D-Link xStack DES-3800 Series User Manual page 144

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.
Field
V - bit
E - bit
B - bit
Number of Links
The following fields are used to describe each router link. Each router link is typed. The Type field
indicates the kind of link being described. It may be a link to a transit network, to another router or to
xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
Routers Links Advertisements
Link-State Age
Link-State Checksum
V E B
Reserved Reserved
Type No. Of TOS
TOS
TOS
Figure 8- 23. Routers Links Advertisements
Description
When set, the router is an endpoint of an active virtual link that is
using the described area as a Transit area (V is for Virtual link
endpoint).
When set, the router is an Autonomous System (AS) boundary
router (E is for External).
When set, the router is an area border router (B is for Border).
The number of router links described by this advertisement. This
must be the total collection of router links to the area.
Options
Link-State ID
Advertising Router
Link-State Sequence Number
Number of Links
Link ID
Link Data
TOS 0 Metric
0
...
0
...
Link ID
Link Data
128
Link-State Type
Length
Metric
Metric