D-Link DES-3326SR Manual page 178

24-port layer 3 stackable switch with optional rps support
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The Link State Advertisement Header
All link state advertisements begin with a common 20-byte header. This header contains enough information to
uniquely identify the advertisements (Link State Type, Link State ID, and Advertising Router). Multiple
instances of the link state advertisement may exist in the routing domain at the same time. It is then necessary to
determine which instance is more recent. This is accomplished by examining the link state age, link state
sequence number and link state checksum fields that are also contained in the link state advertisement header.
The format of the Link State Advertisement Header is shown below:
Table 8. Link-State Advertisement Header
Field
Link State Age
Options
Link State Type
Link State ID
Advertising Router
Link State Sequence
Number
Link State Checksum
Length
D-Link DES-3326SR Layer 3 Switch
Link-State Advertisement Header
Link-State Age
Link-State ID
Advertising Router
Link-State Sequence Number
Link-State Checksum
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 type are as
follows:
Type
Description
1
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
excepting 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
168
Link-State Type

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