D-Link xStack DGS-3120 Series Reference Manual page 200

xStack® DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch Web UI Reference Guide
Parameter
Link State Age
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:
Link-State Advertisement Header
Link-State Age
Link-State ID
Advertising Router
Link-State Sequence Number
Link-State Checksum
Figure 5-37 Link State Advertisement Header
Description
The time is seconds since the link state advertisement was originated.
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 types 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.
Options
Length
190
Link-State Type