D-Link DES-3326S User Manual page 162

Table 5-23. Network Link Advertisement
Summary Link Advertisements
Summary link advertisements are Type 3 and 4 link state
advertisements. These advertisements are originated by Area
Border routers.
made for each destination known to the router, that belongs to
the Autonomous System (AS), yet is outside the area.
Type 3 link state advertisements are used when the destination
is an IP network. In this case the advertisement's Link State ID
field is an IP network number. When the destination is an AS
boundary router, a Type 4 advertisement is used, and the Link
State ID field is the AS boundary router's OSPF Router ID.
Other that the difference in the Link State ID field, the format
of Type 3 and 4 link state advertisements is identical.
Summary Link Advertisement
TOS
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DES-3326S Layer 3 Fast Ethernet Switch User's Guide
A separate summary link advertisement is
Link-State Age
Link-State ID
Advertising Router
Link-State Sequence Nu
Link-State Checksum
Network Mask
Switch Management and Operating Concepts
adjacent to
Designated Router (DR)
are listed.
includes itself in this list.
s
Optio ns
mber
Length
Metric
the
The DR
2