thanks for the many people answering.
I learned the following:
a) turning off the fast cache on a Cisco Router with two 2 MBit
serial lines puts too much load on the CPU and isn't suggested.
b) The routing protocol only fills the routing table with
two paths for the destination router / network. How the
packets travel to the dstination network is a matter of
the router operating system (IOS)...
c) If the first packet arrives on the source router (the one
who sits on the backbone from which two equal-cost paths
lead to the destination router) the router doesn't find an
entry in the fast cache and has to look up the routing-table.
When finding a route it makes a "random" decision, which path
to use, transmits the packet and makes an entry in the fast cache.
d) the entry of the fast cache usually has a lifetime of about 10-15
seconds. Subsequent packets will choose the path which is
in the fast cache which, and the fast cache will life for another
e) If no subsequent packets arrive the fast-cache times out.
If a new packet arrives for the destination it starts again
So my initial question wasn't correct, assuming the routing protocol
had something to do with the transport through path 1 or 2 ...
I thought I should give you something back, after increasing my
learning courve ;-)
Andreas Klemm http://www.FreeBSD.ORG/~andreas
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