From: John Conzone (jkconzone@xxxxxxxx)
Date: Mon Aug 21 2000 - 18:22:33 GMT-3
Need some help with NLSP area and route aggregation. Excerpt from
doc CD.
Area Addresses
An area address uniquely identifies an NLSP area. The area addresses
configured on each router determine the areas to which a router
belongs.
An area address consists of a pair of 32-bit hexadecimal numbers that
include an area number and a corresponding mask. The mask indicates
how much of the area number identifies the area, and how much
identifies individual networks in the area. For example, the area
address pair 12345600FFFFFF00 describes an area composed of 256
networks in the range 12345600 to 123456FF.
I'm okay with this I think. We're masking the first 24 bits, and don't
care on the last 8. 8 bits for networks and possible 256 networks. The
next paragraph describes route summarie, which make sense. They follow
the area address format. Now the next part is where I lose it. Here it
is.
Aggregated Routes
An aggregated route is the single, compact data structure that describes
many IPX network numbers simultaneously. The aggregated route represents all
the explicit routes defined by the route summary. In an LSP, the router
expresses an aggregated route as a 1-byte number that gives the length, in
bits, of the portion of the 32-bit network number common to all summarized
addresses. The aggregated route for 12345600FFFFFF00 is 18 12345600.
The must match bits equal 24, not 18. Hence i would expect 24 12345600, not
18 12345600. What am I missing?
Thanks!
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