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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
156 Switch Management and Operating Concepts
Link-State Age
Optio
Link-State ID
Advertising Router
Link-State Sequence Num
Link-State Checksum
Routers Links Advertisemen
Reserved Reserved N
Link ID
Link Data
Type No. Of TOS
TOS
...
TOS
...
Link ID
Link Data
0
0
VBE
ns Link-State Type
ber
Length
ts
umber of Links
TOS 0 Metric
Metric
Metric
Figure 5-29. Routers Links Advertisement
In router links advertisements, the Link State ID field is set to
the router’s OSPF Router ID. The T – bit is set in the
advertisement’s Option field if and only if the router is able to
calculate a separate set of routes for each IP Type of Service
(TOS). Router links advertisements are flooded throughout a
single area only.