Router Links Advertisements - D-Link DGS-3600 Series User Manual
Layer 3 gigabit ethernet managed switch
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Field
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:
®
xStack
DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
Link-State Advertisement Header
Link-State Age
Advertising Router
Link-State Sequence Number
Link-State Checksum
Figure 8- 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
Link-State ID
Length
187
Link-State Type
Advertisement
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