D-Link DES-3350SR User Manual page 120

Options
Link State Type
Link State ID
Advertising Router
Link State Sequence
Number
Link State Checksum
Length
Router Links Advertisements
Router links advertisements are type 1 link state advertisements. Each router in an area originates a routers links advertisement.
The advertisement describes the state and cost of the router's links to the area. All of the router's links to the area must be
described in a single router links advertisement.
The format of the Router Links Advertisement is shown below:
In router links advertisements, the Link State ID field is set to the router's OSPF Router ID. The T - bit is set in the advertisement's
Option field if and only if the router is able to calculate a separate set of routes for each IP Type of Service (TOS). Router links
advertisements are flooded throughout a single area only.
Field
D-Link DES-3350SR Standalone Layer 3 Switch
The optional capabilities supported by the described portion of the
routing domain.
The type of the link state advertisement. Each link state type has a
separate advertisement format.
The link state type are as follows: Router Links, Network Links,
Summary Link (IP Network), Summary Link (ASBR), AS External Link.
This field identifies the portion of the internet environment that is being
described by the advertisement. The contents of this field depend on the
advertisement's Link State Type.
The Router ID of the router that originated the Link State Advertisement.
For example, in network links advertisements this field is set to the Router
ID of the network's Designated Router.
Detects old or duplicate link state advertisements. Successive instances
of a link state advertisement are given successive Link State Sequence
numbers.
The Fletcher checksum of the complete contents of the link state
advertisement, including the link state advertisement header by accepting
the Link State Age field.
The length in bytes of the link state advertisement. This includes the 20-
byte link state advertisement header.
Routers Links Advertisements
Link-State Age
Link-State Sequence Number
Link-State Checksum
V E B
Reserved Reserved
Type No. Of TOS
TOS
0
0
TOS
Figure 9 - 23. Routers Links Advertisements
Description
Options
Link-State ID
Advertising Router
Length
Number of Links
Link ID
Link Data
TOS 0 Metric
...
Metric
...
Link ID
Link Data
110
Link-State Type
Metric