June 2004
Intermediate to advanced
840 pages
39h 47m
English
Content preview from The Internet and Its Protocols
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184 Chapter5 Routing
without leaving the L2 area, that is, without entering an L1 area or leaving
the AS. Only L2 routers may support external links to other ASs.
L1 routers know only about routes within their own area, but maintain a
default route to the L1/L2 ABR for all external addresses. The L1/L2 routers
have some knowledge of routes outside the area so that they can choose the
best attached L2 router. Within the L2 area, the routers have knowledge of the
connectivity and routes within the area and know about all of the attached L1/L2
routers. In this way, IS-IS areas are ...
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