DXS-3326GSR Gigabit Layer 3 Switch
depend on the advertisement’s Link State Type.
Advertising Router 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.
Link State Sequence Number Detects old or duplicate link state advertisements. Successive
instances of a link state advertisement are given successive Link
State Sequence numbers.
Link State Checksum 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.
Length The length in bytes of the link state advertisement. This includes
the 20-byte link state advertisement header.
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:
Link-State Age
Options Link-State Type
Link-State ID
Advertising Router
Link-State Sequence Number
Link-State Checksum
Length
Routers Links Advertisements
Reserved Reserved Number of Links
Link ID
Link Data
Type No. Of TOS TOS 0 Metric
TOS
Metric
...
TOS
Metric
...
Link ID
Link Data
0
0
VBE
Figure 7- 25. Routers Links Advertisements
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