Netgear M4300-12X12F (XSM4324S) - Stackable Managed Switch with 24x10G including 12x10GBASE-T and 12xSFP+ Layer 3 User Manual

The following table describes the nonconfigurable data that is displayed in the External Link 
State Database (LSDB) table.

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.

Options

The Options field in the link state advertisement header indicates which 
optional capabilities are associated with the advertisement. The options 
are as follows:

. This enables support for QoS traffic engineering.

. This describes the way AS-external LSAs are flooded.

. This describes the way IP multicast datagrams are forwarded 

according to the standard specifications.

. This describes whether opaque LSAs are supported.

. This describes whether OSPF++ extensions for VPN/COS are 

supported. 

Router Options

The router-specific options.

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:

. 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.

. 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.