October 2002
Intermediate to advanced
344 pages
10h 17m
English
Content preview from The ABCs of TCP/IP, 2nd Edition
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180
The ABCs of TCP/IP
with the use of an IP address, the information in a router’s Link State
Advertisement consists of an IP address–cost metric pair. Exhibit 13 lists the
six types of SLA messages that OSPF routers use.
Type 2 Message
The purpose of a Type 2 LSA message is to inform all routers within an area
of the presence of a designated router (DR). Thus, a DR floods a Type 2 LSA
upon its election. This message contains information about all routers in the
area, as well as the fact that one is now the DR for the area.
Type 3 Message
Because an area border router (BR) connects adjacent areas, a mechanism
is needed to describe networks reachable via the adjacent border router
(ABR). Thus, an ABR router floods a Type 3 message into an area to ...
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