Table
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 page.
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.
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.
Table 145. Advanced OSPFv3 Link State Database (continued)
Field Description
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