D-Link DGS-3312SR [156/290] State advertisement header

D-Link DGS-3312SR [156/290] State advertisement header
DGS-3312SR Stackable Gigabit Layer 3 Switch
Link
-State Advertisement Header
Link-State ID
Advertisin Router
umber
hecksum
Length
Link-State Age
Options Link-State Type
g
Link-State Sequence N
Link-State C
Field
Figure 5- 25. Link-State Advertisement Header
Description
Link State Age
The time is seconds since the link state advertisement was
originated.
Options
The optional capabilities supported by the described portion of
Link State Type
as
a separate advertisement format. The link state type are as
Description
1 Router Links
Network Links
Summary Link (IP Network)
escribed by the advertisement. The contents of this field
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
excepting the Link State Age field.
Length
The length in bytes of the link state advertisement. This includes
the 20-byte link state advertisement header.
the routing domain.
The type of the link state advertisement. Each link state type h
follows:
Type
Summary Link (ASBR)
AS External Link
Link State ID
This field identifies the portion of the internet environment that is
being d
depend on the advertisement’s Link State Type.
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